This study presents a new slitted electromagnetic bandgap (EBG) structure to filter undesired wireless local area network (WLAN) and worldwide interoperability for microwave access (WiMAX) bands in the ultra‐wideband (UWB) spectrum. A simple UWB antenna which consists of a microstrip tapered feed line, a circular patch and a defected ground structure is used as a reference antenna. The antenna is then integrated with a slitted EBG structure near the feed line to notch two interfering bands. The created notched bands by the EBG structure can be independently controlled. Owing to structural symmetry of the proposed antenna, the size can be reduced by approximately half to form a miniaturised antenna. The miniaturised antenna has the same full‐size antenna characteristics with little change in the notched bands specifications. Frequency domain measurement results show that the full‐size and miniaturised antennas have a flat transfer function, and a group delay variation of about 0.5 ns in the entire UWB band except for the notched bands.

In this study, a compact ultra‐wide band (UWB) bandpass filter (BPF) with improved out‐of‐band performance and dual notch bands operation is suggested and its design and analysis procedure is discussed. In the suggested BPF, etching slot in the ground plane is employ to meliorate the out‐of band efficiency of the filter. In addition, four short‐circuited folded stubs are used to enhance the selectivity of the BPF at its cutoff frequencies. The upper stop‐band with more than 20dB attenuation level extends to 20 GHz. Dual notch bands function is added to the performance of the filter by coupling two stepped‐impedance resonator (SIR) to the filter primary resonator. It is shown that the frequency locations of the notch bands can be adjusted by varying the impedance ratio of the embedded SIR. The constructed prototype has a small size and is able to coverage frequency band of 2.97–11.18 GHz with dual notch bands function at 5.5–6.3 and 7.84–9.06 GHz, which suppresses the interference between UWB spectrum with WLAN and satellite communication frequency bands, respectively. © 2017 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:672–674, 2017

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