A Design Method for Filtering Antenna Based on SIW Technology
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 in-troduce an additional transmission zero to improve the frequency selectivity of the filtering antenna.In this paper a third-order filte-ring 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 cavi-ty 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 agree-ment with the simulation results,verifying the effectiveness of the design method.
substrate integrated waveguidehalf-mode substrate integrated waveguidefiltering antennatransmission zero
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