In this paper, a dual‐polarized antenna that can be used in the 1.7‐2.17 GHz band is proposed. The proposed antenna is a dual‐polarized antenna with parasitic element; it has improved isolation property. The isolation of antenna arrays appears as a synthesis of the isolation of single element and the isolation of adjacent element. The isolation of the antenna array was improved by placing a parasitic element in front of the element so that the isolation signal of a single element and the isolation signal of the adjacent element would cancel each other out. The proposed antenna has a return loss of −15.4 dB or less and an isolation of 31.25 dB or more in the service band, and a gain of 10.87 dBi or higher in the measurement frequency. The proposed antenna is expected to be usable as a dual‐polarized antenna.
In this article, a wideband dual‐polarized antenna that can be used in the 1.7‐3.7 GHz band is proposed. The proposed antenna is a dual‐polarized antenna with a plate having a parasitic elements and it improves the gain characteristics in wide‐band. In general, an antenna with a reflection plate is difficult to have a constant gain characteristic in the wide‐band, because the electrical distance between the radiation elements and the reflection plate is variable for the bandwidth. In this article, a parasitic element is assigned to the front side of the radiation element to improve the gain of the band in which the characteristic is degraded. The proposed antenna has the VSWR < 2:1 in the band of 1540‐3795 MHz (84.5% of center frequency) and has a gain of 7.92 dBi or more at the measured frequency.
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