Compact Ultra-Wideband (UWB) Bandpass Filter Using Dual-Stub-Loaded Resonator (DSLR)

A compact ultra-wideband (UWB) bandpass filter using dual-stub-loaded resonators (DSLR) is presented. The DSLR is analyzed by using the odd- and even- mode method. Four resonant modes can be tuned by the DSLR in 3.1 GHz - 10.6 GHz, and a pair of transmission zeros can be generated at the lower and upper stopband when the DSLR is applied to a UWB filter. Therefore a UWB bandpass filter is realized with good skirt selectivity, harmonic suppression, as well as compact size. Finally the proposed filter is simulated and fabricated. The measured results are in good agreement with the predicted one, demonstrating this structure is feasible in practical use.

[1]  Xiupu Zhang,et al.  Development of Packaged Ultra-Wideband Bandpass Filters , 2010, IEEE Transactions on Microwave Theory and Techniques.

[2]  Qunsheng Cao,et al.  Compact UWB Bandpass Filter With Improved Upper-Stopband Performance , 2009, IEEE Microwave and Wireless Components Letters.

[3]  Xiupu Zhang,et al.  Development of Packaged , 2010 .

[4]  Lei Zhu,et al.  Compact UWB Bandpass Filter Using Stub-Loaded Multiple-Mode Resonator , 2007, IEEE Microwave and Wireless Components Letters.

[5]  Qing-Xin Chu,et al.  Novel UWB Bandpass Filter Using Stub-Loaded Multiple-Mode Resonator , 2011, IEEE Microwave and Wireless Components Letters.

[6]  Qing-Xin Chu,et al.  Design of UWB Bandpass Filter Using Stepped-Impedance Stub-Loaded Resonator , 2010, IEEE Microwave and Wireless Components Letters.

[7]  Ke Wu,et al.  Broadband and compact multi-pole microstrip bandpass filters using ground plane aperture technique , 2002 .

[8]  W. Menzel,et al.  Compact microstrip bandpass filter with two transmission zeros using a stub-tapped half-wavelength line resonator , 2003, IEEE Microwave and Wireless Components Letters.

[9]  Lei Zhu,et al.  Capacitive-Ended Interdigital Coupled Lines for UWB Bandpass Filters With Improved Out-of-Band Performances , 2006, IEEE Microwave and Wireless Components Letters.

[10]  Qing-Xin Chu,et al.  Quintuple-Mode UWB Bandpass Filter With Sharp Roll-Off and Super-Wide Upper Stopband , 2011, IEEE Microwave and Wireless Components Letters.

[11]  Kaixue Ma,et al.  A Wideband and High Rejection Multimode Bandpass Filter Using Stub Perturbation , 2009, IEEE Microwave and Wireless Components Letters.