串联邻近耦合馈电微带天线阵列的设计

Design of Series Proximity-coupled Microstrip Antenna Arrays

针对高增益、高效率的微带天线需求,将邻近耦合馈电引入串馈微带阵列,提出两种串联谐振微带天线阵列设计。首先研制出1#16元低副瓣串联天线阵列,工作频率35 GHz,测试得到增益为17.3 dBi,带宽4.3%,副瓣电平-17.6 dB。在上述馈电方式中引入U型谐振器及馈电缝隙,提出一种串联邻近耦合馈电的双频正交极化天线阵列,中心频率分别为4.5 GHz和5.0 GHz,两个频带内带宽分别为5.0%和7.8%,隔离良好,中心频率处增益为7.6 dBi和8.2 d Bi。这种馈电方式便于组成高效率的大阵列,同时具有良好带宽,在实现多功能共口径阵列中具有独特优势。

To meet the requirements of high-gain and high-efficiency microstrip antennas,two series microstrip resonant antenna arrays are proposed by introducing proximity-coupled feed scheme into the series-fed arrays.A 16-element low side-lobe series array is developed with a center frequency of 35 GHz.Measured gain of 17.3 dBi,bandwidth of 4.3%,and side-lobe level of-17.6 dB have been obtained.The proximity-coupling feed is furthur improved with introducing U resonators and feeding slots,so that a novel series dual-band orthogonal-polarized antenna array is proposed.Bandwidths of 5.0%and 7.8%,and maximum gains of 7.6 dBi and 8.2 dBi have been achieved for the center frequencies of 4.5 GHz and 5.0 GHz,respectively.Good isolation between two bands is obtained.The feed scheme is convenient to form a large array with high efficiency and good bandwidth.It also has unique advantages in realizing multifunctional shared-aperture microstrip antenna arrays.