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Proceedings of papers of the 3rd International Conference on Electrical, Electronic and Computing Engineering IcETRAN 2016, Zlatibor, Serbia, June 13-16, 2016, 2016
— In this paper the improved design of the VHF quadrature hybrid coupler is presented. It is a continuation of the prior work of the same authors, about the design of VHF quadrature hybrid coupler. Knowing, before the production, what are the conditions that coupler has to satisfy, has enabled us to acquire, through computer simulation, the dimensions of the coupler that was later produced. Values of the S-parameters of the simulated coupler are being compared, to values of the S-parameters of the produced coupler to validate the design process. Coupler is designed as a broadside-coupled strip-line coupler, for frequency range from 150 MHz to 200 MHz, with central frequency at 175 MHz. It consists of two overlapping brass strips of equal widths, placed on the top and bottom surface of a Teflon substrate, which is sandwiched between the top and bottom of an aluminum casing and separated from them by air layers of equal thickness. Purpose of the coupler is to combine two input signals in quadrature, who each have 16 KW of power, in to an output signal of 32 KW.
Design of Multiband Hybrid Coupler with Open Circuit Stub
International Journal for Research in Applied Science and Engineering Technology IJRASET, 2020
Directional couplers are passive reciprocal networks. It is a four-port network where all four ports are ideally matched and lossless. The wave incident in port 1 couples power into ports 2 and 3 but not into port 4. Nowadays, these components are essential to all communication systems as they play an important role in the monitoring and measurement of signal samples within an assigned operating frequency. In the first part of the project is to propose a broadside-coupled patch directional coupler. The substrate used is RO4003C with the Ɛr = 3.38 and H = 0.8128 mm or 32 mil. A travelling-wave sectoral slot resonator with three ports is presented in the second part. Computer Simulation Tool (CST) has been used to optimize the magnitude of the directional coupler. The simulated results have agreed well with ideal results. Parameter analysis has been conducted on the proposed directional coupler in order to study the effects of different design parameters. Discussion and recommendation have been made after each parameter analysis.
2012
In this work a 3dB stripline broadside coupler is designed and simulated. Various combinations were tried and final geometry is simulated with a 3-D planar electromagnetic simulation software, Sonnet Suites (1). Simulation results are satisfactory and presented detaily in figures. The coupler can be used in some of L-band and S-band applications.
Design and Simulation of Coupled-Line Coupler with Different Values of Coupling Efficiency Suleiman
2015
In this paper, two coupled-line couplers are designed and simulated using stripline technology. The coupled-line couplers (A and B) are designed with different values of coupling coefficient 6dB and 10dB respectively. Both of circuits have a coupled output port, a through output port and an isolated output port. Moreover, both circuits are tuned to function around 2.45 GHz. The design results are presented by simulation results obtained using ADS 2012.08 (Advanced Design System) software.
Wideband Hybrid Coupler With Electrically Switchable Phase-Difference Performance
IEEE Microwave and Wireless Components Letters, 2017
A wideband hybrid coupler with an adjustable output phase difference with equal power division is proposed. A compact, low-loss and low-cost reconfigurable transmission line with electrically switchable equivalent characteristic impedance and length is introduced and adopted in this design, which is based on a two-section quadrature hybrid structure. Additionally, only two bias points are needed in this hybrid coupler to operate six switches synchronously and provide three output phase differences; 90°and 90 ± a°(a ≤ 30°has been verified). Good matching, isolation, and equal power division are obtained under all phase-difference possibilities. Two examples of a = 15°and 30°are fabricated and measured for 2.4-GHz applications. Testing results demonstrate satisfying properties including the notably stable phase difference with an error less than ±6°over 30% frequency bandwidth. The presented hybrid couplers would be appropriate for Butler matrices to increase the number of possible beams, which will be more than the number of ports.
