The Analysis of Stub on Coplanar-Fed of Single and Array Microstrip Antenna for Mobile Satellite Communication
The microstrip antenna has small, lightweight shape characteristics, and limit performances. It is necessary to increase the performances, especially the axial ratio (Ar) of the previous antenna configured in two layers accompanying the capacitive coupling between them. If length of feeding line and width-to-length ratio of radiating patch are not matched, it can decrease the Ar performance. This paper discusses about the analysis of previous antenna (two layers) and modified antenna (one layer), optimized modified antenna using stub on coplanar-fed both single and array microstrip patch antenna for mobile satellite communication, especially for receiver antenna, Rx. The Method of Moment (MoM) is used to analyze the antenna with an infinite ground plane and substrate. The antenna is made of a thin patch conductor and a microstrip-line. The microstrip-line is located on the same layer which has the thickness h = 1.6 mm and uses a conventional substrate (relative permittivity, εr = 2.17 and loss tangent, δ = 0.0009). The patch conductor is fed by a coplanar-fed with microstrip-line to obtain a conformal configuration. The dual-fed type is to generate a left-handed circular polarization (LHCP) which is combined with an equilateral triangle patch. In this case, one of the microstrip-line feeds is set longer than the other to introduce a 900 phase delay. Moreover, the simulation results discuss about the three varies size of stub embedded on coplanar-fed and compare among of them to confirm that the antenna satisfy the target. The results of single antenna using stub-fed, especially for bandwidth of axial ratio below 3-dB and gain above 5 dBic are about 0.02 GHz and 0.065 GHz, respectively. The results of array antenna, in the case of bandwidth of axial ratio below 3-dB and gain above 5 dBic are about 0.03 GHz and 0.3 GHz, respectively. In addition, the result for axial ratio of the modified antenna and the previous antenna at 2.5025 GHz are 0.27 dB and 1.02 dB, respectively. It is caused a coplanar-fed which connected directly to the radiating patch (one layer antenna).
one layer; stub; coplanar-fed; single and array microstrip patch; LHCP
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Published by INSIGHT - Indonesian Society for Knowledge and Human Development