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Open AccessFeature PaperArticle

Compact Differential-Fed Planar Filtering Antennas

Department of Computing Science, Umeå University, 901 87 Umeå, Sweden
Department of Electronics and Electrical Communications, Menoufia University, 32952 Menouf, Egypt
IHP—Leibniz-Institut für innovative Mikroelektronik, Im Technologiepark 25, 15236 Frankfurt (Oder), Germany
Author to whom correspondence should be addressed.
Electronics 2019, 8(11), 1241;
Received: 27 September 2019 / Revised: 21 October 2019 / Accepted: 25 October 2019 / Published: 30 October 2019
(This article belongs to the Section Microwave and Wireless Communications)
This paper proposes novel low-profile differential-fed planar antennas with embedded sharp frequency selectively. The antennas are compact and easy to integrate with differential devices without matching baluns. The antenna design is formulated as a topology optimization problem, where requirements on impedance bandwidth, directivity, and filtering are used as the design objectives. The optimized antennas operate over the frequency band 6.0–8.5 GHz. The antennas have reflection coefficients below −15 dB, cross-polarization levels below −42 dB, a maximum gain of 6.0 ± 0.5 dB, and a uniform directivity over more than 130° beamwidth angle in the frequency band of interest. In addition, the antennas exhibit sharp roll-off between the operational band and frequencies around the 5.8 GHz WiFi band and the 10 GHz X-band. One antenna has been fabricated with a good match between simulation and measurement results. View Full-Text
Keywords: antennas; differential line; planar circuits; filters; directivity; topology optimization; wideband systems antennas; differential line; planar circuits; filters; directivity; topology optimization; wideband systems
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Hassan, E.; Martynenko, D.; Wadbro, E.; Fischer, G.; Berggren, M. Compact Differential-Fed Planar Filtering Antennas. Electronics 2019, 8, 1241.

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