New Low-Pass Filter Design Using Compensated Microstrip Capacitor and Coupled Meander Defected Ground Structure (DGS)

Abstract

In this paper, we propose a new compact DGS lowpass filter with broad stop-band and low insertion loss in the pass-band. The philosophy of the structure behind this new microstrip low-pass filter is simple as it is composed of a pair of meander DGS-slots and open-stubs. The direct electromagnetic coupling and slow-wave effect have been employed to design the proposed filter using DGS and multilayer method. The optimized low-pass filter has shown higher compactness, broad stop-band and sharp transition characteristics. The design equations are derived using a lumped-element equivalent circuit model of a parallel L-C resonator. In order to validate the feasibility of the proposed design, a low-pass filter with 0.1-dB ripple is designed, fabricated, and measured. The experimental results have shown a good agreement with the simulation and analytical results.

Microstrip filter with defected ground structure: a close perspective

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Fig. 2.Different DGS geometries: (a) dumbbell-shaped [17, 18], (b) circular head dumbbell, (c) arrow head dumbbell [42], (d) U-shaped [21, 43], (e) H-shaped [22], (f) square heads connected with U-slots [21], (g) square slots connected with narrow slot at edge [44], (h) cross-shaped [22, 23], (i) inter-digital [45], (j) Fractal [27], (k) open loop dumbbell [17], (l) L-shaped [46], (m) meander lines [44, 47], (n) U-head dumbbell [44], (o) double equilateral U [48], (p) V-shaped [21], (q) split-ring resonators [25, 26], (r) concentric ring shaped [24], (s) half-circle [49], and (t) spiral-shaped [20].

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Band-Notched Dual-Polarized Antennas for 2G/3G/4G/5G Base Station Using the GCPW DGS-DMS Hybrid Filter

“…The philosophy of DGS bandstop filter unit is that the unit is composed of a DGS resonator and an open-stub used as a compensating capacitor [26], [27]. According to work [26], the double-turn DGS resonator are adopted to realize smaller size.…”

“…According to work [26], the double-turn DGS resonator are adopted to realize smaller size. The traditional DGS resonator model can be equivalent to a parallel RLC circuit [28], [29]. The values of resistance, inductance and capacitance of the parallel circuit can be calculated by using the relevant parameters in electromagnetic (EM) simulation and equations ( 1)-( 3), where f0 is the resonant frequency, fc is the cutoff frequency, and Z0 is the characteristic impedance of the GCPW transmission line.…”