Design of Microstrip Lowpass Filter with Sharp Roll-off using Elliptical and Radial Resonators

Abstract

A new microstrip lowpass filter with sharp roll-off and high suppression level in stop-band is presented. To achieve the lowpass filter with high performance, coupled T-shaped, elliptical and radial resonators are adopted. New formulas for calculating

Design of a miniaturized planar microstrip Wilkinson power divider withharmonic cancellation

“…The fabricated PD can suppress the 2nd to 14th spurious harmonics by 20,18,13,26,15,21,26,18,16,19,13,17, and 16 (all in dB) respectively. The proposed PD has a fractional bandwidth of about 40%, which is calculated based on [22][23][24][25]. The proposed WPD is compared with related studies in Table 3.…”

“…Also, a neuro-based approach to designing a Wilkinson power divider is published in [22], which is composed of two lowpass filters instead of two quarter wavelength line in conventional circuit. Applying microstrip resonators is useful in designing good performance RF circuits as in [23][24][25][26]. Another Wilkinson power divider with harmonic suppression and bandpass filtering response is suggested in [27], which used open and short stubs and even-odd mode analyses, but this design has a large circuit size.…”

Design of a low pass filter using rhombus-shaped resonators with an analyticalLC equivalent circuit

“…In Xiao et al [9], an LPF is presented, based on a modified complementary split-ring resonator. A new microstrip lowpass filter using coupled T-shaped, elliptical, and radial resonators with features like sharp roll-off and high suppression level in the stopband is presented in Karimi et al [10]. In Mousavi et al [11], a microstrip lowpass filter based on a bend structure with some excellent features such as compact size and high suppression level in the stopband is proposed.…”

“…Emerging technologies, such as wireless communications, WCDMA, and other wideband applications continue to challenge RF/microwave filters with ever more accurate requirements such as higher performance, smaller size, lighter weight, ultrawide stopband, and lower cost [1]. Thereby, various studies have been published to achieve an LPF with the mentioned features [7][8][9][10][11]. A compact LPF with a wide stopband is proposed in Liu et al [7] using hairpin structures and stepped impedance units.…”