60-GHz Dual-Feed Oversized Patch Antenna for Polarization Diversity Applications
Date Issued
2014
Date
2014
Author(s)
Kung, Yi-Hsiang
Abstract
The dual-feed dual polarized oversized patch antenna is presented in this thesis for 60-GHz applications. The term “oversize” means that unlike a conventional patch antenna which is operated at its fundamental mode, the proposed antenna is enlarged by exploiting higher-order modes. In 60-GHz bands, the dimensions of the antennas are usually comparable with their microstrip feed lines, resulting in feeding difficulties. The proposed oversized antennas can solve these problems effectively. Good input matching can be achieved without using complicated matching networks. Furthermore, owing to its enlarged size, the manufacturing error tolerance of fabrication based on the low temperature co-fired ceramics technology can be increased.
The proposed antenna is fed by two vertically placed microstrip lines, exciting two similar modes with orthogonal linear polarizations for polarization diversity applications. The power loss due to the polarization mismatches can thus be reduced. Due to its enlarged size, the oversized antenna can also have higher antenna gain than the conventional one without using its array form. Moreover, in the modified designs, pairs of slots are etched on the patch to increase the port-to-port isolation with the current boundary condition maintained. In addition to the direct microstrip line feed, the microstrip-T coupled feed is also designed in this thesis to improve the isolation.
All designs are verified by the experiment at 5.8-GHz ISM band. Up to 35-dB in-band isolation are achieved. Around 9-dBi antenna gain are obtained with a single antenna. Simulations for the 60-GHz version are provided for future experimental verification.
Subjects
微帶天線
高階模態
雙極化
毫米波
Type
thesis
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