Search for Articles:
Title / Keyword
Author / Affiliation / Email
Journal
Article Type
 
 
Advanced Search
 
Section
Special Issue
Volume
Issue
Number
Page
 
4.5
2.7
Journals
Applied Sciences
Special Issues
Antenna Design for Microwave and Millimeter Wave Applications: Latest Advances...
share announcement

Antenna Design for Microwave and Millimeter Wave Applications: Latest Advances and Prospects

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Electrical, Electronics and Communications Engineering".

Deadline for manuscript submissions: closed (28 February 2021) | Viewed by 43542

Special Issue Editor

Prof. Dr. Hosung Choo

E-Mail Website
Guest Editor
School of Electronic and Electrical Engineering, Hongik University, Seoul 04066, Republic of Korea
Interests: electrically small antennas for wireless communications; reader and tag antennas for RFID; on-glass and conformal antennas for vehicles and aircraft; array antennas for GPS applications
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear colleagues,

Until recently, substantial effort has been devoted to new approaches and attempts to the design of antennas for microwave and millimeter-wave applications. For example, advanced technologies such as antenna miniaturization, array optimization, and bandwidth enhancement have been extensively studied over a decade, and are being applied to commercial applications such as 4G/5G mobile communications, autonomous driving, or military applications including radar, direction finding, and anti-jamming.

However, as these technologies are recently employed in small mobile devices, the size and geometry of the antennas are more limited in order to be mounted in a more compact space with better radiation performances. Accordingly, advanced antenna designs using novel approaches to this issue are required in various aspects.

This Special Issue aims to collect relevant papers describing the latest advances and prospects in antenna design for microwave and millimeter-wave applications.

The fields of interest for this Special Issue include, but are not limited to, design methods of antennas such as miniaturization, optimization, and array. You are cordially invited to submit a contribution of either an original research or a review article to this Special Issue.

Prof. Dr. Hosung Choo
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Applied Sciences is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • antenna design and optimization
  • antenna arrays
  • 5G communications
  • antenna measurement
  • manufacturing methods
  • miniaturized microwave and millimeter-wave antenna
  • radio propagation
  • automotive antennas
  • radar antennas

Published Papers (15 papers)

Download All Papers
Order results
Result details
Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:

Editorial

Jump to: Research, Other

6 pages, 190 KiB  
Editorial
Antenna Design for Microwave and Millimeter Wave Applications: Latest Advances and Prospects
by Hosung Choo
Appl. Sci. 2021, 11(12), 5556; https://doi.org/10.3390/app11125556 - 16 Jun 2021
Cited by 2 | Viewed by 1832
Abstract
Until recently, substantial effort has been devoted to new approaches and attempts to the design of antennas for microwave and millimeter-wave applications [...] Full article
(This article belongs to the Special Issue Antenna Design for Microwave and Millimeter Wave Applications: Latest Advances and Prospects)

Research

Jump to: Editorial, Other

7 pages, 19242 KiB  
Article
A Low Profile Dual-Band High Gain Directional Antenna for Anti-Interference WLAN Station Applications
by Yuqing Dou, Guiting Dong, Jiafu Lin, Qibo Cai and Gui Liu
Appl. Sci. 2021, 11(5), 2007; https://doi.org/10.3390/app11052007 - 24 Feb 2021
Cited by 5 | Viewed by 2299
Abstract
This paper presents a low-profile dual-band antenna with directional radiation characteristics for wireless local area network (WLAN) applications. The proposed directional antenna is composed of a coupling microstrip line, two F-shaped strips, two rectangular strips, and a defected ground plane. The measured impedance [...] Read more.
This paper presents a low-profile dual-band antenna with directional radiation characteristics for wireless local area network (WLAN) applications. The proposed directional antenna is composed of a coupling microstrip line, two F-shaped strips, two rectangular strips, and a defected ground plane. The measured impedance bandwidth of the proposed antenna is 180 MHz (2.33–2.51 GHz) and 830 MHz (5.09–5.92 GHz), which can cover Institute of Electrical and Electronic Engineers (IEEE) 802.11 a/b/g frequency bands. The dual-band antenna exhibits a desirable directional radiation patterns in the vertical and horizontal planes with the peak gain of 6.55 dBi in the lower frequency band and 8.1 dBi in the higher frequency band. The measured antenna efficiency is 70% at 2.4 GHz and 84.5% at 5.5 GHz. The proposed dual-band WLAN station antenna is designed on a FR4 substrate with overall dimensions of 69 mm × 50 mm × 1.6 mm. Full article
(This article belongs to the Special Issue Antenna Design for Microwave and Millimeter Wave Applications: Latest Advances and Prospects)
►▼ Show Figures

