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Miniaturized quad-channel microstrip diplexer with low insertion loss and wide stopband for multi-service wireless communication systems

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Abstract

In this paper, a compact four-channel diplexer is designed using a microstrip structure to separate input signals at 2.07/3.94 GHz and 2.37/4.49 GHz and load them on two output ports. The presented diplexer is designed utilizing a novel structure, which can be applied in modern multi-band wireless communication systems and IEEE 802.16 WiMAX that covers 3.17–4.2 GHz. This diplexer is consisting of coupled lines, a spiral cell and U-shape structures that are integrated to obtain a high performance. To create four passbands at two output ports, the proposed structure is miniaturized so that it occupies only a 0.025 λ 2g circuit size where λg is the guided wavelength calculated at 2.07 GHz. Moreover, the low insertion losses are obtained at all channels. Another achievement of this work is obtaining a wide stopband. After the last passband, harmonics are attenuated up to 8 GHz, which is suitable for ultra wideband applications. The introduced diplexer is fabricated to confirm the design process where the measured results are in a good agreement with the simulations.

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Authors and Affiliations

  1. Department of Electrical Engineering, Kermanshah University of Technology, Kermanshah, Iran

    A. Rezaei & H. Mohammadi

  2. Young Researchers and Elite Club, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran

    L. Noori

Authors
  1. A. Rezaei
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  2. L. Noori
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  3. H. Mohammadi
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Correspondence to L. Noori.

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Rezaei, A., Noori, L. & Mohammadi, H. Miniaturized quad-channel microstrip diplexer with low insertion loss and wide stopband for multi-service wireless communication systems. Wireless Netw 25, 2989–2996 (2019). https://doi.org/10.1007/s11276-018-1693-4

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  • DOI: https://doi.org/10.1007/s11276-018-1693-4

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