Hostname: page-component-76fb5796d-22dnz Total loading time: 0 Render date: 2024-04-27T04:01:51.914Z Has data issue: false hasContentIssue false
  • English
  • Français

Miniaturized dual-band filter with return loss bandwidth and transmission zero control

Published online by Cambridge University Press:  10 February 2017

Di Lu ,
N. Scott Barker  and
Xiao-Hong Tang
Di Lu*
Affiliation:
School of Electronic Engineering, University of Electronic Science and Technology of China (UESTC), Qingshuihe Campus: No. 2006, Xiyuan Avenue, West Hi-Tech Zone, Chengdu, Sichuan, China Charles L. Brown Department of Electrical and Computer Engineering, University of Virginia, 351 McCormick Road, Charlottesville, VA, USA
N. Scott Barker
Affiliation:
Charles L. Brown Department of Electrical and Computer Engineering, University of Virginia, 351 McCormick Road, Charlottesville, VA, USA
Xiao-Hong Tang
Affiliation:
School of Electronic Engineering, University of Electronic Science and Technology of China (UESTC), Qingshuihe Campus: No. 2006, Xiyuan Avenue, West Hi-Tech Zone, Chengdu, Sichuan, China
*
Corresponding author: D. Lu Email: ludi888abc@hotmail.com or dl3ap@virgina.edu
Get access Rights & Permissions [Opens in a new window]

Abstract

In this paper, a compact dual-band bandpass filter (DB-BPF) using new dual-mode resonator-loaded resonators (DM-RLRs) is presented and investigated to simultaneously achieve controllable return loss (RL), bandwidth (BW) and transmission zeros (TZs), and the simple strategy for this type of filter design is proposed. The DB-BPF consists of two high-flexibility DM-RLRs with separated electric and magnetic coupling (SEMC). Specifically, the proposed DM-RLR provides the DB-BPF with center frequency control as well as RL control, and SEMC is utilized for the BW and TZ control. To facilitate the design, a simple optimization-based design strategy is proposed and employed, resulting in an example layout. Finally, the example filter, with center frequencies of 1.57 GHz (channel 1 for GPS) and 3.5 GHz (channel 2 for WiMAX), is fabricated and measured. The measurement insertion loss and RL are 0.9/0.9 and 17/20 dB. The fabricated DB-BPF also exhibits a compact size of 0.12λg × 0.08λg at 1.57 GHz.

Keywords

Dual-band bandpass filter (DB-BPF)Dual-mode resonators-loaded resonator (DM-RLR)Separated electric and magnetic coupling (SEMC)Transmission zeros (TZs) controlBandwidth (BW)Return loss (RL) control
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 9 , Special Issue 7: EuCAP 2016 special issue , September 2017 , pp. 1459 - 1465
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2017 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

[1] Chan, H.-K.; Chang, K.: Independently controllable dual-band bandpass filters using asymmetric stepped-impedance resonators. IEEE Trans. Microw. Theory Technol., 59 (2011), 3037–3047.Google Scholar
[2] Li, D.; Zhang, Y.; Feng, X.; Song, K., Fan, Y.: Dual-band bandpass filter with controllable center frequency and bandwidth using short stub-loaded SIR and tri-section SIR. AEU-Int. J. Electron. Commun., 69 (2015), 1004–1008.Google Scholar
[3] Gao, L.; Zhang, X.-Y.: High-selectivity dual-band bandpass filter using a quad-mode resonator with source-load coupling. IEEE Microw. Wireless Compon. Lett., 23 (2013), 474–476.Google Scholar
[4] Peng, Y.; Zhang, L.; Fu, J.; Wang, Y.; Leng, Y.: Compact dual-band bandpass filter using coupled lines multimode resonator. IEEE Microw. Wireless Compon. Lett., 25 (2015), 235–237.CrossRefGoogle Scholar
[5] Zhang, S.; Zhu, L.: Compact split-type dual-band bandpass filter based on resonators. IEEE Microw. Wireless Compon. Lett., 23 (2013), 344–346.Google Scholar
[6] Ma, K.X.; Ma, J.G.; Yeo, K.: A compact size coupling controllable filter with separate electric and magnetic coupling paths. IEEE Trans. Microw. Theory Technol., 54 (2006), 1113–1118.Google Scholar
[7] Chu, Q.-X.; Wang, H.: A compact open-loop filter with mixed electric and magnetic coupling. IEEE Trans. Microw. Theory Technol., 56 (2008), 431–439.Google Scholar
[8] Zhang, S.-B.; Zhu, L.; Weerasekera, R.: Synthesis of inline mixed coupled quasi-elliptic bandpass filters based on resonators. IEEE Trans. Microw. Theory Technol., 63 (2015), 3487–3493.Google Scholar
[9] Zong, B.-F.; Wang, G.-M.; Liang, J.-G.; Zhou, C.: Compact bandpass filter with two tunable transmission zeros using hybrid resonators. IEEE Microw. Wireless Compon. Lett., 25 (2015), 88–90.CrossRefGoogle Scholar
[10] Xiao, J.-K.; Zhu, M.; Ma, J.-G.; Hong, J.-S.: Conductor-backed CPW bandpass filters with electromagnetic couplings. IEEE Microw. Wireless Compon. Lett., 26 (2016), 401–403.Google Scholar
[11] Chen, C.-F.; Chang, S.-F.; Tseng, B.-H.; Weng, J.-H.: Compact dual-band stepped-impedance resonator filter with separate coupling paths. Electron. Lett., 50 (2014), 1551–1553.Google Scholar
[12] Hong, J.S.; Lancaster, M.J.: Microstrip Filters for RF/Microwave Applications. Wiley, New York; 2011.Google Scholar