Wide Stopband Cross-Coupled SIW Filter Based on Tooth-Shaped Ground Defect
A low-pass transmission line structure with multi-level,tooth-shaped defects is proposed.The low-pass frequency and attenuation-band range could be effectively adjusted by varying the length of the branch of atooth-shaped defect.A wide-stopband filter with high out-of-band suppression was designed by cascading cross-coupled fan-shaped SIW filters using this tooth-shaped defect ground structure.Compared to traditional SIW bandpass fil-ters,the rectangular coefficient,K40 dB,had a value of two,and the stopband range was greater than twice the cen-ter frequency,demonstrating good passband and stopband selection characteristics.The test results showed that the filter's center frequency was 10.35 GHz,with 3 dB and 40 dB bandwidths of 507 MHz and 1.05 GHz,respectively.The insertion loss was better than 1.47 dB,which was consistent with the simulation results.
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