Electromagnetic waves · 2007 · 61 citations · 13 references
EngineeringElectrical EngineeringMicroelectromechanical SystemsMicrowave EngineeringResponsive DesignMicrostrip CircuitsMicrowave FiltersMicrowave Integrated CircuitsMicrowave ResonatorsResonance In CircuitsResonant CircuitsBandpass FilteringBandpass FiltersDual-mode FiltersMicrostrip Bandpass FiltersMicrostrip FiltersMicrostrip ResonatorsMode SplittingSize
A new dual-mode microstrip bandpass filter with wide stop-band is presented using the square loop resonator with treeshaped patches attached to the four inner corners of the loop. The mode splitting is realized by introducing a small cut locating at a 45 offset from its two orthogonal modes. It is shown that the dual-mode filter has a wide stop-band including the first spurious resonance frequency. The center frequency can be tuned. Moreover, the proposed filter has a smaller size compared with conventional dualmode bandpass filters at the same central frequency.
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