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Two novel compact ultra-wideband (UWB) bandpass filter is developed by using two kinds of stub-loaded triple-mode resonator doublets. The proposed doublet consists of two parallel but oppositely arranged stub-loaded resonators. An UWB filter is designed by cascading three doublets, and eleven transmission poles are obtained in its passband. The high-orders filter has a passband covering 3.4–10.4 GHz,...
This paper proposes a compact bandpass filter with excellent out-of-band performance. Stepped-impedance resonators (SIRs) are used to achieve an extended rejection bandwidth. Loaded stubs are also introduced to suppress the harmonic responses. The SIRs and the loaded stubs take up little extra room, and thus the proposed filter has a compact size. In this paper, a bandpass filter centered at 2 GHz...
A transmission-line bandpass filter based on bandstop filter is proposed in this paper. A key merit of the filter configuration is that the position of the transmission zeros can be conveniently controlled whereas the bandwidth is fixed. The bandpass filter consists of two half-wavelength resonators, two open circuited uniform impedance resonators and one stepped impedance resonator. With five reflection...
A novel short-circuited stubs loaded λ/4 resonator and its application to third-order dual-band bandpass filter are presented in this paper. Based on the analysis of resonance characteristics, it is found that the characteristics of the first passband can be conveniently controlled by the two loading shunt stubs, whereas that of the second passband are fixed. A third-order dual-band bandpass filter...
A wideband balanced bandpass filter with three layers is presented in this paper. In differential mode, the microstrip layers are back-to-back short-circuited SIR, which form the differential passband with the slot resonators, meanwhile introducing two transmission zeros out of the passband. Whereas, the back-to-back SIR resonates outside the differential band in common-mode and produce a transmission...
Compact quad-channel diplexer (2.5/3.5GHz and 3/4GHz) using meandering short stub loaded resonators is proposed. The quad-channel diplexer is composed of two pairs of coupled short stub loaded resonators to obtain independently controlled bandwidth at each passband and to reduce the circuit size. In addition, the mixed electric and magnetic coupling is employed to create a desired transmission zero...
A new compact filtering rat-race coupler is implemented by a 2×2 cross coupled configuration based on compact miniaturized hairpin resonators. Passband responses with transmission zeros are synthesized by an (n+4)×(n+4) coupling matrix. The zeros are created in the output ports by adding source-load coupling and their analytical expressions are derived. An experimental circuit is fabricated and measured...
This paper presents the design of compact balanced-to-unbalanced (balun) bandpass filters (BPFs) using the low temperature co-fired ceramic (LTCC) technology. Three coupled half wavelength transmission-line are used to form the proposed circuit. The balun filter is designed to work at the center frequency of 5.5GHz with the fractional bandwidth of 9.8%. The size of the circuit is only 2.2mm*2.7mm*1...
Two SIW bandpass filters (BPFs) are presented using rectangular cavities and loaded posts for 5.8GHz WLAN system using rectangular cavity and loaded posts. Except that both of them use two rectangular cavities to create a passband, they are different in setting the feed-line locations. In design, two loaded posts are introduced as inductive coupling elements to restrain the fundamental resonant mode...
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