Figure 1

10 pages, 3966 KiB  
Article
Wheeler Method for Evaluation of Antennas Submerged in Lossy Media
by Yerim Oh, Dongkwon Choi, Jae-Yeong Lee and Wonbin Hong
Appl. Sci. 2021, 11(4), 1862; https://doi.org/10.3390/app11041862 - 20 Feb 2021
Cited by 1 | Viewed by 2061
Abstract
A Wheeler method for the evaluation of the radiation efficiency of submerged antennas within lossy media is presented and demonstrated for the first time in the literature. Extensive investigations have been devised by empirical and simulation methods. Normal-mode helical antenna (NMHA) was first [...] Read more.
A Wheeler method for the evaluation of the radiation efficiency of submerged antennas within lossy media is presented and demonstrated for the first time in the literature. Extensive investigations have been devised by empirical and simulation methods. Normal-mode helical antenna (NMHA) was first designed and fabricated to exemplify a real-life application at the UHF band (0.3 to 3 GHz). The antenna under test (AUT) was evaluated within an artificial lossy material using a series of Wheeler caps featuring different radii to study the validity of this method. The error between the experimental and simulation radiation efficiency is below 3% near the theoretical radian length. The presented measurement method of radiation efficiency without any essential measurement facilities or accessories could be a promising candidate for fast and accurate evaluation for any wire-type antenna submerged within lossy media. Full article
(This article belongs to the Special Issue Antenna Design for Microwave and Millimeter Wave Applications: Latest Advances and Prospects)
►▼ Show Figures

Figure 1

14 pages, 4359 KiB  
Article
Prediction of Wide Range Two-Dimensional Refractivity Using an IDW Interpolation Method from High-Altitude Refractivity Data of Multiple Meteorological Observatories
by Sungsik Wang, Tae Heung Lim, Kyoungsoo Oh, Chulhun Seo and Hosung Choo
Appl. Sci. 2021, 11(4), 1431; https://doi.org/10.3390/app11041431 - 5 Feb 2021
Cited by 3 | Viewed by 1762
Abstract
This article proposes a method for the prediction of wide range two-dimensional refractivity for synthetic aperture radar (SAR) applications, using an inverse distance weighted (IDW) interpolation of high-altitude radio refractivity data from multiple meteorological observatories. The radio refractivity is extracted from an atmospheric [...] Read more.
This article proposes a method for the prediction of wide range two-dimensional refractivity for synthetic aperture radar (SAR) applications, using an inverse distance weighted (IDW) interpolation of high-altitude radio refractivity data from multiple meteorological observatories. The radio refractivity is extracted from an atmospheric data set of twenty meteorological observatories around the Korean Peninsula along a given altitude. Then, from the sparse refractive data, the two-dimensional regional radio refractivity of the entire Korean Peninsula is derived using the IDW interpolation, in consideration of the curvature of the Earth. The refractivities of the four seasons in 2019 are derived at the locations of seven meteorological observatories within the Korean Peninsula, using the refractivity data from the other nineteen observatories. The atmospheric refractivities on 15 February 2019 are then evaluated across the entire Korean Peninsula, using the atmospheric data collected from the twenty meteorological observatories. We found that the proposed IDW interpolation has the lowest average, the lowest average root-mean-square error (RMSE) of ∇M (gradient of M), and more continuous results than other methods. To compare the resulting IDW refractivity interpolation for airborne SAR applications, all the propagation path losses across Pohang and Heuksando are obtained using the standard atmospheric condition of ∇M = 118 and the observation-based interpolated atmospheric conditions on 15 February 2019. On the terrain surface ranging from 90 km to 190 km, the average path losses in the standard and derived conditions are 179.7 dB and 182.1 dB, respectively. Finally, based on the air-to-ground scenario in the SAR application, two-dimensional illuminated field intensities on the terrain surface are illustrated. Full article
(This article belongs to the Special Issue Antenna Design for Microwave and Millimeter Wave Applications: Latest Advances and Prospects)
►▼ Show Figures

