一种基于SIW 技术的滤波天线设计方法

A Design Method for Filtering Antenna Based on SIW Technology

中文关键词:  基片集成波导  半模基片集成波导  滤波天线  传输零点

英文关键词:substrate integrated waveguide  half-mode substrate integrated waveguide  filtering antenna  transmission zero

中文摘要:

      文中基于基片集成波导(SIW)技术提出了一种滤波天线设计方法。首先根据传统耦合矩阵综合法设计出SIW 滤波器,然后结合半模基片集成波导(HMSIW)技术设计出滤波天线。该方法简单有效,并且能够额外引入一个传输零 点,使滤波天线的频率选择性得以提高。文中以三阶滤波天线为例,验证该方法的有效性。基于TE101 模式,使用两个 SIW腔和一个HMSIW腔形成三阶滤波响应,SIW谐振腔用作高Q谐振器,HMSIW谐振腔同时作为辐射腔。实测的中心 频率为6.52 GHz,-10 dB带宽为7.4%(6.26 GHz~6.74 GHz)。通带内实测增益基本处于5 dBi,且在下阻带产生了一个 传输零点,有效地提高了滤波天线在低频处的频率选择性。实测结果与仿真结果吻合较好,验证了设计方法的有效性。

英文摘要:

      In this paper a design method for filtering antennas based on substrate integrated waveguide ( SIW) technology is proposed. A SIW filter is designed based on the traditional coupling matrix synthesis method, and then combined with half-mode substrate integrated waveguide (HMSIW) technology to obtain a filtering antenna. This method is simple and effective, and can introduce an additional transmission zero to improve the frequency selectivity of the filtering antenna. In this paper a third-order filtering antenna is taken as an example to verify the effectiveness of this method. Based on the TE101 mode, two SIW cavities and one HMSIW cavity are used to form a third-order filtering response. The SIW cavity is used as a high Q resonator, and the HMSIW cavity is also used as a radiation cavity. The measured center frequency is 6.52 GHz, with a -10 dB bandwidth of 7.4% (6.26 GHz to 6.74 GHz). The measured gain within the passband is basically 5 dBi, and a transmission zero is generated in the lower stopband, effectively improving the frequency selectivity of the filtering antenna at low frequencies. The measured results are in good agreement with the simulation results, verifying the effectiveness of the design method.