X‐band 1/4 λ dielectric‐strip resonator filter

Abstract

A novel quarter-guided-wavelength (1/4λ) dielectric-strip resonator (DSR) with one short-circuited end is proposed to design a compact and low-loss filter at X-band. One end of the DSR is metallised and then shorted to ground effectively to achieve a half-cut conversion from 1/2λ DSR. As a result, the resonator length is reduced by half while the unloaded quality factor (Q u) of the 1/4λ DSR only has a slight reduction as compared to the corresponding 1/2λ DSR. For demonstration, a third-order DSR bandpass filter centred at 10.45 GHz is designed, implemented and measured. Good agreement between simulated and measured results can be obtained, showcasing the advantages of compact size and low loss.

Design of C band Bandpass Filter using Fractal based Symmetrical Ring Resonator

“…An effective dielectric constant εe is taken into account in the analysis because some of the dielectric region field lines are in the air, do not fill the air region above the strip. The effective dielectric constant 'εe' and line impedance is calculated using [1][2][3] to design an allpass filter with proper impedance matching.…”

“…A customizable 3D printed insert is designed and positioned into a standard WR-90 waveguide to realize an inline waveguide filter is reported in [1], which is dimensionally large. Quarter wavelength dielectric strip resonator filter with one short circuited end is proposed in [2], which has low FBW. Fractal shaped irises are applied to waveguide bandpass filter is presented in [3] but has less FBW.…”

A dielectric resonator bandpass filter using printed circuit board technology for wideband application

“…The first technology as shown in Figure 1A is using individual dielectric ceramic as resonator loaded in the metallic cavity to realize single-ended bandpass filter [9][10][11][12][13] and balanced bandpass filter, [14][15][16] which is difficult to integrate with other planar circuits. For easily integrating with other planar circuits, the second technology as shown in Figure 1B [17][18][19][20] using individual dielectric ceramic as resonator mounted on the low dielectric constant substrate in the metallic cavity is proposed. These two common technologies of dielectric resonator bandpass filter all use high dielectric constant and high quality-factor (Q) dielectric ceramic resonator, which results in high cost and narrow operating fractional bandwidth (<6%) except Reference 13 (around 9%).…”