Figure 1

8 pages, 3754 KiB  
Article
Inverted F Type Antenna Design for the Cattle Activity and Estrus Detection Sensor Module
by Youchung Chung
Appl. Sci. 2021, 11(1), 298; https://doi.org/10.3390/app11010298 - 30 Dec 2020
Cited by 2 | Viewed by 2461
Abstract
In this paper, an inverted F type antenna (IFA) for ZigBee communication of a sensor board has been designed and optimized, and it replaces the chip antenna on an RF (Radio Frequency) module that is not performing well enough for the ZigBee communication. [...] Read more.
In this paper, an inverted F type antenna (IFA) for ZigBee communication of a sensor board has been designed and optimized, and it replaces the chip antenna on an RF (Radio Frequency) module that is not performing well enough for the ZigBee communication. The sensor board detects cattle behavior and identifies the breeding (estrus) period and transmits the data to the main station by the RF (Radio Frequency) module and IFA antenna. The proposed and optimized TRx (transmitting/receiving) IFA antenna of the ZigBee communication module has a return loss of −19 dB and a gain of 1.6 dB at 2.45 GHz. The size is about 2.5 × 0.5 cm in width and vertical length, and the height is 0.55 cm. The strength of signals with the chip antenna and the IFA antenna have been measured and compared. There is about a 20 dB enhancement with the IFA antenna compared to the chip antenna. The antenna is designed and applied to the RF transmission and reception (TRx) module. This antenna and sensor module can be applied to livestock in general as well as cattle. Full article
(This article belongs to the Special Issue Antenna Design for Microwave and Millimeter Wave Applications: Latest Advances and Prospects)
►▼ Show Figures

Figure 1

11 pages, 2122 KiB  
Article
Low-Profile Spidron Fractal Dipole Antenna with a Ferrite-Loaded Artificial Magnetic Conductor for Manpack Applications
by Oh Heon Kwon and Keum Cheol Hwang
Appl. Sci. 2020, 10(24), 8843; https://doi.org/10.3390/app10248843 - 10 Dec 2020
Cited by 6 | Viewed by 2781
Abstract
In this paper, a Spidron fractal dipole antenna with a ferrite-loaded artificial magnetic conductor (AMC) is presented. By applying ferrite composed of nickel–zinc with a high permeability value, a compact AMC that operates in the broadband frequency range within the high-frequency/very-high-frequency/ultra-high-frequency (HF/VHF/UHF) bands [...] Read more.
In this paper, a Spidron fractal dipole antenna with a ferrite-loaded artificial magnetic conductor (AMC) is presented. By applying ferrite composed of nickel–zinc with a high permeability value, a compact AMC that operates in the broadband frequency range within the high-frequency/very-high-frequency/ultra-high-frequency (HF/VHF/UHF) bands was designed. A Spidron fractal-shaped dipole antenna with a quasi-self-complementary structure was designed and combined with a miniaturized ferrite-loaded AMC. This allowed the designed AMC-integrated dipole antenna to operate in a wide frequency band, covering the HF/VHF/UHF bands, with low-profile characteristics. A prototype of the proposed Spidron fractal dipole antenna with the AMC was manufactured and measured and found to meet low VSWR (voltage standing wave radios) specifications of <3.5 within the 20–500 MHz bandwidth range. The simulated and measured results are in good agreement. The size of the Spidron fractal dipole antenna with the AMC is 0.03×0.026×0.001λ3 relative to the wavelength of the lowest operating frequency. The received power of the Spidron fractal dipole antenna with the AMC was also measured when it was applied to relatively small applications, such as a manpack in this case. Full article
(This article belongs to the Special Issue Antenna Design for Microwave and Millimeter Wave Applications: Latest Advances and Prospects)
►▼ Show Figures

