Design of Wide Passband Microstrip Branch-Line Couplers With Multiple Sections

Tang, Ching‐Wen; Tseng, Chien-Tai; Hsu, Ko-Cheng

doi:10.1109/tcpmt.2014.2320499

Cited by 36 publications

(24 citation statements)

References 21 publications

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“…It consists of four modified branch-line couplers (MBLC) and two quasi-Schiffman phase shifters that form a 4 × 4 network. The MBLC design procedure is as follows (Tang et al, 2014;Tseng & Wu, 2012):…”

Section: Feed Network 221 Configuration Of Networkmentioning

confidence: 99%

“…It consists of four modified branch‐line couplers (MBLC) and two quasi‐Schiffman phase shifters that form a 4 × 4 network. The MBLC design procedure is as follows (Tang et al, ; Tseng & Wu, ): Design a conventional double‐box BLC with a 3 dB power division, which operates at a center frequency of 6 GHz. Replace the quarter wavelength horizontal and vertical branches by equivalent π networks with radial stubs and meander line arms, respectively, which decrease the size and increase the bandwidth of the characteristic impedance. …”

Section: Antenna Configurationmentioning

confidence: 99%

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Broadband Planar Aperture‐Coupled Antenna Array for WLAN and ITS Beam‐Steering Applications

2018

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A broadband multilayer beam‐steering antenna array with a modified mushroom‐like radiating element is introduced. The two‐layer aperture‐coupled array consists of four equal sets of mushroom‐like elements, each of which is made of 16 unit cells in a 4 × 4 configuration. The feeding network is a modified quasi‐Butler matrix, which benefits from improved double‐box branch line couplers. The network has an isolation bandwidth between 4 and 7.9 GHz (65%) and a transmission bandwidth from 4.8 to 7.1 GHz (39%), which operates acceptably in most of the C‐band, especially at wireless local area network and Intelligent Transport Systems (ITS). A broadband Butler matrix uses broadband 3 dB couplers and a middle network. The geometry of the element and feeding network is utilized in array form to enhance the impedance bandwidth and radiation efficiency of the antenna. The results show that the antenna impedance bandwidth covers 3.82 to 8.2 GHz (port 1) and 3.8 to 8.28 GHz (port 2) for Snn ≤ −10 dB, which covers the C‐band fully (4–8 GHz). Moreover, it has a 3 dB gain‐bandwidth of 2.25 GHz that extends from 4.65 to 6.9 GHz with a peak value of 13.65 dBi. The antenna array has a 3 dB axial ratio bandwidth of 1.65 GHz that extends from 4.9 to 6.55 GHz and involves wireless local area network (5.15–5.825 GHz) and ITS (5.795–6.400 GHz). The radiation efficiency of the array for both port excitations is in excess of 75% when circular polarization is achieved. Two firing beams at elevation angles of 20° and −35° are obtained for ports 1 and 2 upon excitation, respectively.

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Section: Feed Network 221 Configuration Of Networkmentioning

confidence: 99%

Section: Antenna Configurationmentioning

confidence: 99%

Broadband Planar Aperture‐Coupled Antenna Array for WLAN and ITS Beam‐Steering Applications

2018

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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%

“…In [10] two ring resonators have been integrated to obtain three large microstrip branch line couplers with low performances where undesired coupling factor, isolation, return loss and insertion loss can be seen clearly. In [11] wide passband microstrip branch-line couplers have been designed by cascading several quadrangular loops, which take large implementation area. A microstrip coupler with large circuit size, undesired insertion loss and large phase shift has been offered in [12].…”

Section: Introductionmentioning

confidence: 99%

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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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Coupled‐line rat‐race couplers with smooth in‐phase and out‐of‐phase performances

Wei

Wang

et al. 2022

Int J RF Mic Comp-Aid Eng

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In this paper, a novel rat-race coupler with smooth in-phase and out-of-phase performance is proposed. The structure is based on two sections of strong coupling coupled-lines. A weak coupling coupled-line is connected between the two sections on the upper line in series, and another is connected between the two sections on the lower line in shunt. In the working band, it has strong coupling, good impedance matching, and good isolation. The in-phase and out-ofphase performance is very smooth. It does not require multilayer structures, via-holes, or other complex structures. To verify this idea, a rat-race coupler on the 1.524 mm Rogers RO4350B substrate is realized. The simulated and measured results are in good agreement with the theoretical ones. It can achieve a 10-dB fractional bandwidth of 23.98% (3.12-3.97 GHz) and 45.44% (2.5-3.97 GHz), and maximum phase deviations of ±6 from 2.94 to 4.11 GHz.

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Design of Wide Passband Microstrip Branch-Line Couplers With Multiple Sections

Cited by 36 publications

References 21 publications

Broadband Planar Aperture‐Coupled Antenna Array for WLAN and ITS Beam‐Steering Applications

Broadband Planar Aperture‐Coupled Antenna Array for WLAN and ITS Beam‐Steering Applications

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

Coupled‐line rat‐race couplers with smooth in‐phase and out‐of‐phase performances

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