This paper aims to present a highly selective, compact size new ultra-wideband (UWB) bandpass filter with three sharp notches for UWB indoor applications. The fundamental geometry of the filter is based on a modified multi-mode resonator (MMR) structure which comprises an open-ended step impedance resonator (SIR) attached to an interdigitated uniform impedance resonator (UIR). Realizing a Comb-shaped resonator structure below the UIR and symmetrically extending the lower arm edge of the interdigital coupled lines, three notches are generated at 6 GHz, 6.53 GHz, and 8.35 GHz. These notches have improved the UWB bandpass filter responses by suppressing the existing interferences in the UWB passband created by Wi-Fi 6E (6 GHz), super-extended C band (6.425 GHz ∼ 6.725 GHz), X band satellite communications for satellite TV networks or raw satellite feeds (7.25 GHz ∼ 8.395 GHz). Concurrently the notched band filter has achieved superiority in other salient features concerning passband and stopband of the filter such as a high passband fractional bandwidth (115.76%), low return loss (−13.27 dB), low insertion loss (0.44 dB ∼ 0.97 dB), wide upper stopband (5.37 GHz), nearly flat group delay (0.28 ns ∼ 0.45 ns), etc. The ultimate design of the UWB bandpass filter is fabricated and verified by comparing the simulated filter responses with the measured results indicating a good agreement.

No abstract

No abstract

No abstract

No abstract