Figure 1

17 pages, 11346 KiB  
Article
Quasi-Yagi Slotted Array Antenna with Fan-Beam Characteristics for 28 GHz 5G Mobile Terminals
by Sungpeel Kim and Jaehoon Choi
Appl. Sci. 2020, 10(21), 7686; https://doi.org/10.3390/app10217686 - 30 Oct 2020
Cited by 8 | Viewed by 3295
Abstract
A quasi-Yagi slotted array antenna with fan-beam characteristics is proposed for 28 GHz 5G mobile terminals. The antenna is composed of a 1 × 8 slot antenna array with directors to enhance the half-power beamwidth (HPBW). The proposed antenna has a fan-beam radiation [...] Read more.
A quasi-Yagi slotted array antenna with fan-beam characteristics is proposed for 28 GHz 5G mobile terminals. The antenna is composed of a 1 × 8 slot antenna array with directors to enhance the half-power beamwidth (HPBW). The proposed antenna has a fan-beam radiation pattern with a simulated HPBW of 256.72° and a peak gain of 11.16 dBi. In addition, the proposed antenna covers ±48° using a beam steering mechanism. Mutual coupling reduction is achieved by inserting slits between the adjacent slot radiators on the ground plane. The simulated −10 dB reflection coefficient bandwidth of the proposed antenna is 1.79 GHz (27.03–28.82 GHz), and the mutual coupling between each of the slot radiators is lower than −25.02 dB over the 28 GHz target band (27.5–28.35 GHz). To investigate the effect of a human body in a practical environment, the power density was considered to estimate the electromagnetic exposure with a simplified skin model. The measured results were in good agreement with the simulated ones and demonstrated that the proposed antenna could be used for 5G mobile terminals. Full article
(This article belongs to the Special Issue Antenna Design for Microwave and Millimeter Wave Applications: Latest Advances and Prospects)
►▼ Show Figures

Figure 1

11 pages, 3781 KiB  
Article
Design of a Monopulse System Using a Single Patch Radiator with a Simple Multi-Mode Substrate Integrated Waveguide Feeding Network
by Sangwoon Youn, Tae Heung Lim, Byung-jun Jang and Hosung Choo
Appl. Sci. 2020, 10(20), 7224; https://doi.org/10.3390/app10207224 - 16 Oct 2020
Cited by 3 | Viewed by 2650
Abstract
This paper proposes the design of a single radiator monopulse antenna with a substrate integrated waveguide (SIW) multi-mode feeding system to reduce the aperture size and simplify the feeding structure. The proposed antenna can effectively reduce the overall system size by using a [...] Read more.
This paper proposes the design of a single radiator monopulse antenna with a substrate integrated waveguide (SIW) multi-mode feeding system to reduce the aperture size and simplify the feeding structure. The proposed antenna can effectively reduce the overall system size by using a single patch radiator, compared to conventional systems that require multiple radiators. In addition, to simplify the structure of the pattern comparator we use a SIW multi-mode feeding system with TE10 and TE20 modes. To verify the feasibility, the patch antenna with the SIW multi-mode feed is fabricated, and its antenna characteristics of reflection coefficients, mutual coupling, and radiation patterns are measured in a full anechoic chamber. The accuracy of the direction of arrival (DOA) estimation is further improved by applying the derived calibration factor to the resulting sum and difference ratio. The results demonstrate that the proposed antenna is suitable for compact and lightweight monopulse systems with the single radiator and the simple multi-mode feeding network. Full article
(This article belongs to the Special Issue Antenna Design for Microwave and Millimeter Wave Applications: Latest Advances and Prospects)
►▼ Show Figures

