A tunable bandpass filter based on a technique that utilizes substrate integrated waveguide (SIW) and double coupling is presented. The SIW based bandpass filter is implemented using a bowtie shaped resonator structure. The bowtie shaped filter exhibits similar performance as found in rectangular and circular shaped SIW based bandpass filters. This concept reduces the circuit foot print of SIW; along with miniaturization high quality factor is maintained by the structure. The design methodology for single-pole triangular resonator structure is presented. Two different inter-resonator couplings of the resonators are incorporated in the design of the two-pole bowtie shaped SIW bandpass filter, and switching between the two couplings using a packaged RF MEMS switch delivers the tunable filter. A tunning of 1 GHz is achieved for two frequency states of 6.3 and 7.3 GHz. The total size of the circuit is 70mm x 36mm x 0.787 mm (LxWxH).
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机译：提出了一种基于利用衬底集成波导（SIW）和双耦合技术的可调带通滤波器。基于SIW的带通滤波器是使用领结形谐振器结构实现的。领结形滤波器表现出与基于矩形和圆形SIW的带通滤波器相似的性能。这个概念减少了SIW的电路足迹；伴随着小型化，该结构保持了高品质因数。提出了单极三角谐振器结构的设计方法。双极领结形SIW带通滤波器的设计中包含了谐振器的两个不同的谐振器间耦合，并且使用封装的RF MEMS开关在两个耦合之间进行切换可提供可调滤波器。对于6.3和7.3 GHz的两个频率状态，可实现1 GHz的调谐。电路的总尺寸为70mm x 36mm x 0.787 mm（LxWxH）。
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