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This paper presents two miniaturized LTCC bandpass filters with wide stopband. By selecting suitable coupling region, the discriminating coupling mechanism is realized, which can suppress harmonics without impact on passband performance. Based on the scheme, two bandpass filters are designed. The first one realizes third harmonic suppression in coupling region between feeding line and resonator. The...
A novel class of microstrip bandpass filters with increased upper rejection band is proposed. Coupling properties between the microstrip resonators and feed lines are analyzed via voltage-wave functions. Suppressions of second and third harmonics can be achieved by proper selection of coupling regions. Using two half-wavelength resonators with and without centrally-loaded resistors, two experimental...
A compact wideband bandpass filter (BPF) is presented and experimentally validated in this letter. The described filter consists of microstrip resonator and CPW resonator designed on different layers, has compact size and strong coupling strength and then achieves good wideband performance. By adjusting the coupling electric length between resonators and the adding trapeze-form patch, good harmonic...
In this paper, the design of a compact planar bandpass filter above a defected ground plane is presented. The filter is designed as a combination of microstrip resonators and exploits the properties of a planar electromagnetic bandgap (EBG) structure patterned unto the ground plane of the printed circuit board material to provide a very wide stopband of up to 5 times the fundamental frequency. The...
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