Figure 1

14 pages, 5846 KiB  
Article
Software-Defined Radio Beamforming System for 5G/Radar Applications
by Diogo Marinho, Raul Arruela, Tiago Varum and João N. Matos
Appl. Sci. 2020, 10(20), 7187; https://doi.org/10.3390/app10207187 - 15 Oct 2020
Cited by 13 | Viewed by 5192
Abstract
Based on the flexibility of software-defined radio (SDR) techniques applied to an array of antennas, this article presents a beamforming architecture designed to operate in millimeter-wave bands (28 GHz), with possible applications in radar and 5G systems. The system structure, including its main [...] Read more.
Based on the flexibility of software-defined radio (SDR) techniques applied to an array of antennas, this article presents a beamforming architecture designed to operate in millimeter-wave bands (28 GHz), with possible applications in radar and 5G systems. The system structure, including its main constituents such as the radio frequency (RF) frontend modules, the radiating elements as well as the baseband processing on the host computer are widely described. Beamforming is achieved by digitally controlling the signals that feed the antennas. The experimental measurements performed in an anechoic chamber validate the proposed approach. Full article
(This article belongs to the Special Issue Antenna Design for Microwave and Millimeter Wave Applications: Latest Advances and Prospects)
►▼ Show Figures

Figure 1

15 pages, 6955 KiB  
Article
Design of an Electrically Small, Planar Quasi-Isotropic Antenna for Enhancement of Wireless Link Reliability under NLOS Channels
by Sonapreetha Mohan Radha, Mingyu Jung, Pangun Park and Ick-Jae Yoon
Appl. Sci. 2020, 10(18), 6204; https://doi.org/10.3390/app10186204 - 7 Sep 2020
Cited by 14 | Viewed by 4114
Abstract
The performance of wireless networks can be greatly influenced by the radiation pattern and polarization of the antennas at the nodes, especially when they are under non-line-of-sight (NLOS) channel environments. In this study, we designed a planar quasi-isotropic antenna based on the combination [...] Read more.
The performance of wireless networks can be greatly influenced by the radiation pattern and polarization of the antennas at the nodes, especially when they are under non-line-of-sight (NLOS) channel environments. In this study, we designed a planar quasi-isotropic antenna based on the combination of a meandered electric dipole and an electrically small loop at a frequency of 2.45 GHz. Its electrical size (ka) is 0.47 and shows a gain deviation of 3.01 dB with radiation efficiency of 82.6% per the simulation. The performance of a wireless link under the line-of-sight and NLOS channels in an indoor environment was measured using the proposed quasi-isotropic antenna as a receiving antenna after validating its radiation and impedance properties experimentally (the measured gain deviation: 5.2 dB, the measured radiation efficiency: 79.2%). This study demonstrates that better properties are achieved using the quasi-isotropic antenna. The quasi-isotropic antenna shows an improved packet delivery ratio (PDR) and received signal strength indicator (RSSI) compared to the results using omni-directional antennas as a transmitting and receiving pair in the NLOS channels. To the best of our knowledge, the experimental validation of the enhancement of wireless link reliability using a quasi-isotropic antenna has not been reported before, and was first carried out in this study. Full article
(This article belongs to the Special Issue Antenna Design for Microwave and Millimeter Wave Applications: Latest Advances and Prospects)
►▼ Show Figures

