Hostname: page-component-76fb5796d-zzh7m Total loading time: 0 Render date: 2024-04-25T21:39:02.647Z Has data issue: false hasContentIssue false
  • English
  • Français

Compact dual-band bandpass filter using asymmetric stepped impedance stub loaded multimode resonator

Published online by Cambridge University Press:  02 July 2015

Manimala Pal ,
Rowdra Ghatak  and
Pankaj Sarkar
Manimala Pal*
Affiliation:
Radio Engineering and Antenna Laboratory, Department of Electronics and Communication Engineering, NFET, NSHM Knowledge Campus Durgapur, Durgapur-713212, India
Rowdra Ghatak
Affiliation:
Microwave and Antenna Research Laboratory, Electronics and Communication Engineering Department, National Institute of Technology Durgapur, Durgapur-713209, West Bengal, India
Pankaj Sarkar
Affiliation:
Electronics and Communication Engineering Department, School of Technology, North Eastern Hill University, Shillong-793022, Meghalaya, India
*
Corresponding author: M. Pal Email: manimalapal@yahoo.com
Get access Rights & Permissions [Opens in a new window]

Abstract

This paper presents, a dual-band bandpass filter using asymmetric stepped impedance stub loaded open loop resonator (OLR) for WLAN and WiMAX application. The outer OLR is realized to operate at lower passband of 2.45 GHz which is directly coupled to input and output ports whereas the asymmetric stepped impedance stub that loads the outer resonator contributes to 3.5 GHz passband. The introduction of asymmetric stepped impedance stub provides further control of improving the upper passband edge selectivity of second passband and in shifting the spurious modes away from second band thereby contributing to the wide upper stopband. The insertion loss is within 1.5 dB for each passband with 10 dB passband bandwidth of 250 MHz at both bands. A stopband up to 10 GHz is also obtained. A prototype is developed and the s-parameters obtained from electromagnetic simulation, equivalent transmission line model and measurement are in close agreement. The overall dimension of the filter is 25.45 × 15.89 mm2 which renders it a compact size.

Keywords

Bandpass filterDual-band filterStub loaded resonatorAsymmetric stepped impedance resonator
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 9 , Issue 1 , February 2017 , pp. 45 - 50
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2015 

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] Hong, J.S.; Lancaster, M.J.: Microstrip Filter for RF/Microwave Applications, Wiley, New York, 2001.CrossRefGoogle Scholar
[2] Chang, S.F.; Jang, Y.H.; Chen, J.L.: Dual band step impedance bandpass filter for multiband wireless LANs. Electron. Lett., 40 (1) (2004), 38–39.Google Scholar
[3] Makimoto, M.; Yamashita, S.: Microwave Resonators and Filter for Wireless Communication, Springer, Berlin, Heidelberg, 2001.Google Scholar
[4] Chu, Q.-X.; Chen, F.C.: A compact dual-band bandpass filter using meandering stepped impedance resonators. IEEE Microw. Wireless Compon. Lett., 18 (5) (2008), 320–322.Google Scholar
[5] Jiang, M.; Chang, L.-M.; Chin, A.: Design of dual-passbands microstrip bandpass filters with multi-spurious suppression. IEEE Microw. Wireless Compon. Lett., 20 (4) (2010), 199–201.Google Scholar
[6] Kim, C.H.; Chang, K.: Independently controllable dual-band bandpass filters using asymmetric stepped-impedance resonators. IEEE Trans. Microw. Theory Tech., 59 (12) (2011), 3037–3047.Google Scholar
[7] Sun, S.-J.; Su, T.; Kun, D.; Wu, B.; Chang- Hong, L.: Shorted-ended stepped-impedance dual resonance resonator and its application to bandpass filter. IEEE Trans. Microw. Theory Tech., 61 (9) (2013), 3209–3215.Google Scholar
[8] Zhan, S.; Zhu, L.: Fully Canonical dual band bandpass filter with λ/4 stepped impedance resonators. Electron. Lett., 50 (3) (2014), 192–194.CrossRefGoogle Scholar
[9] Sarkar, P., Ghatak, R., Pal, M.; Poddar, D.R.: A planar compact dual-band bandpass filter using stepped impedance resonator and interdigital capacitor. International J. Microw. Wireless Technol., 3 (6) (2011), 261–267.CrossRefGoogle Scholar
[10] Wu, Y.; Zhou, S.; Zhang, W.; Liao, M.; Liu, Y.: Coupled-Line dual band bandpass filter with compact structure and wide stopband. Electron. Lett., 50 (3) (2014), 187–189.Google Scholar