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Volume 15
Issue 5
10.3390/app15052507
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Article

Electromagnetic Absorber-Embedded Ka-Band Double-Layer Tapered Slot Antenna for the Reduced Radar Cross Section at X-Band

by
Wonkyo Kim
1,
Youngwan Kim
2,
Hee-Duck Chae
2,
Jihan Joo
2,
Jun-Beom Kwon
2 and
Ick-Jae Yoon
1,*
1
Department of Electrical Engineering, Chungnam National University, Daejeon 34134, Republic of Korea
2
LIG Nex1 Co., Ltd., Yongin-si 16911, Republic of Korea
*
Author to whom correspondence should be addressed.
Appl. Sci. 2025, 15(5), 2507; https://doi.org/10.3390/app15052507
Submission received: 27 January 2025 / Revised: 21 February 2025 / Accepted: 24 February 2025 / Published: 26 February 2025
(This article belongs to the Special Issue Multi-Band/Broadband Antenna Design, Optimization and Measurement)
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Abstract

An electromagnetic (EM) absorber-embedded Ka-band double-layer tapered slot antenna (DLTSA) is proposed in this work. The EM absorber is placed on both sides of the tapered radiating slots as a means of achieving the reduced monostatic radar cross section (RCS) at the X-band. A conventional tapered slot antenna (TSA) with EM absorbers at the same position suffers from the distorted current distribution from the feedline to the radiating slots and causes a degraded radiation performance with a tilted beam. In contrast, the DLTSA with EM absorbers maintains the impedance and radiation characteristics of the antenna without the EM absorbers, while achieving the reduced monostatic RCS for the cross-polarized incident wave. The functionality of the reduced RCS is verified with the 4-by-4 DLTSA array design. The 4-by-4 array prototype with FGM-125 EM absorbers is matched at the Ka-band with a 14.7 dBi boresight gain at 35 GHz. The monostatic RCS is measured in an indoor environment, showing 6.5 dB monostatic RCS reduction at the X-band on average, verifying the computed expectations. This work validates the possible use of EM absorbers at the front side of a missile seeker composed of end-fire radiating elements.
Keywords: array antenna; electromagnetic absorber; radar cross section; tapered slot antenna array antenna; electromagnetic absorber; radar cross section; tapered slot antenna

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MDPI and ACS Style

Kim, W.; Kim, Y.; Chae, H.-D.; Joo, J.; Kwon, J.-B.; Yoon, I.-J. Electromagnetic Absorber-Embedded Ka-Band Double-Layer Tapered Slot Antenna for the Reduced Radar Cross Section at X-Band. Appl. Sci. 2025, 15, 2507. https://doi.org/10.3390/app15052507

AMA Style

Kim W, Kim Y, Chae H-D, Joo J, Kwon J-B, Yoon I-J. Electromagnetic Absorber-Embedded Ka-Band Double-Layer Tapered Slot Antenna for the Reduced Radar Cross Section at X-Band. Applied Sciences. 2025; 15(5):2507. https://doi.org/10.3390/app15052507

Chicago/Turabian Style

Kim, Wonkyo, Youngwan Kim, Hee-Duck Chae, Jihan Joo, Jun-Beom Kwon, and Ick-Jae Yoon. 2025. "Electromagnetic Absorber-Embedded Ka-Band Double-Layer Tapered Slot Antenna for the Reduced Radar Cross Section at X-Band" Applied Sciences 15, no. 5: 2507. https://doi.org/10.3390/app15052507

APA Style

Kim, W., Kim, Y., Chae, H.-D., Joo, J., Kwon, J.-B., & Yoon, I.-J. (2025). Electromagnetic Absorber-Embedded Ka-Band Double-Layer Tapered Slot Antenna for the Reduced Radar Cross Section at X-Band. Applied Sciences, 15(5), 2507. https://doi.org/10.3390/app15052507

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