| Summary: | 碩士 === 龍華科技大學 === 電機工程研究所 === 97 === In this paper, the microwave dielectric properties of La(Mg1/2Sn1/2)O3 ceramics and Application in double layer microstrip antenna have been studied. Specimens were prepared using the conventional solid-state method. CuO, B2O3 and V2O5 were selected as liquid sintering additives to lower the sintering temperature of La(Mg1/2Sn1/2)O3. It is found the excellent microwave dielectric properties can be obtained with 0.5 wt.% V2O5 additives sintered at 1500℃ for 4h, εr=20.3； Q × f=48400 GHz（11.679 GHz）and τf=-87.5 ppm/℃.
In the design of double layer microstrip antenna for application in IEEE 802.11a（5.15~5.875 GHz）, the patch antenna was printed on a substrate of La(Mg1/2Sn1/2)O3 doped with 0.5 wt.% B2O3 additives. The patch antenna fed with a coplanar waveguide line fabricated on a FR4 substrate. The measurement results of the double layer microstrip antenna at 5.62 GHz has been presented. Using this technique, a return loss of -35.2 dB at 5.29 GHz, a return loss of -40.8 dB at 5.92 GHz, a 18.1 % （5.11~6.13 GHz）bandwidth of center frequency （return loss < -10 dB）have been achieved. Peak antenna gain is about 7.01 dBi （at 5.38 GHz） and an average gain of 4.62 dBi in the xz-plane for frequencies within in the -10 dB S11 bandwidth. Peak antenna gain is about 9.53 dBi （at 6.13 GHz）and an average gain of 6.98 dBi in the yz-plane for frequencies within in the -10 dB S11 bandwidth.
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