A Stopband-Expanded Low-Pass Filter with Five Transmission Zeros

2012 ◽  
Author(s):  
Zhi-Hao Zhang ◽  
Lin Li ◽  
Qing-Hua Wu ◽  
Kai-Yu Zhao ◽  
Jin Li
Keyword(s):  
Pass Filter ◽  
Low Pass Filter ◽  
Transmission Zeros ◽  
Low Pass

scholarly journals Compact D-CRLH resonator for low-pass filter with wide rejection band, high roll-off, and transmission zeros

2018 ◽  
Vol 11 (5-6) ◽  
pp. 509-516 ◽  
Author(s):  
Dilip Kumar Choudhary ◽  
Mahmoud A. Abdalla ◽  
Raghvendra Kumar Chaudhary
Keyword(s):  
Filter Design ◽  
Short Circuit ◽  
Tank Circuit ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Filter Bandwidth ◽  
Transmission Zeros ◽  
Low Pass ◽  
Lc Tank ◽  
Rejection Band

AbstractA compact low-pass filter (LPF) with wide rejection band based on T-type circuit of an enhanced dual composite right-/left-handed (D-CRLH) resonator is presented in this paper. The resonator has only one cell with series and parallel tank circuit. The parallel LC tank circuit has been realized by an interdigital capacitor and one shorted finger, whereas its series LC tank circuit is realized by an air gap capacitance and a short circuit stub. The filter has wide rejection band bandwidth with three transmission zeros (TZs). The filter bandwidth and TZs frequencies are controlled by the D-CRLH element values. The results of the proposed filter demonstrate minimum insertion loss in passband, high roll-off rate, and good figure of merit. The measured results are in good agreement with the simulated results. The detailed filter design is discussed in terms of circuit modeling, dispersion analysis, and full-wave simulation. Finally, the filter size is compact (0.10 λg × 0.15 λg) at cut-off frequency.

scholarly journals Stopband-Extended and Size-Miniaturized Low-Pass Filter with Three Transmission Zeros

ETRI Journal ◽  
2014 ◽  
Vol 36 (2) ◽  
pp. 286-292 ◽  
Author(s):  
Lin Li ◽  
Jia Bao ◽  
Jing-jing Du ◽  
Yaming Wang
Keyword(s):  
Pass Filter ◽  
Low Pass Filter ◽  
Transmission Zeros ◽  
Low Pass

Stopband-Extended and Size-Miniaturized Low-Pass Filter Based on Interdigital Capacitor Loaded Hairpin Resonator with Four Transmission Zeros

Frequenz ◽  
2018 ◽  
Vol 72 (5-6) ◽  
pp. 221-226 ◽  
Author(s):  
Jia-Jia Wu ◽  
Lin Li
Keyword(s):  
Transmission Line ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Interdigital Capacitor ◽  
Transmission Zeros ◽  
High Impedance ◽  
Compact Size ◽  
Low Pass ◽  
Hairpin Resonator

AbstractIn this paper, a compact low-pass filter (LPF) with wide stopband is proposed based on interdigital capacitor loaded hairpin resonator. The structure composed of an upper high-impedance transmission line, a middle interdigital capacitor, and a pair of inter-coupled symmetrical stepped-impedance stubs. Detailed investigation into this structure based on even-odd mode approach reveals that up to four transmission zeros can be generated and reallocated by choosing the proper circuit parameters. And owing to the aid of transmission zeros, the fabricated quasi-elliptic LPFs experimentally demonstrate a wide 20dB stopband from 1.4fcto 5.1fcusing a compact size of only 0.005 λg2.

scholarly journals Design of a Wide-Band Microstrip Filtering Antenna with Modified Shaped Slots and SIR Structure

Inventions ◽  
2020 ◽  
Vol 5 (1) ◽  
pp. 11 ◽  
Author(s):  
Yasir I. A. Al-Yasir ◽  
Hana’a A. Alhamadani ◽  
Ahmed S. Kadhim ◽  
Naser Ojaroudi Parchin ◽  
Ameer L. Saleh ◽  
...  
Keyword(s):  
High Speed ◽  
Design Procedure ◽  
Wide Band ◽  
Impedance Bandwidth ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Transmission Zeros ◽  
Low Pass ◽  
High Speed Data ◽  
Good Agreement

This paper presents a new compact microstrip filtering antenna with modified shaped slots to improve the impedance bandwidth. The proposed microstrip filtering antenna consists of three parts: the monopole radiating patch antenna; the Stepped Impedance Resonator (SIR) filter; and the feeding microstrip line. The designed structure is achieved on one-sided glass epoxy FR-4 substrate with dielectric constant εr = 4.4 and thickness h = 1.6 mm. The design procedure of the proposed filtering antenna starts from the second-order Chebyshev low pass filter (LPF) prototype. The achieved results show an excellent performance of S11-parameter with broadside antenna gain on +z-direction. Having two transmission zeros at 5.4 GHz and 7.7 GHz, good skirt selectivity and a wide-band impedance bandwidth of about 1.66 GHz makes the designed filtering antenna suitable for high-speed data communications. Both the simulation results generated by using the Computer Simulation Technology (CST) software package and the measurement achieved by using a vector network analyzer (HP 8510C) and the anechoic chamber show good agreement.

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