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A Novel Approach of Reconfigurable Band-pass Filter with Actively Loaded Bandwidth for Ultrawide Wi-Fi Communication

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Abstract

A compact, ultra-broadband multi-coupled transmission line band-pass filter (BPF) is demonstrated. The proposed multi-coupled transmission line is essentially designed by exploiting parallel-coupled line (PCL) structures. Technically, the proposed filter comprises multi-coupled transmission line and open-stub structures that are connected in a cascade topology. The higher (fH) and lower (fL) edge frequencies of the band are mainly related to the electrical length of the multi-coupled transmission line and the series open stub, respectively. The difference in even- and odd-mode phase velocities is reduced by using multi-coupled line structure acting as coupled CPW mode resonator. In addition, the stop-band rejection is enhanced through an incorporation of multi-coupled transmission line when compared to conventional PCL filter. Moreover, the stub loaded with active capacitor compensates for the loss of passive filter and helps to achieve reconfigurability in bandwidth along with varactor-loaded stub. The proposed filter design is verified through experimental demonstration. Compared with the classical PCL-BPFs, the proposed filter is of a relatively simple and compact configuration. The demonstrated multi-coupled transmission line BPF has about 12.2% 3-dB fractional bandwidth, sharp selectivity and great stop-band rejection. Simulated and measured result exhibits a stop-band rejection lower than − 16 dB till 20 GHz with passband gain of + 0.6 dB, bandwidth reconfigurability of 51 MHz and return loss of 20 dB. The BPF has much reduced circuit area of 43.4 × 31.8 mm2. It is implemented on the FR4 substrate with dielectric constant εr = 4.2, substrate height = 0.825 mm and thickness of the conductor = 0.017 mm.

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Data availability statement

Data are available from the authors upon reasonable request.

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Authors and Affiliations

  1. Department of Electronics and Communication, Birla Institute of Technology, Mesra, Ranchi, Jharkhand, 835215, India

    Shikha Swaroop Sharma & Anjani Kumar Tiwary

  2. Department of Computer Science and Engineering, Galgotias College of Engineering and Technology, Greater Noida, India

    Shikha Swaroop Sharma & Rajesh Kumar

Authors
  1. Shikha Swaroop Sharma
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  2. Anjani Kumar Tiwary
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Correspondence to Rajesh Kumar.

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Sharma, S.S., Tiwary, A.K. & Kumar, R. A Novel Approach of Reconfigurable Band-pass Filter with Actively Loaded Bandwidth for Ultrawide Wi-Fi Communication. Circuits Syst Signal Process 43, 22–33 (2024). https://doi.org/10.1007/s00034-023-02468-2

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