Compact design of reconfigurable bandpass filter for heterogeneous wireless systems

Issa T.E. Elfergani*, M. Sajedin, J. Rodriguez, R. A. Abd Alhameed, A. Iqbal, A. Abdulkhaleq, C. Zebiri

*Corresponding author for this work

Research output: Contribution to conferencePaperpeer-review


A compact uni-planar printed tunable bandpass filter (BPF) is studied and analysed. The present filter consists of coupled line resonators printed over an RT/ duroid 6006/6010LM substrate, with a permittivity of 10.2 and thickness of 1.27mm. To reconfigure the desired pass band frequency, a varactor diode is introduced at the proper position on the middle strip resonator. By varying the bias voltage of the varactor from 0.16V up to 14.62V, the proposed filter is able to tune its pass band frequency from GSM1800MHz to LTE2600MHz. The fabricated tunable BPF exhibits a wide tuning range with a 36.36% bandwidth, in-band insertion loss of around 2.78 dB and return loss better than 15 dB. The present BPF filter has come up with a simple structure and a compact volume of 16 × 37.5 ×1.27 mm3. This makes the present filter as a promising candidate for several applications in future multi-standard wireless communications.

Original languageEnglish
Publication statusPublished - 2019
EventAntennas and Propagation Conference 2019, APC 2019 - Birmingham, United Kingdom
Duration: 11 Nov 201912 Nov 2019


ConferenceAntennas and Propagation Conference 2019, APC 2019
Country/TerritoryUnited Kingdom


  • Coupled Transmission Lines
  • Tunable BPF
  • Varactor Device
  • Wide Tuning Range


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