Abstract
In this study, a miniaturized GPS band(L1: 1.575 GHz) antenna that can be mounted on a small device is proposed. The miniaturized antenna was manufactured such that it could be attached to the surface of styrofoam(ϵr=1.06, t=10 mm) having a size of 12×11×10 mm(0.06×0.06×0.05 λ). The thickness and length of the feeding line and the spacing between short stubs were adjusted for impedance matching. S11was found to be −38.6 dB at the center frequency of the fabricated antenna, 1.575 GHz. The radiation pattern measurement results show that the maximum gain of Eθ is −2.3 dBi in 0 directions in the xz-plane, and that Eθ is an omnidirectional characteristic with an average gain of −3.2 dBi in the yz-plane. Under these circumstances, it was found that the antenna can be used as an ultra-small microstrip antenna, which can be mounted on a small device, and is capable of preserving a reduction ratio of 87 % as compared to a λ/2 microstrip patch antenna.
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