A Trisection Filter Design With Negative Slope of Frequency-Dependent Crosscoupling Implemented in Substrate Integrated Waveguide (SIW)

This letter reports on a novel realization of a microwave bandpass filter in a triplet configuration with a frequency-dependent crosscoupling implemented in substrate integrated waveguide (SIW). The design involves implementing dispersive coupling with a negative slope, a feature that allows the capabilities of the classic triplet topology to be extended. In this particular case, the implementation of two transmission zeros on the upper stopband is considered. The dispersive coupling with negative slope in SIW is achieved with a coupling with a positive slope whose sign is inverted using balanced line theory. The filter was fabricated in SIW technology, and good agreement was achieved between the simulated results and those measured.

[1]  Wei Meng,et al.  Synthesis of Wideband Multicoupled Resonators Filters , 2011, IEEE Transactions on Microwave Theory and Techniques.

[2]  Kuo-Sheng Chin,et al.  Cross-coupled bandpass filters using QMSIW cavities and S-shaped slot coupling structures , 2013 .

[3]  A. Panariello,et al.  Ku-Band high power dielectric resonator filters , 2012, IMS 2012.

[4]  W. Yin,et al.  Novel Substrate Integrated Waveguide Filters With Mixed Cross Coupling (MCC) , 2009, IEEE Microwave and Wireless Components Letters.

[5]  A. Lamecki,et al.  A Substrate Integrated Waveguide (SIW) Bandpass Filter in A Box Configuration With Frequency-Dependent Coupling , 2012, IEEE Microwave and Wireless Components Letters.

[6]  Ke-Li Wu,et al.  Stepped Circular Waveguide Dual-Mode Filters for Broadband Contiguous Multiplexers , 2013, IEEE Transactions on Microwave Theory and Techniques.

[7]  Ke Wu,et al.  Substrate Integrated Waveguide Cross-Coupled Filter With Negative Coupling Structure , 2008, IEEE Transactions on Microwave Theory and Techniques.

[8]  R. Cameron.  Advanced coupling matrix synthesis techniques for microwave filters , 2003 .

[9]  Smain Amari,et al.  Theory of Coupled Resonator Microwave Bandpass Filters of Arbitrary Bandwidth , 2010, IEEE Transactions on Microwave Theory and Techniques.

[10]  R. J. Wenzel.  Exact Design of Wideband Equal-Ripple Bandpass Filters with Non-Adjacent Resonator Couplings , 1976 .

[11]  Lukasz Szydlowski,et al.  A Novel Synthesis Technique for Microwave Bandpass Filters with Frequency-Dependent Couplings , 2013 .

[12]  Jens Bornemann,et al.  Using frequency-dependent coupling to generate finite attenuation poles in direct-coupled resonator bandpass filters , 1999 .

[13]  P. Kozakowski,et al.  Eigenvalue approach to synthesis of prototype filters with source/load coupling , 2005, IEEE Microwave and Wireless Components Letters.

[14]  Ke Wu,et al.  Cross-Coupled Substrate Integrated Waveguide Filters With Improved Stopband Performance , 2012, IEEE Microwave and Wireless Components Letters.

[15]  Ralph Levy,et al.  New cascaded trisections with resonant cross-couplings (CTR sections) applied to the design of optimal filters , 2004, 2004 IEEE MTT-S International Microwave Symposium Digest (IEEE Cat. No.04CH37535).

[16]  A. Lamecki,et al.  Coupled-Resonator Filters With Frequency-Dependent Couplings: Coupling Matrix Synthesis , 2012, IEEE Microwave and Wireless Components Letters.

[17]  A. Lamecki,et al.  Coupled-Resonator Waveguide Filter in Quadruplet Topology With Frequency-Dependent Coupling – A Design Based on Coupling Matrix , 2012, IEEE Microwave and Wireless Components Letters.