Abstract
In this paper a newly developed patch antenna, designated as the parallel-plate transmission line feeding differentially driven patch antenna is presented. The parallel-plate transmission line will not introduce inductance to the input impedance of a patch antenna, thus the height of the patch can be largely increased. Measurements show that the 3-dB-gain bandwidth can be obtained to 65% (0.86–1.93 GHz), return loss is -20dB, VSWR is 1.3 and impedance is 51 ohm at resonant frequency of 1.58GHz. The radiation pattern is stable and this antenna is designed for GPS application.
Highlights
In Recent years, differential circuits are becoming more popular in microwave circuit design, due to their good performances such as low noise, harmonic suppression, high linearity, and large dynamic range
The 3-dB gain bandwidth of the differentially driven patch antenna is defined as a range of frequencies over which the differential reflection coefficient is less than 10 dB (Sd11
The basic structure of the proposed antennas consists of a ground plane, a parallel-plate transmission line formed by two parallel plates, and a radiation patch
Summary
In Recent years, differential circuits are becoming more popular in microwave circuit design, due to their good performances such as low noise, harmonic suppression, high linearity, and large dynamic range. The height of the probe has to be increased with the height of the patch, which introduces extra inductance to the input impedance and deteriorates the input matching of the antenna. This effect limits the bandwidth of patch antennas [8]. The parallel plate transmission line will not introduce inductance to the input impedance of the patch antenna, the height of the patch can be largely increased
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