Computer-aided design of small patch antenna using (Al, Mg)TaO2 ceramics |
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Authors: | Sung-Hun Sim Chong-Yun Kang Ji-Won Choi Seok-Jin Yoon Hyun-Jai Kim Young-Joong Yoon |
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Affiliation: | (1) Thin Film Technology Research Center, KIST, Cheongryang, Seoul, 136-791, Korea;(2) Department of Electrical and Electronic Engineering, Yonsei University, Seoul, 120-749, Korea |
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Abstract: | The microwave dielectric properties of
(AMT)
ceramics and the design of small coplanar waveguide fed antenna (CPWFA) have been investigated. (
and (
have orthorhombic and tetragonal structure, respectively. As (
concentration increased, AMT ceramics transformed into the tetragonal structure. Specimens having tetragonal single phase could be obtained above x=0.6. As (
concentration increased, the grain size, dielectric constant
and quality factor (Q) significantly increased and the temperature coefficient of resonant frequency
changed from negative to positive. The
of
was realized at x=0.65 and the Q · f
O value and
for this composition were 112 470 GHz and 26.1, respectively. Newly developed
dielectric materials were used for 1.5 GHz band CPWFA design and fabrication. The size of the CPWFA can be reduced by using high dielectric constant AMT ceramics, insetting slits into the patch, and fabricating CPW feed line in the ground plane. The slits play a role in not only lowering a center frequency but also fine tuning for the proposed antenna together with the open stub of CPW feed line. The CPWFA with slits has a lower center frequency than the conventional CPWFA, which suggests that the antenna size can be reduced by as much as 16.3%. The structure simulations of the CPWFAs have been performed to obtain impedance matching and to investigate the effects of slits. Experimental results of the fabricated device were in good agreement with the simulation. |
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Keywords: | |
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