摘要:

本文設計了一種S波段寬帶微帶天線。該天線由差分微帶天線和寬帶180?相移功分器兩部分組成。首先利用180?寬帶相移功分器將單饋端口轉換成差分饋電端口，然后通過加空氣層和在貼片上開雙十字槽進行帶寬擴展。由于采用了差分饋電結構，天線既擴展了工作帶寬，又在帶寬內實現了良好的輻射性能，例如交叉極化低、方向圖對稱且增益穩定。研制出的天線矩形貼片尺寸為45.5 mm × 35.4 mm (W × L)，天線高度為13.5 mm。測試結果表明天線在10 dB回波損耗上的帶寬為2.5~3.5 GHz，約33.3%，帶寬內方向圖穩定，交叉極化在?20 dB以下。

A broad band microstrip antenna is designed at S band in this paper. The antenna is composed of a differential-fed microstrip patch and a broad band 180?-phase-shift power divider. The 180?- phase-shift power divider converts the single feeding port to the differential feeding ports. Then, the bandwidth is broadened by adding air layer and cutting double cross slots on the patch. Due to the differential-feeding structure, the proposed antenna has not only the broad band characteristic, but also desirable good radiation performance during the bandwidth such as low cross-pola- rization, symmetric patterns and stable gain. The size of the designed antenna rectangular patch is 45.5 mm × 35.4 mm (W × L). The antenna height is 13.5 mm. The measured results show that an impedance bandwidth from 2.5 to 3.5 GHz, i.e., 33.3%, is achieved. The pattern is quite stable dur-ing the bandwidth. The cross-polarization is under ?20 dB.

總結

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