Improved bandwidth and radiation efficiency of series‐fed patch array using cascaded inset‐fed mechanism

In this letter, a novel design approach of low-sidelobe series-fed patch antenna array is proposed which has enhanced bandwidth and radiation efficiency. It based on the fact that out-to-input voltage amplitude ratio an inset-fed element could be manipulated by changing insert depth output microstrip line. Thus, utilizing cascaded mechanism, achieves tapering for desired sidelobe suppression. The step-down transformer model are presented to reveal as equivalent circuit characterization element. As proof-of-concept, 12-element operating 24 GHz with 20 dB level (SLL) designed, simulated, prototyped. found that, in contrast conventional width-tapering array, impedance broadening, from 1.7% 2.5%, efficiency improvement 7% meanwhile.