Improvement of Compactness of Low Pass Filter Using New Quasi-Yagi-DGS-Resonator and Multilayer-Technique

Abstract

A novel 1.8 GHz compact microstrip low-pass filter (LPF) based on quasi-yagi defected ground structure (DGS) and compensated capacitors is proposed in this paper. The filter has a very sharp cutoff frequency response with low insertion loss and achieves a wide reject band with overall 20 dB attenuation from 2.8 GHz up to 10 GHz. The equivalent circuit model of Yagi-DGS-unit is derived using AWR software, and the circuit parameters are extracted by using a simple circuit analysis method. The advantage of this structure is that the reject band can be controlled by tuning the dimension of Yagi-arms at higher frequency rang. The proposed 1.8 low-pass filter is designed using microwave office electromagnetic software and fabricated on the RO4003 ceramic structure with dielectric constant of 3.38. The compact filter occupies an area of (0.45λ g × 0.35λ g) with λ g = 44 mm. A comparison between simulation and measurement results confirms the validity of the LPF configuration and design procedure. In order to improve the compactness of the proposed LPF, a new multi-layer method has been employed. Finally, a new minimized LPF-topology 50% more compact than the conventional is realized. 1. Field distribution method. 2. Simulation-comparison method.

LPF/dual-BPF/UWB-BPF reconfiguration utilizing DGS resonators and lumped capacitors

“…With the rapid development of wireless communications, there is an urgent need for designing microwave filters with various behaviors. More studies have been conducted to achieve low-pass response of the filter as well as the bandpass behavior to satisfy the demands of recent wireless technologies with constrained specifications like small occupied area, high selectivity, enhanced roll-off rate, wide rejection band, and low passband insertion loss [1][2][3][4]. There are different techniques to achieve the desired filter behavior such as defected ground structures (DGSs) for achieving wide stopband behavior [5,6] and also it can be used to miniaturize the filter structure [7].…”

Bandpass/bandstop switching with tunable pass band operation based on split ring and open loop resonators

“…The rapid development of technological industries urges manufacturers to implement the newly designed filter as an embedded part of the whole system [1][2][3]. Various studies are conducted to achieve the desired response of the filter with mandatory constraints in the design process such as compactness in size, sharpness in the roll-off rate, simplicity in design, and minimization in passband insertion losses [4][5][6][7][8]. There are many techniques to achieve either a band pass or band reject behaviour including the defected ground structure (DGS), stepped impedance resonator (SIR), open loop resonator (OLR), split ring resonator (SRR), and substrate integrated waveguide (SIW) [9][10][11][12][13][14][15][16][17].…”

Design and Manufacturing of a Novel Compact 2.4 GHZ LPF Using a DGS-DMS Combination and Quasi Octagonal Resonators for Radar and GPS Applications

“…The topology of slit-loaded tapered microstrip resonator cell has been employed in the design of low-pass filter to achieve sharp cutoff frequency, but the stopband suppression level is only 10 dB, and large layout area is also required for the design of this filter [13]. The combination of quasi-Yagi DGS resonator and multilayer technique is used by Boutejdar and Ali to improve the compactness of LPF [14]. A low-pass filter based on combination of defected ground structure (DGS), defected microstrip structure (DMS), and compensated microstrip capacitors is proposed in [15].…”