Novel fractal-based dual-mode quasi-elliptic microstrip band-pass filter for WLAN applications

Karthie, S.; Manibala, S. Lakshmi

doi:10.1007/s00339-023-06495-3

Cited by 1 publication

(1 citation statement)

References 30 publications

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“…Compared with single-ended devices, balanced circuits have better robustness to electromagnetic interference, noise, and crosstalk, so they have been widely implemented in low-frequency analog systems, high-speed digital systems, and radio frequency/microwave communication systems [1][2][3][4][5][6]. To date, a large variety of balanced filters have been explored [7][8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

General rotationally symmetric coupled feeding structure and its application to single- and dual-band balanced filters

Wang,

Gao,

Huang

et al. 2024

Phys. Scr.

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This paper proposes a new general rotationally symmetric coupled feeding structure and its applications to the design of single- and dual-band balanced filters for high common-mode (CM) suppression. The balanced feeder consists of two coupling lines coupled with a ring resonator, which can be either a uniform impedance ring resonator or a stepped impedance ring resonator. Under differential-mode (DM) excitation, the voltage distributions of the coupling-line and resonator are both rotationally even-symmetric and the total coupling coefficient adds up, which indicates that the proposed feeding structure can achieve DM transmission characteristic. Under CM excitation, their voltage distributions are rotationally even- and odd-symmetric, respectively, so the total coupling coefficient cancels out to zero and CM suppression property is achieved. For demonstration, four single- and dual-band balanced filters with wide range of CM and harmonic suppression are designed, fabricated, and measured, and the simulation and measured results match well.

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