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A 24-GHz Modular Transmit Phased Array

This paper presents a 24-GHz modular transmit phased array based on the extended-resonance technique. The extended-resonance technique, capable of obviating the need for separate power divider and phase shifters, is utilized along with heterodyne mixing in the proposed phased array. Heterodyne mixing allows phase shifting to be performed at lower frequencies. A modular approach is exploited to realize a scalable phased-array design. The design complexity associated with large phased arrays can be significantly reduced by using this approach. Moreover, a modified extended-resonance circuit topology to enhance the scan range is proposed. As a proof-of-principle, the 24-GHz transmit phased array is fabricated and the measurement results are presented.