Title :
High performance K- and Q-band quasi-Yagi linear arrays
Author :
Nishio, Takahide ; Wang, Yuanxun ; Qian, Yongxi ; Itoh, Tatsuo
Author_Institution :
Dept. of Electr. Eng., California Univ., Los Angeles, CA, USA
Abstract :
Both K-band (20 GHz) and Q-band (44 GHz) passive linear arrays using quasi-Yagi antenna elements are presented. No scan-blindness is observed when the beam is steered 55 degrees from broadside for an inter-element spacing of 0.4λ at X-band. Broad bandwidth of 50% is observed at X-band while both K and Q-band arrays demonstrate over 30% bandwidth (VSWR<2). Measured radiation patterns in four-element linear arrays show well-defined endfire main beams with first sidelobe levels better than -12 dB, cross polarization levels better than -15 dB, and array gains of 8-10 dB across the entire operating band.
Keywords :
Yagi antenna arrays; antenna radiation patterns; broadband antennas; electromagnetic wave polarisation; linear antenna arrays; microwave antenna arrays; millimetre wave antenna arrays; scanning antennas; 20 GHz; 44 GHz; K-band antenna arrays; Q-band antenna arrays; X-band; array gain; broadband antennas; cross polarization level; endfire main beams; linear arrays; quasi-Yagi arrays; radiation patterns; scan-blindness; sidelobe levels; Antenna measurements; Bandwidth; Blindness; Broadband antennas; Finite difference methods; Frequency; Linear antenna arrays; Mutual coupling; Phased arrays; Time domain analysis;
Conference_Titel :
Antennas and Propagation Society International Symposium, 2002. IEEE
Print_ISBN :
0-7803-7330-8
DOI :
10.1109/APS.2002.1017047
