High selective compact dual‐band filter using ring resonator with quarter‐wavelength stubs

2017 ◽  
Vol 53 (24) ◽  
pp. 1589-1591 ◽  
Author(s):  
Yatao Peng ◽  
Lijun Zhang ◽  
Zhanqi Zheng ◽  
Yongqing Leng
Keyword(s):  
Ring Resonator ◽  
Dual Band ◽  
Quarter Wavelength ◽  
Band Filter

Dual-band filter design of combined half and quarter wavelength SIRs for WLAN applications

2007 ◽  
Vol 50 (1) ◽  
pp. 13-15 ◽  
Author(s):  
Pow-Wen Chen ◽  
Hao-Hung Ho ◽  
Min-Hua Ho ◽  
Ching-Her Lee
Keyword(s):  
Filter Design ◽  
Dual Band ◽  
Quarter Wavelength ◽  
Band Filter

scholarly journals An Improved Stopband Dual-Band Filter Using Quad-Mode Stub-Loaded Resonators

Electronics ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 142
Author(s):  
Min-Hang Weng ◽  
Chun-Yueh Huang ◽  
Shi-Wei Dai ◽  
Ru-Yuan Yang
Keyword(s):  
High Performance ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Design Procedure ◽  
Local Area ◽  
Dual Band ◽  
Area Network ◽  
Quarter Wavelength ◽  
Band Filter ◽  
Insertion Losses

In this paper, we present a dual-band microstrip bandpass filter (BPF) with an improved stopband, which was constructed by a quad-mode stub-loaded resonator (SLR). Since the SLR is able to produce multiresonance within a single unit, the area saving is significant. The proposed quad-mode SLR was implemented by two stubs allocated at symmetry places, thus the even-/odd-mode can be applied to analysis the resonance. Moreover, to shift the spurious passband, the step impedance structure was applied to shift the harmonic resonance to the higher frequency. Design procedure for high performance dual-band BPF is proposed, and filter examples were designed for wireless local area network (WLAN) of 2.4/5.2 GHz. The measured insertion losses, return losses and fractional bandwidths (FBW) are 1.43 dB, 10 dB, and 14.8% at 2.4 GHz and 1.34 dB, 10 dB, and 12.9% at 5.2 GHz. Moreover, by applying two quarter-wavelength stubs on the input/output ports, the passband selectivity with an isolation of 40 dB can be achieved. The simulation and measurement have a close match, verifying the design concept.

scholarly journals A Novel Dual-Mode Dual-Band Bandpass Filter Based on a Single Ring Resonator

2020 ◽  
Vol 20 (2) ◽  
pp. 91-95
Author(s):  
Youngje Sung
Keyword(s):  
Resonant Frequency ◽  
Circular Hole ◽  
Bandpass Filter ◽  
Ring Resonator ◽  
Dual Band ◽  
Mode Structure ◽  
Dual Mode ◽  
Band Filter ◽  
Single Ring ◽  
Mode Characteristic

In this paper, a dual-mode bandpass filter that operates in two different bands is proposed. A circular patch with a small circular hole is set as the basic resonator, and, as the circular hole moves, the linewidth of the ring resonator becomes non-uniform. Consequently, the ring resonator is structurally asymmetric and exhibits a dual-mode characteristic. A gap is formed in the middle of the resonator, a pair of inductors and capacitors is applied to the gap, and the proposed dual-mode structure operates as a dual-band filter. The first resonant frequency <i>f</i><sub>1</sub> is determined by the inductor and capacitor values, and the second resonant frequency <i>f</i><sub>2</sub> is determined by the capacitor values. In addition, the frequency ratio (<i>f</i><sub>2</sub>/<i>f</i><sub>1</sub>) can be adjusted by an appropriate combination of inductor and capacitor values.

scholarly journals TRANSMISSION ZERO DESIGN GRAPH FOR DUAL-MODE DUAL-BAND FILTER WITH PERIODIC STEPPED-IMPEDANCE RING RESONATOR

2010 ◽  
Vol 108 ◽  
pp. 23-36 ◽  
Author(s):  
Yi-Chyun Chiou ◽  
Ping-Shiang Yang ◽  
Jen-Tsai Kuo ◽  
Cho-Yuh Wu
Keyword(s):  
Ring Resonator ◽  
Dual Band ◽  
Dual Mode ◽  
Transmission Zero ◽  
Band Filter
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