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Theoretical Based Design of Ultra-Wideband Filter with Dual Band-Notch

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Abstract

In this paper, a compact ultra-wideband microstrip band-pass filter with single/dual-notched bands is proposed. The filter is theoretically designed based on a multiple-mode resonator which consists of a short circuit stub loaded-ring resonator. A multi stepped impedance resonator is also applied to reject unwanted in-band frequencies and extend the upper-stopband. The proposed filter is analyzed by utilizing graphs according to odd- and even-mode method. The resonant modes are allocated between 3.1 GHz to 10.6 GHz and transmission zeros are adjusted at upper stopband to create a sharp roll-off and suppress the spurious harmonics, as well as a compact physical size. Full-wave simulations are performed for three types of filters, with and without notch-bands, to verify theoretical results. The measurement results demonstrate that not only − 3 dB fractional bandwidth is more than 120% and but also at least − 20 dB suppression can be achieved at upper-stopband.

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Authors and Affiliations

  1. Department of Communications Engineering, University of Sistan and Baluchestan, Zahedan, Iran

    Mona Yazdani & Javad Ahmadi-Shokouh

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  1. Mona Yazdani
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  2. Javad Ahmadi-Shokouh
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Correspondence to Javad Ahmadi-Shokouh.

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Yazdani, M., Ahmadi-Shokouh, J. Theoretical Based Design of Ultra-Wideband Filter with Dual Band-Notch. Wireless Pers Commun 100, 1219–1233 (2018). https://doi.org/10.1007/s11277-018-5629-1

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  • DOI: https://doi.org/10.1007/s11277-018-5629-1

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