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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...
A compact ultra-wideband (UWB) antenna with sharp band-notched characteristics and controllable notched bandwidth is presented. The proposed antenna consists of an inverted U-shaped slot on the ground plane and a radiation patch similar to the slot which is fed by a 50-Ω microstrip line. By slitting an inverted U-shaped slot on the radiation patch and embedding an inverted U-shaped strip near the...
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,...
Design, fabrication and measurement of a filtering antenna are presented for WLAN / WIFI/ LTE communication systems in this paper. The filtering antenna consists of a feeding network, half-wavelength (λ/2) uniform impedance resonator (UIR) with a cambered structure and an annular slot. UIR with cambered structure is employed as the first stage resonator to improve the frequency selectivity in necessary...
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...
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...
Design, fabrication and measurement of a filtering antenna are presented for WLAN / WIFI/ LTE communication systems in this paper. The filtering antenna consists of a feeding network, half-wavelength (λ/2) uniform impedance resonator (UIR) with a cambered structure and an annular slot. UIR with cambered structure is employed as the first stage resonator to improve the frequency selectivity in necessary...
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 ultra-wideband (UWB) antenna with sharp band-notched characteristics and controllable notched bandwidth is presented. The proposed antenna consists of an inverted U-shaped slot on the ground plane and a radiation patch similar to the slot which is fed by a 50-Ω microstrip line. By slitting an inverted U-shaped slot on the radiation patch and embedding an inverted U-shaped strip near the...
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 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 dual-band bandpass filter with wide stopband based on stepped impedance resonators has been presented. The proposed filter consists of two quarter-wavelength modified SIRs which share a common grounded via-hole and two symmetrical open-end stubs. This structure without the open-end stubs can generate four transmission zeros (TZs) to achieve strong passband selectivity and the additional...
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 ultra-wideband (UWB) Wilkinson power divider with step impedance resonators (SIR) was presented in this paper. It was working in the ultra wide frequency band (3.1GHz – 10.6GHz) by modifying the traditional two sections Wilkinson power divider. The simulation results of the power divider shows a good performance. The insertion loss is less than ldB, the return loss of in port is less than −11.5dB,...
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