Design of 5.0-GHz KSTAR lower-hybrid coupler
Fusion Engineering and Design, 2003
The Korean Superconducting Tokamak Advanced Research (KSTAR) tokamak is being constructed to perform long-pulse, high-b , advanced tokamak fusion physics experiments by Korean Basic Science Institute (KBSI). The KSTAR tokamak will use the non-inductive plasma current drive system, lower-hybrid current drive (LHCD) system for lone-pulse operation. A 5.0-GHz microwave coupler is designed for KSTAR LHCD experiments. Four high-power klystrons feed 128 guidelets at front coupler using hundred and twenty 3-dB power dividers including 3-dB power splitters in the coupler. The guidelet has a height of 5.5 cm and the width of 0.55 cm in order for the power flux density not to exceed 4.0 kW/cm 2 at the guidelet. The coupler is constructed by laminating a stack of metal plates milled to waveguide patterns. This paper describes detailed design for the 3-dB power splitter, the fixed-phase shifter, and the taper section composing the coupler. Using the High Frequency Structure Simulator (HFSS) program, we achieved a phase difference of 9/0.58 and a relative power difference less than 0.2% between two vertical guidelets.
Design of 3-dB Hybrid Coupler Based on RGW Technology
IEEE Transactions on Microwave Theory and Techniques, 2017
Hybrid couplers are essential devices in various microwave circuits and systems, such as radar systems and beam forming networks. The development of this device is necessary along with the development of the new communication standards for the most modern guiding structures. One of the most recent and promising guiding technologies is the ridge gap waveguides, which is expected to play an essential role in the millimeter wave and submillimeter wave applications, not only the 5G communications but also other future communication. Therefore, standards are recommended to make use of the highfrequency guiding structures. In this paper, a design procedure for the hybrid couplers is presented. The frequency band of interest is centered at the 15 GHz, which can be deployed for both the 5G mobile communication and the airborne radar applications. The proposed design is fabricated and measured. The measured and simulated results are in excellent agreement.
Miniaturized Broadband Quadrature Hybrid Coupler with Phase Shifter
Progress In Electromagnetics Research Letters
A 3-dB compact hybrid coupler is presented in this paper in an ultra-wideband frequency range from 1.5 GHz to 3.2 GHz with 90 • phase deference between the two output ports. The proposed coupler is formed by two notched elliptically shaped microstrip lines and four phase shifters, which are broadside coupled through an elliptically shaped slot. A combination of impedance matching technique and structural modification then has been employed to increase coupler efficiency. The design is demonstrated assuming a 0.51-mm-thick Rogers RO4350B substrate. Results of simulation and measurements show that the designed device exhibits a coupling of 3 ± 1 dB across the aimed bandwidth. This ultra-wideband coupling is accompanied by smooth isolation in the order of better than 25 dB and return loss in the order of better than 17 dB. The manufactured device including microstrip ports and phase shifters occupy an area of 35 mm × 30 mm × 1.1 mm (0.27λ × 0.23λ × 0.009λ) which makes it a compact suitable device for UHF applications and measurements, specifically measuring and determining isolation in in-band full duplex transceivers, because of its smooth isolation versus frequency and ultra-wideband bandwidth.
Handbook of RF, Microwave, and Millimeter-Wave Components
2012
The following paragraphs are reproduced from the website of the publisher [1]. This unique and comprehensive resource offers you a detailed treatment of the operations principles, key parameters, and specific characteristics of active and passive RF, microwave, and millimeter-wave components. The book covers both linear and nonlinear components that are used in a wide range of application areas, from communications and information sciences, to avionics, space, and military engineering. This practical book presents descriptions and clear examples of the best materials and products used in the field, including laminates, prepregs, substrates; microstrip, coaxial and waveguide transmission lines; fixed and rotating connectors; matching and adjusting elements; frequency filters; phase shifters; and ferrite gates and circulators. Moreover, the book offers you in-depth discussions on microwave switches and matrices, including MEMS technology, solid state and vacuum amplifiers, mixers, modulators and demodulators, and oscillation sources. You also find coverage of the stable frequency synthesizer structure and sources of modulated or noisy signals. Greatly adding to the usefulness of this volume is the inclusion of more than 700 Internet addresses of manufacturers from across the globe.
In this Major Qualifying Project we were tasked by our project sponsor, Skyworks Solutions Inc., to redesign a 90-hybrid coupler with the center frequency of 1.9GHz. The sponsor's requirements for the new design were to increase the bandwidth and decrease the device area. Both of these requirements were met by developing a theoretical model and were then validated by simulations in Agilent's ADS. Additionally Ansys' HFSS was used to model the new design in a 3-D environment where the electric and magnetic radiation fields can be studied. This was a necessary step in order to develop a model accounting for interference originating from the device.