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In this paper, a compact bandpass filter (BPF) with improved stopband characteristics using novel stepped impedance resonators (SIRs) is proposed. The conventional low-impedance stub of SIR is replaced by radial stubs, owing to its intrinsic wide stopband characteristics; the stopband rejection can be widened. A new BPF centered at 1.57 GHz has been designed and fabricated to verify the validity of...
In this paper, a compact fourth-order cascade quadruplet (CQ) passband filter (BPF) with improved selectivity is proposed based on the dual-metal-plane structure. To further improve the selectivity, more finite frequency transmission zeros (TZs) can be employed via introducing mixed electric/magnetic (EM) coupling in the cross-coupled arm between the nonadjacent resonators of the conventional CQ filter...
A compact third-order bandpass filter (BPF) with enhanced stopband characteristics is proposed in this paper. The filter consists of two stepped impedance resonators (SIRs) and a new resonator named closed loop SIR. The closed loop SIR which is embedded into the other two resonators for compact size is not the real structure of SIR, but it is similar to the conventional λ/4 SIR in some characters...
A compact third-order bandpass filter (BPF) with enhanced stopband characteristics is proposed in this paper. The filter consists of two stepped impedance resonators (SIRs) and a new resonator named closed loop SIR. The closed loop SIR which is embedded into the other two resonators for compact size is not the real structure of SIR, but it is similar to the conventional λ/4 SIR in some characters...
In this paper, a compact bandpass filter (BPF) with improved stopband characteristics using novel stepped impedance resonators (SIRs) is proposed. The conventional low-impedance stub of SIR is replaced by radial stubs, owing to its intrinsic wide stopband characteristics; the stopband rejection can be widened. A new BPF centered at 1.57 GHz has been designed and fabricated to verify the validity of...
In this paper, a compact fourth-order cascade quadruplet (CQ) passband filter (BPF) with improved selectivity is proposed based on the dual-metal-plane structure. To further improve the selectivity, more finite frequency transmission zeros (TZs) can be employed via introducing mixed electric/magnetic (EM) coupling in the cross-coupled arm between the nonadjacent resonators of the conventional CQ filter...
A compact bandpass filter (BPF) with enhanced stopband characteristics is presented in this paper. The proposed BPF consists of four improved stepped impedance resonators (SIRs),which implements into a box-section strcture. To improve the frequency selectivity and the stopband characteristics, additional transmission zero (TZ) was introduced by mixed electric and magnetic (EM) coupling. A new filter...
A compact tri-band bandpass filter (BPF) using tri-section stepped impedance resonators (SIRs) with short loaded stubs is presented. In this letter, the second passband frequency of the tri-band filter can be flexibly controlled by tuning the tri-section SIRs, and the first and the third passband frequencies of the tri-band filter can be obtained by adjusting the parameters of the tri-section SIRs...
A new compact bandpass filter(BPF) with improved out-of-band performance is presented in this paper. The proposed BPF consists of two non-adjacent stepped impedance resonators (SIRs), which shared a common grounded via-hole. To improve the stopband characteristics, a π type capacitive circuit is introduced in the filter. The location of the transmission zeros can be controlled by adjusting the strength...
A compact fourth-order bandpass filter with good frequency selectivity is presented. The proposed BPF consists of four cascaded stepped impedance resonators (SIRs). Mixed electric/magnetic (E/M) coupling are introduced in the proposed filter to generate transmission zeros (TZs) near the passband for sharp frequency selectivity. The method on the generation of transmission zeros caused by mixed coupling...
A compact bandpass filter with wide stopband using stepped impedance resonators has been designed and fabricated. And open ended stubs for frequency fine tuning are introduced. The new passband filter was analyzed, simulated and fabricated. Measured results are in good agreement with the electromagnetic simulation results. Moreover the circuit only occupies 20.1 × 17.1 mm2(≈0.21 λg × 0.16λg).
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