论文信息 - Novel Dual-Mode Balun Bandpass Filters Using Single Cross-Slotted Patch Resonator

Novel Dual-Mode Balun Bandpass Filters Using Single Cross-Slotted Patch Resonator

In this letter, a novel dual-mode bandpass balun filter is presented using a miniaturized cross-slotted patch resonator. This balun filter consists of a single slit-loaded patch etched by a pair of cross slots and a stepped-impedance open stub. An unbalanced input port is orthogonally arranged in-between two balanced output ports along the patch, and each feed line is connected to an additional stub for enhanced coupling. Due to the dual-mode characteristic of the patch resonator, two transmission poles can be easily constructed at both balanced passbands. Asymmetrical width and length of the cross-loaded slots perturb the field of the patch and excite two degenerate modes simultaneously, while the attached open-circuited stub provides an additional degree of freedom for performance tuning. Finally, two prototype balun filters are designed and fabricated at 3.48 and 1.80 GHz, respectively. Measured results achieve good filtering and balun performance and agree well with those from simulations.

W. Menzel | Sheng Sun | W. Menzel | Sheng Sun

[1] Ke-Li Wu,et al. An LTCC balanced-to-unbalanced extracted-pole bandpass filter with complex load , 2006 .

[2] Shih-Yuan Chen,et al. Balanced-to-Unbalanced Bandpass Filters and the Antenna Application , 2008, IEEE Transactions on Microwave Theory and Techniques.

[3] Eul-Young Jung,et al. A Balun-BPF Using a Dual Mode Ring Resonator , 2007, IEEE Microwave and Wireless Components Letters.

[4] P. Heide,et al. Implementation of a miniaturized lumped-distributed balun in balanced filtering for wireless applications , 2005, 2005 European Microwave Conference.

[5] Lei Zhu,et al. Miniaturized dual-mode bandpass filter using inductively loaded cross-slotted patch resonator , 2005, IEEE Microwave and Wireless Components Letters.

[6] Yo-Shen Lin,et al. Analysis and Design of New Single-to-Balanced Multicoupled Line Bandpass Filters Using Low-Temperature Co-Fired Ceramic Technology , 2008, IEEE Transactions on Microwave Theory and Techniques.

[8] W. R. Eisenstadt,et al. Microwave differential circuit design using mixed-mode S-parameters , 2006 .

[9] Wai-Wa Choi,et al. A Compact Microstrip Square-Loop Dual-Mode Balun-Bandpass Filter With Simultaneous Spurious Response Suppression and Differential Performance Improvement , 2011, IEEE Microwave and Wireless Components Letters.

[10] Ke Wu,et al. New planar dual-mode filter using cross-slotted patch resonator for simultaneous size and loss reduction , 1999 .