Miniaturization and harmonic suppression of the branch-line coupler based on radial stubs

Hazeri, Ali Reza; Kashaninia, Alireza; Faraji, Tayeb; Arani, Morteza Firouzi

doi:10.1587/elex.8.736

Cited by 13 publications

(12 citation statements)

References 13 publications

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“…Microstrip couplers are favorite devices due to their low cost, planar structure and easy to integrate. According to these, many RF couplers have been introduced using various microstrip structures [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. In [1] and [2] two compact microstrip branch line couplers have been designed for operating in 2.4 GHz and 5.7 GHz WLANs, respectively.…”

Section: Introductionmentioning

confidence: 99%

Microstrip Hybrid Coupler with a Wide Stop-Band Using Symmetric Structure for Wireless Applications

Rezaei

Noori

2018

J. Microw. Optoelectron. Electromagn. Appl.

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In this paper, a wide stop-band microstrip coupler is presented. The proposed structure consists of coupled lines and step impedance cells, which are integrated to operate at 2.82 GHz for wireless applications. This coupler is formed by a symmetric structure so that the locations of the output ports relative to input are quite similar. Accordingly, the magnitudes (also phases) of S 21 and S 31 overlap each other so that input signal can be selected through the output ports equally. There are little differences between the magnitudes and phases of S 21 and S 31 so that 0.97˚ phase shift is obtained. In comparison with previous works, the performance of the introduced coupler is improved. To get a better isolation, return loss and harmonic attenuation the frequency response is optimized without significant increase in circuit size. Moreover, the first, second and third harmonics of S 21 and S 31 are well attenuated as well as a wide stop-band is obtained up to 15.1 GHz. The realized coupler is fabricated and measured. There is a good agreement between simulated and measured results, which confirms the design process.

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Section: Introductionmentioning

confidence: 99%

Microstrip Hybrid Coupler with a Wide Stop-Band Using Symmetric Structure for Wireless Applications

Rezaei

Noori

2018

J. Microw. Optoelectron. Electromagn. Appl.

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“…As a result, the conventional QHCs are very bulky for practical use. 1 In recent years, different microstrip transmission line concepts [2][3][4][5][6][7] have been proposed for the design of hybrid couplers with compact size. However, some of these structures are very complex to realize; thus, even though the overall area is reduced, there seems to be an increase in the overall width of the structure.…”

Section: Introductionmentioning

confidence: 99%

“…When compared to other presented microstrip QHC designs in Refs. [3][4][5][6][7] , the USTL design achieves a good size reduction with even better performance. Moreover, it could be easily incorporated in modern wireless communication systems, due to its compactness and simple practical realization.…”

Section: Introductionmentioning

confidence: 99%

Miniaturized quadrature hybrid couplers based on novel U‐shaped transmission lines

Olukoya

Ilić

Basu

et al. 2018

Micro & Optical Tech Letters

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In this paper, a miniaturized microstrip quadrature hybrid coupler (QHC) using U‐shaped transmission lines (USTLs) is presented. The proposed approach replaces all arms of the conventional QHC with its equivalent USTL to achieve compactness. The proposed coupler structure is designed to operate in the 1.5 GHz (1427‐1518 [MHz]) band which is one of the 5G bands of interest. At such low RF/microwave bands below 3‐4 GHz, the size of the conventional coupler is considerably very large which raises a concern for the next generation networks. The proposed coupler is designed, simulated and fabricated using Rogers 5880 with thickness of 0.79 mm, dielectric constant (εr) of 2.2 and loss tangent of 0.0021. The proposed QHC size is 70% smaller in circuit area (30% relative area) than the conventional equivalent. Simulation and measured results are presented and good matching between the results is observed, confirming the outstanding coupler performance properties. The proposed miniaturized QHC structure will play a vital role for next generation 4G and 5G wireless communication systems operating below 6 GHz.

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“…In [17][18], radius stub is added at the centre of each branch consecutively which suppress upper order harmonics of the resonating wave. A radial stub also has been widely implemented in the filter design with no spurious resonances [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

3-dB Branch-line coupler using coupled line radial stub with no restriction on coupling power

Jizat

Isa

Francisca

et al. 2015

2015 IEEE 12th Malaysia International Conference on Communications (MICC)

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Investigation on the design of coupled line radial stub towards 3-dB branch-line coupler (BLC) operating for fourth generation (4G) Long Term Evolution (LTE) at 3.5 GHz has been presented in this paper. The investigation involves different parameter value of the radius of radial stub and coupled line length at the series and shunt arm of 3-dB BLC designs specifically without restriction on the coupling power performance. The designed BLC was simulated using Rogers RO4003C substrate with thickness of 0.508 mm and dielectric constant of 3.38. The results for proposed radial stub BLC were being compared in terms of S-parameter and phase difference. The comparison shows that 3-dB BLC with radial shaped stub optimized to 79% reduction compared to conventional design without having to compromise the performance result especially with no restriction on the coupling power.

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Miniaturization and harmonic suppression of the branch-line coupler based on radial stubs

Cited by 13 publications

References 13 publications

Microstrip Hybrid Coupler with a Wide Stop-Band Using Symmetric Structure for Wireless Applications

Microstrip Hybrid Coupler with a Wide Stop-Band Using Symmetric Structure for Wireless Applications

Miniaturized quadrature hybrid couplers based on novel U‐shaped transmission lines

3-dB Branch-line coupler using coupled line radial stub with no restriction on coupling power

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