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Novel Broadside-Coupled Bandpass Filters Using Both Microstrip and Coplanar-Waveguide Resonators

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3 Author(s)
Pu-Hua Deng ; Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei ; Chi-Hsueh Wang ; Chun Hsiung Chen

Novel quasi-elliptic coupled-resonator bandpass filters with wider fractional bandwidth are proposed. By using the broadside-coupled mechanism to couple the half-wavelength microstrip resonators and the quarter-wavelength coplanar-waveguide (CPW) resonators together with introducing two CPW shorted stubs, the required mixed and magnetic couplings associated with the resonators may be enhanced so that a wider bandwidth cross-coupled filter may be realized. Specifically, a fourth-order quasi-elliptic broadside-coupled bandpass filter with a center frequency at f0=1.48 GHz, a minimum insertion loss of 0.68 dB, and a wider 3-dB fractional bandwidth of 34.6% is implemented, and its stopband is extended up to 6 GHz (4f0) with a rejection better than 20 dB

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:54 ,  Issue: 10 )