Waveguide filter with broad stopband based on sugstrate...

Details Waveguide filter with broad stopband based on sugstrate... Waveguide filter with broad stopband based on sugstrate...

H - Electricity

01

P

H01P 1/201 (2006.01)

Patent

CA 2629035

A waveguide bandpass filter utilizing a substrate integrated waveguide (SIW) scheme is provided with wide stopband performance and low in-band insertion loss at microwave and millimetre-wave frequencies. The filter consists of cascaded oversized substrate integrated waveguide cavities, and at least one transmission line of either microstrip, stripline or coplanar waveguide with coupling slots is used as the input/output. The transmission zeros generated by the non-physical cross-couplings through the higher-order modes in the oversized substrate integrated waveguide cavity are assigned to improve the stopband performance. This filter is very easy to integrate with planar circuits for microwave and millimetre-wave applications. Three typical implementations of this filter are illustrated on a general dielectric substrate using linear arrays of metallised via holes by a standard PCB process. These three typical implementations operate at a center frequency of 20.2 GHz, although other center frequencies, such as approximately 5 GHz to approximately 60 GHz, are achievable.

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