Stepped impedance resonator bandpass filters using tapped-line for controlling spurious response

2004 ◽  
Vol 40 (6) ◽  
pp. 481-484 ◽  
Author(s):  
Min-Hung Weng ◽  
Wu-Nan Chen ◽  
Tsung-Hui Huang ◽  
Cheng-Yuan Hung ◽  
Hung-Wei Wu
Keyword(s):  
Bandpass Filters ◽  
Stepped Impedance Resonator ◽  
Spurious Response

scholarly journals Compact Ultra-Wideband Bandpass Filters Achieved by Using a Stub-Loaded Stepped Impedance Resonator

Electronics ◽  
2020 ◽  
Vol 9 (2) ◽  
pp. 209 ◽  
Author(s):  
Min-Hang Weng ◽  
Fu-Zhong Zheng ◽  
Hong-Zheng Lai ◽  
Shih-Kun Liu
Keyword(s):  
Resonant Mode ◽  
Bandpass Filters ◽  
Ultra Wideband ◽  
Design Parameters ◽  
Transmission Zeros ◽  
Notch Band ◽  
Resonant Modes ◽  
Attenuation Level ◽  
Stepped Impedance Resonator ◽  
5 Ghz

In this paper, we develop a bandpass filter using a stub-loaded stepped impedance resonator (SLSIR) and calculate the even and odd resonant modes of this type of resonator using the input impedance/admittance analysis. In this study, two impedance ratios and two length ratios are operated as the design parameters for controlling the resonant modes of the SLSIR. Several resonant mode variation curves operating three resonant modes with different impedance ratios and two length ratios are developed. By tuning the desired impedance ratios and length ratios of the SLSIRs, compact ultra-wideband (UWB) bandpass filters (BPFs) can be achieved. Two examples of the UWB BPFs are designed in this study. The first example is UWB filter with a wide stopband and the second one is dual UWB BPF, namely, with UWB performance and a notch band. The first filter is designed for a UWB response from 3.1 to 5.26 GHz having a stopband from 5.3 to 11 GHz, with an attenuation level better than 18 dB. The second filter example is a dual UWB BPF with the frequency range from 3.1 to 5 GHz and 6 to 10.1 GHz using two sets of the proposed SLSIR. The measured results have insertion loss of less than 1 dB, and return loss greater than 10 dB. Furthermore, the coupling structures and open stub of the SLSIR also provide several transmission zeros at the skirt of the passbands for improving the passband selectivity.

Tri‐band bandpass filters using modified tri‐section stepped impedance resonator with improved selectivity and wide upper stopband

2013 ◽  
Vol 7 (15) ◽  
pp. 1187-1193 ◽  
Author(s):  
Rowdra Ghatak ◽  
Manimala Pal ◽  
Pankaj Sarkar ◽  
Amit Kumar Aditya ◽  
Dipak Ranjan Poddar
Keyword(s):  
Bandpass Filters ◽  
Stepped Impedance Resonator
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