IEEE Microwave and Wireless Components Letters · 2020 · 22 citations · 12 references
EngineeringElectrical EngineeringAnalog ElectronicsMicroelectronicsMicrowave EngineeringImpedance MatchingMicrostrip CircuitsMicrowave FiltersMicrowave Integrated CircuitsMicrowave ResonatorsResonant CircuitsBand-pass FiltersBandpass FilteringBandpass FiltersBandwidthFractional BandwidthMicrowave Filter ResonatorsResistorsStripline Resonators
A novel dual-band balanced bandpass filter structure is constructed by utilizing patch resonators and meandered slotlines (MSLs). The center frequencies and passband bandwidths of two differential-mode (DM) passbands can be controlled independently. Specifically, the fractional bandwidth (FBW) in a lower band with the level of S11 better than 15 dB ranges from 2.9% to 19.1%, and the FBW in an upper band with the level of S11 better than 15 dB is from 2.0% to 13.9%. Furthermore, isolation resistors are added in the middle of the patch resonators to improve the common-mode (CM) suppression across the given frequency range. To verify the proposed filter concept, two dual-band balanced filters with different bandwidths are designed, fabricated, and measured.
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