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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 dual-band bandpass filter (BPF) with improved stopband characteristics using stepped impedance resonators (SIRs) is presented. Multiple transmission zeros can be realized near the passbands of proposed filter by the cancelling effects of mixed electric and magnetic couplings. Dualband can be achieved by combining two sets of independent resonators with common input/output ports. A 2.4/5...
A modified λ /4 stepped impedance resonator (SIR) is proposed, in which a shunt open stub is loaded between the low impedance line and high impedance line of a conventional λ /4 SIR. Based on this modified λ/4 SIR a compact dual-band bandpass filter (BPF) with high selectivity is presented. Two transmission zeros (TZs) are generated near each passband for high selectivity. To demonstrate this method,...
A compact dual-band bandpass filter (BPF) with improved stopband characteristics using stepped impedance resonators (SIRs) is presented. Multiple transmission zeros can be realized near the passbands of proposed filter by the cancelling effects of mixed electric and magnetic couplings. Dualband can be achieved by combining two sets of independent resonators with common input/output ports. A 2.4/5...
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 modified λ /4 stepped impedance resonator (SIR) is proposed, in which a shunt open stub is loaded between the low impedance line and high impedance line of a conventional λ /4 SIR. Based on this modified λ/4 SIR a compact dual-band bandpass filter (BPF) with high selectivity is presented. Two transmission zeros (TZs) are generated near each passband for high selectivity. To demonstrate this method,...
A modified tri-mode stepped impedance resonator (SIR) is proposed, in which a shunt open stub is loaded in the conventional tri-section SIR. The resonant frequencies and frequency ratios can be properly controlled by adjusting the loaded open stub. A compact second-order tri-band bandpass filter (BPF) based on two coupled proposed open stub loaded tri-section SIR...
This paper presents a compact lowpass filter (LPF) with wide stop-band. The LPF is realized by a compact microstrip resonant cell (CMRC) and shunt folded open stubs. Wide stopband characteristics can be achieved by introducing transmission zeros into the stopband. Measured results of the fabricated prototype show that the insertion loss is less than 1.5 dB (DC-10GHz) and stopband bandwidth better...
A new efficient welding method, Consumable DE-GMAW was proposed. According to the many problems occurred when the welding process is open-loop, such as instability of the welding process and a large welding spatter, etc. A real-time target hardware platform was built for consumable DE-GMAW based on xPC, and a rapid prototyping control system was also developed for consumable DE-GMAW with the Matlab/Simulink...
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