Abstract
AbstractThe paper presents a dual‐wideband bandpass filter using multilayer broadside‐coupled microstrip‐coplanar waveguide (CPW) structure. The half‐wavelength stepped‐impedance resonators at the top and bottom layers are broadside coupled in the vertical direction through a CPW‐multimode resonator (CPW‐MMR) at the mid layer, which forms a mixed MMR. The ultra‐wideband obtained from tight coupling is split into two passbands by introducing extra transmission zeros, good impedance matching is achieved by adopting open‐ended microstrip stubs on the input and output microstrip feed lines, and the dual‐wideband characteristic is realized. The proposed filter is small in size, and its operation bands and the bandwidth of the stopband are adjustable. Both experiments and computer simulations were conducted, and the measured results are in good agreement with the simulation results.
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