Design of Wideband Rectangular-Shaped Coupler with Virtual Short Stubs for Wireless Communication Applications

Ghazali, S. N. A. M.; Seman, Norhudah; Rahim, Mohamad Kamal A.; Rahim, S. K. A.; Yusof, Khairul Huda

doi:10.1007/s11277-013-1280-z

Cited by 6 publications

(6 citation statements)

References 18 publications

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“…2 and 3, respectively. This coupler as reported in [11] enhanced the return loss and isolation performance of initial three-section rectangular-shaped design in [12]. Where, the additional virtual short stub is attached to the top and bottom patch of middle section.…”

Section: Reflection Coefficient Of Termination Loadmentioning

confidence: 90%

Quadrature Phase Shift Keying (QPSK) Modulator Design using Multi-Port Network in Multilayer Microstrip-Slot Technology for Wireless Communication Applications

Seman¹,

Ghazali²

2015

RADIOENGINEERING

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Abstract. The design of the quadrature phase shift keying (QPSK) modulator by using a multi-port network is proposed in this article for the use in wireless communication applications. The multi-port network is in the form of multilayer microstrip-slot technology. This multi-port network is composed of three 3-dB rectangular-shaped directional couplers with virtual stubs and an equal power division divider with in-phase characteristic. The design is performed by applying a full-wave electromagnetic simulation software, CST Microwave Studio (CST MWS). Keysight's Advanced Design System (ADS) is applied in analyzingand evaluating the QPSK constellation of the proposed modulator. This comparatively small size of proposed design has been fabricated, and its wideband performance of 2 to 6 GHz is verified.

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Section: Reflection Coefficient Of Termination Loadmentioning

confidence: 90%

Quadrature Phase Shift Keying (QPSK) Modulator Design using Multi-Port Network in Multilayer Microstrip-Slot Technology for Wireless Communication Applications

Seman¹,

Ghazali²

2015

RADIOENGINEERING

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“…This better performance is contributed by the smoother impedance transitions that realized by the introduction of two step-impedances in the design. Furthermore, the steps attached to the square-shaped microstrip patches enforce the maximum electromagnetic power flow through the slotline which results in greater coupling efficiency and impedance matching [21].…”

Section: Comparison Of the Square-shaped Phase Shiftermentioning

confidence: 99%

Design of ultra wideband phase shifter with improved scattering parameter performances

Zaidel

Rahim

Seman

et al. 2016

2016 International Conference on Advances in Electrical, Electronic and Systems Engineering (ICAEES)

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Abstract-Aiming to achieve Ultra Wideband (UWB) performance, this paper presents an improvement of the squareshaped phase shifter design, which covers from 2.8 GHz to 10.6 GHz by implementing step impedances in order to improve the impedance matching of the phase shifter, whilst leads to better scattering parameter results. The phase shifter design is formed by using multilayer technique where 3 layers of conductors are interleaved with 2 layers of substrates between each of the conductor's layer. This technique ensures the phase shifter design to be small in size. Computer Simulation Technology (CST) Microwave Studio is used in developing the design and optimization stage. Meanwhile the measurement is done by using Vector Network Analyzer (VNA). The square-shaped phase shifter with step impedances enhances the bandwidth up to 34% as compared to the conventional square-shaped phase shifter. Additionally, analysis on air gap and alignment is also presented in order to show how both conditions affect the performance of the proposed phase shifter design.

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“…Introduction: Broadband microwave directional couplers are widely used in microwave subsystems [1]. Among all kinds of broadband directional couplers, the slot-coupled directional couplers are preferable because of their tight coupling and compactness [2][3][4][5][6][7][8]. In such couplers, the upper and lower microstrip lines are connected to two patches and the patches are coupled through a slot which is cut in a common ground plane.…”

mentioning

confidence: 99%

“…In the slot-coupled directional couplers that have first been proposed by Tanaka et al [2], both the patches and the slot are rectangular in shape. Since then, many different patch and slot shapes for such couplers have been proposed in the literature [3][4][5][6][7][8]. The slot-coupled directional couplers with the elliptically shaped slot and patches have been proposed to cover the ultra-wide frequency band [3].…”

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confidence: 99%

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Improving isolation of slot‐coupled directional couplers

Moradian¹

2015

Electron. lett.

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A suitable method is introduced to improve the isolation of slotcoupled directional couplers. The proposed coupler consists of two trapezoidal-shaped patches that are coupled through a trapezoidalshaped slot in a common ground plane. The inherent phase velocity differences between the even-and odd-modes of the slot-coupled directional coupler are compensated around the centre frequency of the coupler by introducing some slots to the trapezoidal-shaped patches. A design graph is derived by sweeping some dimensions of the coupler. A hatched area is also added to the design graph that indicates the appropriate coupler dimensions which lead to the equal even-and odd-mode phase velocities around the centre frequency. To demonstrate the effectiveness of the proposed coupler, an 8 dB coupler operating from 1 to 3.3 GHz is designed and constructed. The measurement results are in good agreement with the simulation results. The results show that the isolation of the designed coupler has improved significantly in comparison with the other designed coupler with no cut slots in the patches.

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Design of Wideband Rectangular-Shaped Coupler with Virtual Short Stubs for Wireless Communication Applications

Cited by 6 publications

References 18 publications

Quadrature Phase Shift Keying (QPSK) Modulator Design using Multi-Port Network in Multilayer Microstrip-Slot Technology for Wireless Communication Applications

Quadrature Phase Shift Keying (QPSK) Modulator Design using Multi-Port Network in Multilayer Microstrip-Slot Technology for Wireless Communication Applications

Design of ultra wideband phase shifter with improved scattering parameter performances

Improving isolation of slot‐coupled directional couplers

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