Title :
Gain Improvement in Time-Modulated Linear Arrays Using SPDT Switches
Author :
Zhu, Quanjiang ; Yang, Shiwen ; Yao, Ruilin ; Nie, Zaiping
Author_Institution :
Sch. of Electron. Eng., Univ. of Electron. Sci. & Technol. of China (UESTC), Chengdu, China
fDate :
7/4/1905 12:00:00 AM
Abstract :
Time-modulated linear arrays (TMLAs) based on single-pole-single-throw (SPST) switches usually have higher reduction in gain due to the sideband radiation and power absorption of the off-state absorptive switches. In this letter, a novel approach is proposed to improve the gain of TMLAs using single-pole-double-throw (SPDT) switches. The gain of the proposed TMLA can be improved significantly by controlling two array elements with each SPDT switch. Moreover, the proposed TMLA has a constant instantaneous directivity, which is favorable for some applications. Numerical results are presented to illustrate the proposed approach by considering a 16-element linear array with a -30 dB sidelobe level.
Keywords :
linear antenna arrays; switches; SPDT switch; SPDT switches; SPST switches; TMLA; gain improvement; off-state absorptive switches; power absorption; sideband radiation; single-pole-double-throw switches; single-pole-single-throw switches; time-modulated linear antenna arrays; Amplitude modulation; Antenna arrays; Feeds; Gain; Switches; Antenna arrays; radio frequency (RF) switch; time modulation;
Journal_Title :
Antennas and Wireless Propagation Letters, IEEE
DOI :
10.1109/LAWP.2012.2213292