A 6-18 GHz Log-Periodic Monopole End-Fire Antenna Based on Microstrip-to-Slotline Transition

摘要

This paper presents a novel wideband log-periodic monopole end-fire antenna fed by a microstrip-to-slotline transition feeding network. The proposed transition consists of a microstrip stub and slot stub to achieve the wideband impedance matching, and remove the inverting converter and correct the errors in conventional log-periodic antenna array. The proposed novel log-periodic monopole antenna covers 6 GHz - 18GHz (S11< -10 dB) with flat gain of 7-8 dBi, and front-to-back ratio better than 18 dB.