40-65 GHz Dual-beam Dual-Band Tunable Microstrip CRLH Leaky-wave Antenna

초록

This paper proposes a composite right/left-handed (CRLH) dual-beam microstrip leaky-wave antenna (MLWA) with tunable operating region for V-band radiation coverage. Primarily, the symmetrical side-by-side dual-beam is obtained by the wideband excitation for second higher order mode within 52.5-65 GHz, and also realizes a pair of back to back half-modes generating two symmetrical side beams in E-plane with enhanced gain over 40-52 GHz with appropriate placement of metallic via holes. Mode switching is performed electronically by incorporating PIN diodes and proper biasing network. Finally, incorporating half-sinusoidal interdigital slot variations and periodically placed switching diodes enables composite right/left-handed media having frequency beam steering from backward-broadside-forward quadrant. Leaky bands in microstrip higher order modes were analyzed by dispersion characteristics, and the proposed antenna achieved -10 dB impedance bandwidth of 29.2%, scanning range in H-plane from -65° to +69.7°, and peak gain of 18.7 dBi for the unbiased state; and 28%, -78° to +69.6° and 18 dBi, respectively for the biased state. The average side lobe level and minimum cross polar level are obtained as 13.5 dB and 23 dB, respectively. The fabricated prototype responses closely matched theoretical predictions, verifying the proposed concept. © 2020 IEEE.

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