Compact dual-wideband bandpass filter for wireless applications

Shriram, Solunke Yogesh; Kumar, Kanaparthi V. Phani; Karthikeyan, S. S.

doi:10.1016/j.aeue.2018.08.007

Cited by 15 publications

(7 citation statements)

References 17 publications

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“…Taking advantage of the nodal approach, three methods to design dual-band filters with acoustic wave resonators are systematically discussed, and it was found that the conventional ladder topology can accurately control the final response and is compatible with the acoustic wave technology requirements [ 10 ]. K. V. Phani Kumar et al presented a compact dual-band filter based on a signal interference technique, formed by the transmission lines [ 11 ]. They also achieved a dual-band filter based on a paper substrate, which was designed with a transversal filtering section, coupled lines, and stepped impedance stubs, showing high filtering selectivity and high isolation levels [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

Dual-Passband SAW Filter Based on a 32°YX-LN/SiO2/SiC Multilayered Substrate

et al. 2023

Micromachines

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To meet the demands of highly integrated and miniaturized radio frequency front-end (RFFE) modules, multi-passband filters which support multi-channel compounding come to the foreground. In this work, we proposed a new design of a dual-passband surface acoustic wave (SAW) filter based on a 32°YX-LiNbO3 (LN)/SiO2/SiC multilayered structure. The filter is of a standalone ladder topology and comprises dual-mode resonators, in which the shear horizontal (SH) mode and high-order SH mode are simultaneously excited through electrode thickness modulation. The impact of electrode thickness on the performance of the dual-mode resonator was systematically investigated by the finite element method (FEM), and resonators were prepared and verified the simulation results. The electromechanical coupling coefficients (K2) of the SH modes are 15.1% and 17.0%, while the maximum Bode-Q (Qmax) values are 150 and 247, respectively, for the fabricated resonators with wavelengths of 1 μm and 1.1 μm. In terms of the high-order SH modes in these resonators, the K2 values are 9.8% and 8.4%, and Qmax values are 190 and 262, respectively. The fabricated dual-band filter shows the center frequencies (fc) of 3065 MHz and 4808 MHz as two bands, with 3-dB fractional bandwidths (FBW) of 5.1% and 5.9%, respectively. Such a dual-band SAW filter based on a conventional ladder topology is meaningful in terms of its compact layout and diminished area occupancy. This work provides a promising avenue to constitute a high-performance dual-passband SAW filter for sub-6 GHz RF application.

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Section: Introductionmentioning

confidence: 99%

Dual-Passband SAW Filter Based on a 32°YX-LN/SiO2/SiC Multilayered Substrate

et al. 2023

Micromachines

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“…Bandpass filters are mainly transmission line-based passive devices that are used in many RF/microwave circuits and wireless communication and radar systems. They are essential front-end components that can pass signals within a certain frequency range and reject unwanted out-of-band signals [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 ]. There are many parameters to be considered in the design and implementation of a bandpass filter, such as the design structure, size, passband frequency bandwidth, insertion loss, selectivity, roll-off rate, isolation, and stopband rejection.…”

Section: Introductionmentioning

confidence: 99%

“…Many technical solutions have been proposed to increase the filter’s frequency bandwidth, including the adoption of multiple frequency bands (dual, triple, quadruple, etc.) [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 ]. This type of filter is excellent for multiple frequency systems such as carrier aggregation or wireless local area network (WLAN) bands.…”

Section: Introductionmentioning

confidence: 99%

Dual-Band and Wideband Bandpass Filters Using Coupled Lines and Tri-Stepped Impedance Stubs

Alazemi

2023

Micromachines

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In this paper, two bandpass filters—one with a dual-band response and the other with a wideband response—were designed, implemented, and experimented with. The filters are based on the novel combination of series coupled lines and tri-stepped impedance stubs. However, coupled lines along with tri-stepped impedance open stubs (TSIOSs) give a third-order dual passband response. The advantage of dual-band filters using coupled lines and TSIOSs is that they have wide passbands that are close together and separated by a single transmission zero. In contrast, the inclusion of tri-stepped impedance short-circuited stubs (TSISSs) instead of TSIOSs provides a fifth-order wide passband response. The advantage of wideband bandpass filters using coupled lines and TSISSs is that they have a very good selectivity factor. Theoretical analysis was carried out to validate both filter configurations. The tested bandpass filter using coupled lines and TSIOS units had two close wide passbands operating at 0.92 and 1.52 GHz center frequencies, respectively. The dual-band bandpass filter was implemented to operate in GSM and GPS applications. The first passband had a 3 dB fractional bandwidth (FBW) of 38.04%, while the second passband had a 3 dB FBW of 22.36%. The experimental result of the wideband bandpass filter (with coupled lines and TSISS units) had a center frequency of 1.51 GHz with a 3 dB fractional bandwidth of 62.91% and a selectivity factor of 0.90. A good congruence was demonstrated between the full-wave simulated and tested results for both filters.

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“…Modern wireless communication systems need high performance filters which have controllable CFs, passband bandwidths, stopband bandwidths, and sharp rejection. Different designing structures and methods have been greatly studied [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. Generally, the dual-band bandpass filter (BPF) adjusts the CFs by changing transmission poles (TPs) [1,2].…”

Section: Introductionmentioning

confidence: 99%

“…By introducing more TZs in the stopband, the performances of selectivity and stopband bandwidth can be enhanced. Signal-interference principles [4][5][6] are applied to design single-or dual-band BPFs with broad stopband bandwidths by creating multiple TZs. To design high performance filters with multiple passbands, the method of multiple monofrequency resonators coupling to a non-resonating node is proposed in [7].…”

Section: Introductionmentioning

confidence: 99%

Dual-Band Bandpass Filter With Controllable Stopband Bandwidth

Wang¹,

Wei²,

Gao

et al. 2022

Front. Phys.

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A novel dual-band bandpass filter (BPF) is proposed with independently controllable transmission zeros (TZs) which can realize widely tunable stopband bandwidth (BW). The planar microstrip filter consists of a three-degree L-C ladder lowpass filter loaded with two unsymmetrical shorted stubs which are used to produce different TZs. By tuning the parameters of the two unsymmetrical shorted stubs, the TZs can be independently controlled. Therefore, the BPF has independent controllable center frequencies (CFs), passband bandwidths, and stopband bandwidths between adjacent passbands. All the L-C values in the equivalent circuit of the proposed filter are optimized to fulfill the design specifications. For demonstration, a dual-band BPF is designed. The measured results show good agreement with the simulated ones.

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Compact dual-wideband bandpass filter for wireless applications

Cited by 15 publications

References 17 publications

Dual-Passband SAW Filter Based on a 32°YX-LN/SiO2/SiC Multilayered Substrate

Dual-Passband SAW Filter Based on a 32°YX-LN/SiO2/SiC Multilayered Substrate

Dual-Band and Wideband Bandpass Filters Using Coupled Lines and Tri-Stepped Impedance Stubs

Dual-Band Bandpass Filter With Controllable Stopband Bandwidth

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