Size reduction and harmonic suppression of rat-race hybrid coupler using defected ground structure

Abstract-In this paper, a three-pole bandpass filter (BPF) using a new defected ground structure (DGS) is discussed. The proposed DGS is incorporated in the ground plane under the feed lines and the coupled lines of a bandpass filter to improve the performance of the filter in both passband and stopband. The banpass filter is designed with a center frequency of 1.8 GHz and a bandwidth of 270 MHz. The suppression of better than 20 dB was achieved for frequencies between 2.2 and 5 GHz. A prototype of BPF was fabricated and tested. Prototype measured data was in good agreement with simulation results.

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“…Similarly, DGS resonators can also be used to remove higher-order responses in directional couplers and power combiner/dividers [14][15][16].…”

Section: Dgs Bandpass Filtermentioning

confidence: 99%

Design and Realization of Three-Pole Bandpass Filter With Spurious Response Suppression Using Defected Ground Structures

Zakriti¹,

Touhami²,

Bargach³

et al. 2013

PIER C

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“…1) [10][11][12][13][14][15][16]. DGSs increase the effective values of dielectric constant of substrates (ε eff ), decrease the wavelength and eventually decrease the overall length of the Wilkinson divider.…”

Section: Design Proceduresmentioning

confidence: 99%

Miniaturization of Wilkinson Power Dividers by Using Defected Ground Structures

Oraizi¹,

Esfahlan²

2008

PIER Letters

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Abstract-It is proposed that the application of defected ground structures (DGS) and electromagnetic bandgap (EBG) reduce the phase velocity, increase effective permittivity of microstrips and reduce the effective the wavelength which eventually lead to the reduction of overall length of Wilkinson power dividers. Furthermore, the adjacent strip lines may approach each other, which cause coupling problems. The undesired coupling maybe cancelled by connecting a capacitance in parallel with the isolation resistor of Wilkinson power divider. Application of DGS and EBG will not only reduce the dimensions of the divider, but also improves its scattering parameters.

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“…Nowadays DGS has drawn an increasing interest in antennas and microwave circuits [11,12]. DGS have found numerous applications in the design of microwave circuits, such as antennas, couplers, amplifiers, and filters [13][14][15]. DGS shapes inserted in the ground plane of the transmission lines add the equivalent capacitive and inductive elements to transmission lines, which modify the characteristic impedance and effective dielectric constant, and slow-wave effect produced [16].…”

Section: Introductionmentioning

confidence: 99%

Directivity Enhancement of Miniaturized Directional Coupler using Defected Ground Structure

Bhakhar¹,

Dwivedi²,

Prajapati³

2017

Proceedings of the International Conference on Communication and Signal Processing 2016 (ICCASP 2016)

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Abstract. This research paper investigates about the novel approach in the design and analysis of Couplers operating at 5 GHz, which finds its application for next generation communication systems. The concept of Defected Ground Structure (DGS) in the design of planar coupler is useful for next generation communication systems. The Planar Coupler with an embedded DGS structure is designed for an operating frequency 5 GHz. A convention allow profile planar coupler with an embedded a head dumbbell shaped DGS structure operating at 5 GHz was designed independently and integrated embedded with resonating DGS. The analysis is carried out by varying the dimensions of the DGS. Various electrical performance parameters like transmission coefficient, return loss, coupling factor and isolation have been analytically observed and reproduced for aspirant researchers and designers. The integration of this electromagnetically coupled DGS resulted into significant volumetric reduction of the directional coupler. Incorporating one circular head dumbbell shape reduces the size of ground plane up to 31% while we achieved reduction of 12% in strip-length in comparison to the equivalent conventional coupler. In addition, we found an increase of 127.27% in its directivity compared to conventional counterpart. The effects of variations of DGS dimensions on scattering parameters of this coupler have shown appreciable enhancement. This coupler helps as an inspiration, encouragement and motivation for saving the materials used in designing it, reduces the electrical and RF losses converted into heat and thus a journey towards go-green-earth!

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Size reduction and harmonic suppression of rat-race hybrid coupler using defected ground structure

Cited by 161 publications

References 9 publications

Design and Realization of Three-Pole Bandpass Filter With Spurious Response Suppression Using Defected Ground Structures

Design and Realization of Three-Pole Bandpass Filter With Spurious Response Suppression Using Defected Ground Structures

Miniaturization of Wilkinson Power Dividers by Using Defected Ground Structures

Directivity Enhancement of Miniaturized Directional Coupler using Defected Ground Structure

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