Miniaturization and bandwidth enhancement of a loose coupler by DGS

Bhowmik, Priyansha; Moyra, Tamasi; Deb, Partha Kumar

doi:10.1109/spin.2015.7095278

Cited by 3 publications

(2 citation statements)

References 2 publications

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“…The distance of the stub impedance of the proposed BLC design is defined as L 1. Referring back to the common matching technique that employs the stub 23 , the load impedance, Z L representing the BLC can be expressed as (11):…”

Section: Andmentioning

confidence: 99%

5G planar branch line coupler design based on the analysis of dielectric constant, loss tangent and quality factor at high frequency

Shukor

Seman

2020

Sci Rep

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This study focuses on the effect of different dielectric properties in the design of 3-dB planar branch line coupler (BLC) using RT5880, RO4350, TMM4 and RT6010, particularly at high frequency of 26 GHz, the fifth generation (5G) operating frequency. The analysis conducted in this study is based on the dielectric constant, loss tangent and quality factor (Q-factor) associated with the dielectric properties of the substrate materials. Accordingly, the substrate that displayed the best performance for high frequency application had the lowest dielectric constant, lowest loss tangent and highest Q-factor (i.e., RT5880), and it was chosen to enhance our proposed 3-dB BLC. This enhanced 3-dB BLC was designed with the inclusion of microstrip-slot stub impedance at each port for bandwidth enhancement, and the proposed prototype had dimensions of 29.9 mm × 19.9 mm. The design and analysis of the proposed 3-dB BLC were accomplished by employing CST Microwave Studio. The performance of scattering parameters and the phase difference of the proposed BLC were then assessed and verified through laboratory measurement.

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Section: Andmentioning

confidence: 99%

5G planar branch line coupler design based on the analysis of dielectric constant, loss tangent and quality factor at high frequency

Shukor

Seman

2020

Sci Rep

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“…The work in [2] have used folded structure, in [3] fractal construction, stepped impedance resonators [4] and artificial transmission lines [5] for size reduction of the hybrid couplers. To enhance the bandwidth of hybrid coupler techniques employed include defect ground structure (DGS) [6], slot line [7] and multilayer AMC based design [8]. The existing techniques either focus on miniaturization or bandwidth improvement and/or both in some cases.…”

Section: Introductionmentioning

confidence: 99%

A wideband miniaturized 3 dB hybrid coupler for passive beam switching application

Kazim

Abbas

Rehman

et al. 2021

2021 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting (APS/URSI)

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This paper proposes a wideband miniaturized 3 dB 90˚ hybrid coupler for passive beam switching application. The hybrid coupler is usually employed in an antenna array feed network in a butler matrix. For ease of fabrication and measurement, the operating frequency of the hybrid 90˚ coupler is designed from 700-960 MHz. Hence, an operating bandwidth of around 30% is achieved at the center frequency of 830 MHz. A size reduction of 83% is accomplished along with a fractional bandwidth of 30% by carefully adopting a meander structure with optimized spacing to enhance the capacitance within the structure. The proposed design is fabricated on Rogers 4360 substrate and measured results of the prototype show good agreement with simulated results.

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