Figure 1

12 pages, 5665 KiB  
Article
Numerical Study on the Feasibility of a 24 GHz ISM-Band Doppler Radar Antenna for Near-Field Sensing of Human Respiration in Electromagnetic Aspects
by Seungyong Park, Sungpeel Kim, Dong Kyoo Kim, Jaehoon Choi and Kyung-Young Jung
Appl. Sci. 2020, 10(18), 6159; https://doi.org/10.3390/app10186159 - 4 Sep 2020
Cited by 7 | Viewed by 2100
Abstract
The feasibility study of a 24 GHz industrial, scientific, and medical (ISM) band Doppler radar antenna in electromagnetic aspects is numerically performed for near-field sensing of human respiration. The Doppler radar antenna consists of a transmitting (Tx) antenna and a receiving (Rx) antenna [...] Read more.
The feasibility study of a 24 GHz industrial, scientific, and medical (ISM) band Doppler radar antenna in electromagnetic aspects is numerically performed for near-field sensing of human respiration. The Doppler radar antenna consists of a transmitting (Tx) antenna and a receiving (Rx) antenna close to the human body for a wearable device. The designed slot-type Doppler radar antenna is embedded between an RO4350B superstrate and an FR-4 substrate. To obtain the higher radiation pattern of the antenna towards the human body, a ground plane reflector is placed underneath the substrate. The measured −10 dB reflection coefficient (S11) bandwidth is 23.74 to 25.56 GHz and the mutual coupling (S21) between Tx and Rx antennas is lower than −30 dB at target frequencies. The Doppler radar performance of the proposed Doppler radar antenna is performed numerically by investigating the signal returned from the human body. The Doppler effect due to human respiration is investigated through the I/Q and arctangent demodulation of the returned signal. According to the results, the phase variation of the returned signal is proportional to the displacement of the body surface, which is about 0.8 rad in accordance with 1 mm displacement. The numerical experiments indicate that the proposed Doppler radar antenna can be used for near-field sensing of human respiration in electromagnetic aspects. Full article
(This article belongs to the Special Issue Antenna Design for Microwave and Millimeter Wave Applications: Latest Advances and Prospects)
►▼ Show Figures

Figure 1

11 pages, 2747 KiB  
Article
Method for Estimating Optimal Position of S-Band Relay Station through Path Loss Analysis in an Outdoor Environment
by Doyoung Jang, Sungsik Wang, Chun Won Kim, Yong Bae Park and Hosung Choo
Appl. Sci. 2020, 10(17), 6089; https://doi.org/10.3390/app10176089 - 2 Sep 2020
Cited by 2 | Viewed by 1805
Abstract
This article investigates a novel estimation method to optimize the position of a relay station of the S-band telemetry system in outdoor environments. To determine an optimal relay station position, complex terrain surface and buildings near the Naro Space Center are included in [...] Read more.
This article investigates a novel estimation method to optimize the position of a relay station of the S-band telemetry system in outdoor environments. To determine an optimal relay station position, complex terrain surface and buildings near the Naro Space Center are included in the EM (Electromagnetic) simulation. The optimal relay station position is then determined using the estimation method by comparing the path losses from the rocket to the main station and some candidate positions of the relay station. To better understand the path loss, the ray analysis is also conducted, and the result demonstrates that once the rocket altitude to be covered by the relay station is determined, it is possible to find the optimum position of the relay station. Full article
(This article belongs to the Special Issue Antenna Design for Microwave and Millimeter Wave Applications: Latest Advances and Prospects)
►▼ Show Figures

Figure 1

14 pages, 9320 KiB  
Communication
A Novel High Gain Monopole Antenna Array for 60 GHz Millimeter-Wave Communications
by Tarek S. Mneesy, Radwa K. Hamad, Amira I. Zaki and Wael A. E. Ali
Appl. Sci. 2020, 10(13), 4546; https://doi.org/10.3390/app10134546 - 30 Jun 2020
Cited by 40 | Viewed by 3939
Abstract
This paper presented the design and implementation of a 60 GHz single element monopole antenna as well as a two-element array made of two 60 GHz monopole antennas. The proposed antenna array was used for 5G applications with radiation characteristics that conformed to [...] Read more.
This paper presented the design and implementation of a 60 GHz single element monopole antenna as well as a two-element array made of two 60 GHz monopole antennas. The proposed antenna array was used for 5G applications with radiation characteristics that conformed to the requirements of wireless communication systems. The proposed single element was designed and optimized to work at 60 GHz with a bandwidth of 6.6 GHz (57.2–63.8 GHz) and a maximum gain of 11.6 dB. The design was optimized by double T-shaped structures that were added in the rectangular slots, as well as two external stubs in order to achieve a highly directed radiation pattern. Moreover, ring and circular slots were made in the partial ground plane at an optimized distance as a defected ground structure (DGS) to improve the impedance bandwidth in the desired band. The two-element array was fed by a feed network, thus improving both the impedance bandwidth and gain. The single element and array were fabricated, and the measured and simulated results mimicked each other in both return loss and antenna gain. Full article
(This article belongs to the Special Issue Antenna Design for Microwave and Millimeter Wave Applications: Latest Advances and Prospects)
►▼ Show Figures

