C波段有源接收天线子阵的设计

Design of C-band Active Receiving Antenna Subarray

随着无线技术的迅速发展,人们对无线设备的小型化要求日益提高,因此天线的小型化、宽带化和高增益成为了无线通信中的研究重点。有源天线由于其体积小、频带宽,受到广泛关注。针对这些发展要求,参考有源天线的2种形式,提出将二单元天线作为一个天线阵列的子阵,通过背馈方式与低噪声放大器集成形成一个有源接收天线子阵。测试结果表明,该有源子阵谐振频率在4.8 GHz,工作频段为4.6~5.0 GHz,在中心频率处回波损耗大于20 dB,增益大于15 dB,3 dB波束宽度为35.8°。与无源天线相比,同等尺寸下工作频带展宽得到拓展,增益得到明显提高。

With the rapid development of wireless technology, the demand for the miniaturization of wireless devices is increasing, miniaturized and broadband antenna becomes a focus of research in wireless communications.Active antennas attract extensive attention because of their small size and wide band.According to the development requirements, the paper proposes, on the basis of two forms of active antenna,that a two-element antenna can be taken as a subarray of anantenua array, and the subarray can be integrated with a low noise amplifier through back-feed mode to form an active receiving antenna subarray.The measurement results show that the resonance frequency of the active subarray is 4.8 GHz,the operating band is 4.6 to 5.0 GHz,the return loss is more than 20 dB within the center band,the gain is greater than 15 dB, and the 3 dB beam width is 35.8%. As compared with passive antenna, the proposed active antenna＇ s operating band is broadened,and its gain is obviously improved under the same size.