A Dual-Band Bandpass Filter Using Quad-Mode Resonator for Bluetooth and WLAN Applications

A multi-stub loaded loop resonator (MSLLR) is proposed in this paper, which exhibits five main resonant modes of interest. Then, an ultra-wideband (UWB) bandpass filter is developed on it. Through direct source/load coupling, two transmission zeros can be created at both sides of the passband of the filter, which improves its frequency selectivity. The measured results of the fabricated filter show that its bandwidth can cover the UWB frequency range and the return loss in the passband is greater than 12.9[Formula: see text]dB. Frequency selectivity is improved due to two transmission zeros at both sides of the passband. Group delay variation is less than 0.48[Formula: see text]ns in the passband, which is relatively flat.

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Ultra-Wideband Bandpass Filter Based on a Multi-Stub Loaded Loop Resonator

Xie

Yang

Deng

2019

J CIRCUIT SYST COMP

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A Simple WiMAX and RFID Band-Notched UWB Bandpass Filter and Its Susceptibility Study

Murmu

Koley

Bage

et al. 2019

J CIRCUIT SYST COMP

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An ultra-wideband (UWB) bandpass filter (BPF) with a fractional bandwidth (FBW) of about 110%, transmission zero at the high-frequency edge, and band notches at the worldwide interoperability for microwave access (WiMAX) and radio frequency identification (RFID) band is presented in this paper. The filter is based on single short-circuited stub, U-shaped defected ground structure (DGS) array, two U-shaped resonators and two stepped impedance resonators (SIRs). The filter is compact and exhibits a selective filtering characteristic equivalent to a three-pole Chebyshev filter. The design procedure has been described and verified by full-wave electromagnetic (EM) simulation and measurement. The proposed filter has low insertion loss, sharp rejection, and excellent in and out band performance. Due to its applications in WiMAX and RFID systems, the filter may be subjected to high EM radiation from the antenna and nearby sources. Therefore, susceptibility study of such a filter is very important. Hence, the susceptibility study of the band-notched UWB BPF has been carried out by subjecting the structure to an interference source.

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A Dual-Band Bandpass Filter Using Quad-Mode Resonator for Bluetooth and WLAN Applications

Cited by 2 publications

References 17 publications

Ultra-Wideband Bandpass Filter Based on a Multi-Stub Loaded Loop Resonator

Ultra-Wideband Bandpass Filter Based on a Multi-Stub Loaded Loop Resonator

A Simple WiMAX and RFID Band-Notched UWB Bandpass Filter and Its Susceptibility Study

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