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Open-Loop Resonator with Interdigital Capacitor Bandpass Filter For Wireless Application

Kangana Saini, Kundan Singh Rathore


In this paper bandpass filter have been designed and simulate using two open loop resonator with polygonal forms and to enlarge the bandwidth by using interdigital capacitor in between two open loop resonators. The overall filter dimensions are 8 x 16 mm² using Rogers Ro 3010 with thickness of 1.5 mm and relative permittivity 10.2 The centre frequency of 2.45 GHz and -3dB fractional bandwidth (FBW) of 12.3% with return loss -21.5dB and insertion loss -0.8dB. There are two transmission zeroes are at 2.202GHz and 2.753GHz. The proposed band pass filter is simulated with the help of computer simulation technology (CST). The proposed filter used for Wi-Fi, WLAN and Bluetooth application.


Bandpass filter (BPF); Open loop resonator (OLR); interdigital capacitor; Wi-Fi; WLAN

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A J Salim1, A N Alkhafaji1, M S Taha1 and J K Ali1 “A polygonal open-loop resonator compact bandpass filter for Bluetooth and WLAN applications”, doi:10.1088/1757-899X/433/1/012083

Li Zhu, Vijay Devabhaktuni, Chunyan Wang, and Ming Yu, “Adjustable Bandwidth Filter Design Based on Interdigital Capacitors”, VOL. 18, NO. 1, JANUARY 2008

Hasan A and Nadeem A 2008 Novel microstrip hairpin line narrowband bandpass filter using via ground holes Progress in Electromagnetics 78 pp 393-419.

Worapishet A and Surakampontom A 2012 Stepped impedance coupled resonators for implementation of parallel coupled microstrip filters with spurious band suppression IEEE Trans. On Microwave Theory and Technology 60 pp 1540-1548.

Arunvipas P 2011 Design of compact micro strip stepped-impedance resonator band pass filters Procedia Engineering 8 pp 30–35.

Shivhare J and Reddy B 2015 Design and development of a single fold hairpin line microstrip bandpass filter at 3250 MHz for S-Band communication systems International journal of advances in engineering & technology 8 pp 337-346.

Im H and Yun S 2017 Design of a Dual-Band Bandpass Filter Using an Open-Loop Resonator Journal of Electromagnetic Engineering and Science 17 pp 197-201.

Rohit T, Ramesh R, Abhishek S, Habiba H and Sandhya R 2016 Microstrip open loop resonator using dual feed techniques for Wireless Applications IOSR journal of electronics and communication engineering 11 pp 13-15.

Khani S, Makki S, Mohammad S, Mousavi H, Danaie M and Rezaei P 2017Adjustable compact dual-band microstrip bandpass filter using T-shaped resonators Micro. Opt Technol. Lett.59 pp 2970–2975.

Alqaisy M, Chakrabraty C, Ali J and Alhawari A 2015 A miniature fractal-based dual-mode dual-band microstrip bandpass filter design International Journal of Microwave and Wireless Technologies 7 pp 127-133.

Ahmed H, Salim A, Ali J and Alqaisy M 2016 A fractal-based dual-mode microstrip band stop filter for wireless applications IEEE 16th Mediterranean Microwave Symposium 1-4 (Abu Dhabi).

Mezaal Y, Ali J and Eyyuboglu H 2015 Miniaturized microstrip bandpass filters based on Moore fractal geometry International Journal of Electronics 102 pp 1306-1319.

Vágner P and Kasal M 2010 A novel bandpass filter using a combination of open-loop defected ground structure and half-wavelength micro strip resonators Radio engineering 19.

Alkhafaji A, Salim A and Ali J 2015 Compact substrate integrated waveguide BPF for wideband communication applications Proceedings of Progress in Electromagnetics Research Symposium (Prague).

Saghlatoon H and Neshati M2012 Design investigating of a novel band pass filter using trisection open loop resonator Progress in electromagnetics research symposium proceedings (Malaysia) 27-30.

Cite this Article

Kangana Saini, Kundan Singh Rathore. Open-Loop Resonator with Interdigital Capacitor Bandpass Filter For Wireless Application. Recent Trends in Electronics & Communication Systems. 2019; 6(2): 22–25p.



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