Transmission-Line Coupling of Active Microstrip Antennas for One- and Two-Dimensional Phased Arrays

Ragip ISPIR  Shigeji NOGI  Minoru SANAGI  Kiyoshi FUKUI  

IEICE TRANSACTIONS on Electronics   Vol.E80-C       pp.1211-1220
Publication Date: 1997/09/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Category: Microwave and Millimeter Wave Technology
microwave,  power combining,  phased array,  active antenna,  transmission-line coupling,  

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Several types of transmission-line coupling are analyzed to use in one- and two-dimensional active antenna arrays, and a method is developed to scan the beam of the arrays using the mutual locking theory. To compensate the undesired effect of strong radiative coupling of the nearest neighbor elements on the phased array performance, addition of resistive stubs to the end elements is proposed. In a 14 array it was observed that after the connection of resistive stubs, the scanning range of the array increased considerably. The effect of oscillator amplitudes on the phased array behavior is explored numerically. In the experiments main beam of 22 and 33 active antenna arrays were steered up to 25 and 15, respectively in the H-plane.