Figure 1

16 pages, 5593 KiB  
Article
Design of Heterogenous Two-Element Array Antenna on an Electrically Thick Substrate for High Isolation and Low Pattern Correlation Using Modal Difference in Radiation Patterns
by Tae Heung Lim, Byung-Jun Jang and Hosung Choo
Appl. Sci. 2020, 10(11), 3916; https://doi.org/10.3390/app10113916 - 5 Jun 2020
Cited by 4 | Viewed by 2651
Abstract
In this paper, we propose a novel design of a two-element array antenna on an electrical thick substrate with an extremely narrow array distance. The proposed array consists of a rectangular ring patch printed on a thick substrate and a monopole wire in [...] Read more.
In this paper, we propose a novel design of a two-element array antenna on an electrical thick substrate with an extremely narrow array distance. The proposed array consists of a rectangular ring patch printed on a thick substrate and a monopole wire in the center of the substrate. Each element has a modal difference in the radiation pattern, causing high isolation and low correlation between the array elements. From the measurement results, the monopole and patch elements exhibit reflection coefficients of −10 dB and −10.7 dB with peak gains of 3.8 dBi and 6.1 dBi, respectively, at 1.6 GHz. The mutual coupling between the two elements is −20.7 dB. For modal analysis of the antenna pattern, spherical mode decomposition is performed on the radiation patterns of the two elements, and low envelope correlation coefficient levels below 16% are maintained. We also investigate the antijamming performance using a power inversion algorithm in a practical pattern nulling application; a null depth of −47.7 dB and a null width of 33.2° are obtained when the interference signal arrives at the elevation angle of 45°. Full article
(This article belongs to the Special Issue Antenna Design for Microwave and Millimeter Wave Applications: Latest Advances and Prospects)
►▼ Show Figures

Figure 1

Other

Jump to: Editorial, Research

11 pages, 6132 KiB  
Letter
Analysis of the Target Detection Performance of Air-to-Air Airborne Radar Using Long-Range Propagation Simulation in Abnormal Atmospheric Conditions
by Tea Heung Lim, Minho Go, Chulhun Seo and Hosung Choo
Appl. Sci. 2020, 10(18), 6440; https://doi.org/10.3390/app10186440 - 16 Sep 2020
Cited by 5 | Viewed by 3301
Abstract
In this paper, we propose the analysis of the target detection performance of air-to-air airborne radars using long-range propagation simulations with a novel quad-linear refractivity model under abnormal atmospheric conditions. The radar propagation characteristics and the target detection performance are simulated using the [...] Read more.
In this paper, we propose the analysis of the target detection performance of air-to-air airborne radars using long-range propagation simulations with a novel quad-linear refractivity model under abnormal atmospheric conditions. The radar propagation characteristics and the target detection performance are simulated using the Advanced Refractive Effects Prediction System (AREPS) software, where the refractivity along the altitude, array antenna pattern, and digital terrain elevation data are considered as inputs to obtain the path loss of the wave propagation. The quad-linear model is used to approximate the actual refractivity data, which are compared to the data derived using the conventional trilinear refractivity model. On the basis of the propagation simulations, we propose a detection performance metric in terms of the atmosphere (DPMA) for intuitively examining the long-range propagation characteristics of airborne radars in air-to-air situations. To confirm the feasibility of using the DPMA map in various duct scenarios, we employ two actual refractive indices to observe the DPMA results in relation to the height of the airborne radar. Full article
(This article belongs to the Special Issue Antenna Design for Microwave and Millimeter Wave Applications: Latest Advances and Prospects)
►▼ Show Figures

Figure 1

Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:
 
Displaying articles 1-15
Back to TopTop