Wideband Stacked Square Microstrip Antenna with Shorting Plates
نویسنده
چکیده
The impedance bandwidth of a probe-fed microstrip antenna (MSA) is inherently narrow. Therefore, many approaches to increase the bandwidth such as using additional microstrip resonators [1], stacking parasitic patches above a fed patch (stacked MSA) [2] and embedding a U-shaped slot in the radiating patch [3], etc. have been proposed. It is desirable for wideband antennas that the frequency characteristic of the vswr be wide and the direction of the radiation peaks is the same in the frequency range. The structure of the stacked MSA is relatively simple because it can be realized by just stacking a parasitic patch, whose geometry is the same as the fed patch, above the fed patch. In the conventional half wavelength stacked MSA, although the radiation peak in the first mode is at high elevation angles, that in the second mode is at low elevation angles [4]. Therefore, the bandwidth of the stacked MSA is only enhanced in the frequency band of the first mode. In this letter, a wideband stacked square MSA with two shorting plates is proposed. The proposed antenna has good impedance matching and radiates at high elevation angles in the frequency range between the first and second resonant modes. Some wideband stacked MSAs with shorting pins or plates have been proposed [5], [6]. However, although the antenna sizes are compact, the bandwidths (20–30%) are a half or less than of the antenna presented here. In the calculations in this letter, the simulation software package FIDELITY 3.53, based on the finite difference time domain method is used [7]. In order to ascertain the accuracy of the calculated results, the calculated vswr and gain are compared with experimental data.
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ورودعنوان ژورنال:
- IEICE Transactions
دوره 91-B شماره
صفحات -
تاریخ انتشار 2008