A novel triple notch-bands ultra wide-band band-pass filters using parallel multi-mode resonators and CSRRs

Abstract

This article discusses a technique based on combination of multimode resonators (MMR) and complementary split ring resonators (CSRR) to design multi notch-bands ultra wide-band (UWB) band-pass filters (BPF). The proposed structure consists of two parallel multimode resonators, resulting in a dual notch-band UWB BPF, integrated with a single cell of CSRR to realize the third notch-band. The mechanism of realizing the notchbands is mathematically presented and a triple notch-bands UWB BPF is designed, simulated and fabricated. The overall size of the proposed filter is reported to be around 36 3 7.7 mm 2 where a size reduction of around 35% is demonstrated in comparison to the conventional filter.

Compact UWB bandpass filter with dual-notch bands using asymmetric tri-section stepped impedance resonator

“…‐ Notch band is created using complimentary split ring resonator as reported in Ref. . Stub loaded resonator based MMR structures are also evolved in order to satisfy the area requirement .…”

Compact UWB bandpass filter with a reconfigurable notched band

“…However, the ultra‐wide bandwidth of the UWB systems will cause interference with other narrow band systems such as the wireless local‐area network (WLAN) bands (5.15‐5.35 GHz and 5.725‐5.825 GHz) and 6.8‐GHz RF identification (RFID) communication band. Therefore, UWB BPFs with single‐ and multiple‐notched bands or a reconfigurable notched band are needed to suppress the interferences . A UWB BPF with a notched band realized by using an embedded open‐circuited stub was reported by Weng et al A method to implement notched band by utilizing open‐circuited microstrip lines embedded in defected ground structure was presented by Lin et al In the work by Luo et al, a hybrid microstrip and coplanar waveguide (CPW) detached mode resonator structure was proposed with a meander line slot to realize UWB BPF with narrow notched band.…”

“…UWB BPFs with dual notch bands were proposed to avoid interference with WLAN frequencies as well as 8.0 GHz satellite communication system signal . Compact UWB BPFs with triple notched bands were designed by using CSRRs . However, the design of reconfigurable band‐notched UWB BPF in pursuits of better performance, smaller size, and lower cost remains a great challenge.…”

A compact UWB bandpass filter with a notched band using a multistubs loaded resonator

“…Obviously, UWB frequency band might be interfered with some narrowband RF signals existing in the same environment, such as wireless local‐area network (WLAN), Worldwide Interoperability for Microwave Access (WiMAX), and so on. Then, UWB bandpass filters with notched bands to suppress these possible interferences are popular recently . In order to create notched bands, some structures are embedded in UWB bandpass filters, for example, a stepped impedance resonator in Ref.…”

“…Then, UWB bandpass filters with notched bands to suppress these possible interferences are popular recently. [7][8][9][10][11][12][13][14][15][16] In order to create notched bands, some structures are embedded in UWB bandpass filters, for example, a stepped impedance resonator in Ref. 7, a k/4 meander slot-line structure in Ref.…”