Design of a Wide-Beamwidth Circular Patch Antenna Element Based on TM21 Mode for Phased Array Applications
B. Sevik (Istanbul Technical University, ASELSAN Inc.)
Kamil Karacuha (Istanbul Technical University)
G. O. Arican (ASELSAN Inc.)
F.T. Çelik (Microwave Sensing, Signals & Systems)
B.A. Yilmaz (ASELSAN Inc.)
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Abstract
This study presents a wide-beam circular microstrip patch element operating in the TM
21 mode for Ku-band phased arrays. In this design, the TM
21-mode conical radiation couples to symmetric parasitic dipoles on low- ϵ
r sidewalls, forming a Huygens-type radiator with a stable wide-angle pattern. Fullwave simulations show a resonance at 13.35 GHz with a return loss below -25dB and ∼ 450 MHz bandwidth for |S
11|< -10 dB. A flat-gain radiation pattern with a 3 dB beamwidth of ~ 275° is achieved, maintaining < 3 dB gain variation across -137.5°-+137.5°. Infinite-array analysis confirms matching better than -10 dB for elevation scans up to θ=70° within the band. The design provides a simple, array-compatible route toward wide-angle scanning arrays.
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