A novel compact CPW tunable stop band filter using a new Z-DGS-resonator for microwave applications

The paper presents a novel very compact CPW bandstop filter. The designed structure consists of one unit of new Z-DGS resonator, placed on top layer of ground plane between the input and output this structure, which is excited by 50 ohm coplanar line. The designed filter can be used in X-Band applications as the band stop can be shifted to any other desired frequency by tuning the length of the Z-DGS. The proposed filter topology has as benefits good performances in terms of wide stop-band rejection, low insertion loss, high return loss, simple design and more small size (17.908 × 10 mm2) compared to other previous works those reported in literature. The stop-band width is from 3.96GHz to 6.21GHz, exhibits a 22,25 dB rejection bandwidth of 45% with high selectivity characteristic at the center frequency of 5.05 GHz

A novel compact CPW Band-stop filter using O-DGS configuration

A novel and compact multi-band stop filter using two different structures of circular DGS and circular DGS loaded with O-DGS unit, has good selectivity and  wide upper pass band performance  with good rejection based on defected ground structure (DGS) integrating a circular ring  resonator to suppress undesired spurious bands frequency or harmonics in radio frequency and microwave circuits is proposed. An equivalent circuit model has been derived for the both structures of circular DGS and circular DGS loaded. The presented filter has a compact size because the circular ring resonator is integrated in DGS, the both of them are etching in the ground plane. The proposed filter presents an optimization method for generating multi-band characteristics without using a periodic cells or other complicate topology. The simulated results by ADS Agilent are presented and compared with the results simulated by two others software: CST and HFSS. Good agreement between the three simulated results is observed

Development of Compactness of Reconfigurable LPF/BSF Using a Simple Technique for Radar Applications

In this paper a new compact reconfigurable low pass/band stop filter using a miniature omega resonator placed in a small DGS in the ground. The reconfiguration in frequency response can be achieved with the same topology and the same dimensions by changing just the position of channel slot which connect the omega resonator to the metallic ground without any other requirements. Several advantages obtained with this structure based on the use of one omega resonator cell such as simplicity of fabrication, very low insertion loss in the pass bands, a high rejection in the stop band with a sharp transition. This filter is suited for many areas of modern communication applications and microwave technology since it shows a simple frequency reconfiguration with a several benefits such a good wide rejection of out of bands signals, high selectivity, compactness and small losses and seize, with total area of 9.08×10mm2

A Novel Compact CPW Low Pass Filter Using a New Topologie of ZJ-Shaped Slots

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