Low-Profile Log-Periodic Monopole Array


This paper presents an occasional-profile log-periodic monopole array antenna with finish-hearth radiation and vertical polarization. It consists of 15 monopole elements and a conductor-backed coplanar strip line as the feeding line. The monopoles are of the same height but loaded with high hats of different sizes to attain the desired resonant frequencies. A wideband transition from coaxial line to conductor-backed coplanar strip line is designed for the antenna feed. A prototype is fabricated and tested. Measured results show that an impedance bandwidth from 1.5 to six.8 GHz (4.fifty three:1) for $textVSWR <2.3$ and a gain better than four.five dBi over the same operating frequency band are obtained whereas the antenna features a terribly low profile of only $0.047;lambda_L$ ($lambda_L$ is the free-space wavelength at the lowest operating frequency).

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