A miniaturized high selectivity band‐pass filter using a dual‐mode patch resonator with two pairs of slots

Abstract

This article proposes a design of miniaturized high selectivity band‐pass filter by using a dual‐mode patch resonator with two pairs of uniform slots set in the four corners. The effect of the pairs of the slots on the resonant modes of the square patch resonator is investigated first. For filter design, the slots set in the four corners of the patch resonator are provided as the perturbation elements to tune the resonant modes and thus form the filter response. The pairs of the slots reduce the fundamental resonant frequency and thus miniaturize the filter size. The designed filter is simulated and measured at 1.95 GHz for the fifth generation applications with narrow bandwidth. High band selectivity is obtained due to the creation of transmission zeros near the passband edges. The filter performances are measured by network analyzer and the results are discussed.

Wideband and Highly-Integrated Dual-Mode LTCC Filter Using Vertically Stacked Double-Ring Resonator

“…The overall performances of the proposed BPF exceed the performances of existing BPFs in terms of fractional bandwidth (FBW), in-band insertion loss, suppression at 2f 0 , I/O feeding style, size, integration level, and fabrication process [3][4][5][6][7][8][9][10][11][12]. Non-orthogonal I/O feeding style is very important for BPFs in transceiver's front-end systems, as the BPFs are required to be interconnected conveniently with neighboring devices.…”

“…Although modern dual-mode BPFs achieve a size reduction of 50% compared with single-mode ones, a large number of them suffer a limited bandwidth [3][4][5][6]. Furthermore, conventional dual-mode BPFs use orthogonal I/O feeding ports to excite two degenerate modes [7][8][9], which result in interconnecting difficulties with neighboring devices. Moreover, disturbing elements to excite two degenerate modes in conventional dual-mode BPFs take up a certain circuit space and increase the optimization work [10,11].…”

Compact dual-mode microstrip bandpass filter based on slotted square patch resonator

“…Sharp rejection and high-selectivity BPFs were reported using the dual-mode characteristics of coupled-line resonator structures (Velidi and Sanyal, 2010; Wu et al , 2015; Chen, 2016; Das and Chatterjee, 2019; Afzali et al , 2021; Alnahwi et al , 2021; Mohamadinia et al , 2021). In this context, resonators using ring (Chiou et al , 2010; Feng et al , 2015), loop (Gorur, 2004; Mo et al , 2009; Wu et al , 2012; Song et al , 2017) and slotted patch (Liu et al , 2019; Neeboriya, 2019; Zhao et al , 2020) structures were also realized for the design of planar filters with perturbed configurations to obtain a dual-mode response. However, without using any perturbation element, the design of dual-mode BPF loaded with open stubs has been presented using a ring resonator by Feng et al (2015).…”

Design of Dual-Band Dual-Mode Band-Pass Filter Utilizing 0° Feed Structure and Lumped Capacitors for WLAN/WiMAX Applications

“…Due to the distinct properties of multiband BPFs, such as wide rejection band, deep transmission zeros, high selectivity, sharp roll-off rate, and tunable behavior, they have a specific place in the RF receivers. Various techniques were carried out in designing BPF such as stepped impedance resonator (SIR) [13][14][15], balanced BPFs [16][17][18], multilayer structures [19,20], substrate integrated waveguide (SIW) [21][22][23], dual-mode patch resonator [24], and meandered loop resonator [25].…”

“…The BPF presented in [23] was based on the SIW cavity to obtain dual/tri band-pass behavior and it succeeded in providing an acceptable performance; however, it was not size-efficient. Using a dual-mode patch resonator, a high selectivity BPF was implemented for 5G operation as demonstrated in [24]. In order to obtain a dual-band behavior in the L-band, a meandered loop resonator was suggested in [25], and the degenerate modes were excited by changing the perturbation size.…”