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A new miniaturized dual-mode dual-band ring resonator bandpass filter is implemented by a cascade of several microwaveC-sections. EachC-section is used to substitute a transmission line section of designated electrical length. Through proper design of input/output coupling configuration, two transmission zeros can be created on both sides of each passband. Two circuits with four and six microwaveC-sections are fabricated for confirmation. They occupy less than 30% of the area of a traditional ring resonator filter. Measured responses agree very well with the simulation.
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Chiou et al. (2010) studied this question.
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