Microstrip-fed quasi-Yagi antenna with broadbandcharacteristics

Abstract

A compact and uniplanar antenna with broadband characteristics is presented. The novel Yagi-like printed dipole array antenna is fed by a microstrip-to-coplanar strip transition, and uses the truncated microstrip ground plane as its reflecting element. An X-band prototype measures a bandwidth of 17%, with 6.5 dB gain, 18 dB front-to-back ratio, and lower than –15 dB cross-polarisation level at 10 GHz.