This fact is used in this thesis by designing a shortslot hybrid coupler in groove gap waveguides, which is based on the techniques of rectangular waveguides. Alma memo 468 designs of wideband 3db branchline couplers. You do have ports 4 and 3 reversed from what the books usually use. Splitters that yield differential outputs are often called magicts. Juan pedro sanchez ripoll design of a sharp response lowpass filter iii abstract the aim of this thesis is to do a research about three microwave design software packages and evaluate them with the purpose of getting the sharpest filter as possible and also know which one is more efficient in this task. In both 2 and 3, the design is restricted by the open stub area which limits. When two transmission lines are close together, because of the interaction of the electromagnetic fields of each line, power can be coupled between the lines.
Design and simulation of coupledline coupler with different values of coupling efficiency 15 of the couplers can be. Design method for quasioptimal multiband branchline couplers. It is one of the worlds leading innovators in high performance analog and mixed signal semiconductors and offers a wide variety of products. The branchline coupler blc is a fundamental component in planar.
A signal applied to port 1 is split into ports 2 and 3 with one of the outputs exhibiting a relative 90 phase shift. Reflection attenuators are one application of branchline couplers. This technique was successfully applied to model a branchline coupler and optimizing its design parameters, with substitution the fine model timeconsuming calculation by the surrogate model, which. Simulation comparison between hfss, cst and wipld for design of dipole. The branchline the simplest type of quadrature coupler, since the circuitry is entirely planar.
Pdf software comparative study for rf power coupler. Design of an asymmetric branchline coupler using implicit. It employs the finite element method fem, adaptive meshing, and brilliant graphics. The concept of implicit space mapping for design optimization was presented. This kind of coupler is frequently performed in microstrip technology or triplaque and is part. This works as a phase shifter to provide reflections which cancel at the input port and sum to a phase shifted version of the input on the fourth port. A singlesection branchline coupler was designed for a center frequency of 5 ghz with an equal power split between the i and q ports. Computeraided design and applications of planar branchline. Solutions to design branchline couplers having more. Compared to the traditional fivebranch hybrid coupler design, this structure has a wider operation bandwidth and the bandwidth is almost the same as traditional sevenbranch hybrid coupler.
A threedimensional view of the waveguide structure is illustrated in fig. Analysis also includes a shielded enclosure with metal lid 100 mils above the surface of the alumina substrate. I am trying to plot gain vs frequency plot in hfss. Implementation details mblcoup implies that coupler is mirror symmetrical relative to horizontal axis see topology. L 3 may provide more feasible design see reference. Coupler branchline couplers called branchline figure 2 are the directional couplers generally used for distribution 3db energy, with a phase difference of 90 between the way direct and the way coupled 12.
The characteristic impedances of slits between the. Senior design engineer, tubitakbilten, metu campus, inonu bulvar. Compared to the traditional five branch hybrid coupler design, this structure has a wider operation bandwidth and the bandwidth is almost the same as traditional seven branch hybrid coupler. Ansys hfss software is the industrystandard simulation tool for 3d fullwave. But, how do we design a coupledline coupler with a specific coupling coefficient c. Ive been trying to design a coupled mircostrip line coupler with only 2 ports. The geometry of the branchline coupler is shown in fig. Design of a sharp response lowpass filter through comparison. In the analysis of the branch line coupler, we consider the scattering matrix of the coupler. I know all about the even and odd modes and the rules that i need to satisfy to achieve the best coupling but i couldnt find any sources on how to actually design and construct the line. A branch line coupler quadrature 90 hybrid is a fourport network device with a 90 phase difference between two coupled ports. The goal of this paper is to analyze, simulate, and design a microstrip quadrature hybrid coupler phase shifter operating at resonant frequency of 1. It contains a sevensection eplane branch line coupler blc used as the quadrature hybrid coupler, followed by two fivesection hplane bpfs with round chamfer, as in fig.
Z 0 characteristic impedance of the overall system. For a 20 dbthree sections edge coupled line directional coupler, constructed as a stripline with ground plane, spacing of b3. The method is based on the usage of equivalent subcircuits input reactances of the evenmode and oddmode excitations. The device can be used for a single antenna transmitterreceiver system or an iq signal splittercombiner. Coupler and power divider design in awr linkedin slideshare. This example shows a microstrip branchline coupler on alumina er 9. In the scope of this paper, a branchline coupler working at 2. A new miniaturized microstrip branchline coupler with.
The design tool is the hfss software which uses the finite element method. The sparameter plots of optimized quadrature hybrid coupler in fig. Atlanta rf software offers the following cae software for synthesis and analysis of directional. The rf and applied electromagnetics lab l31 is equipped with high frequency instruments and tools to explore the rf and applied electromagnetics field. Design of microstrip branch line coupler phase shifter in l. The equivalent model of the branch line coupler are shown in fig. Atlanta rf software continues to expand our product family of rfmicrowave computeraided engineering cae design software for popular directional couplers, with special emphasis on electrical synthesis, dimensional synthesis and frequency analysis.
To achieve a directional coupler with good restraint outside the passband, two wide coupled opencircuited lines are. In chapter 1, the need for this new technology is motivated by explaining the. Also, ring hybrid junction is a fourport network with a 180 degree phase shift between two output ports but it can also be operated so that output ports are in phase. The demand for a smaller 90degree hybrid coupler with a broader bandwidth is. This kind of coupler is frequently performed in microstrip technology or. Your design of directional couplers is well enhanced using our rfmicrowave cae software for the most popular designs needed in your rf circuits.
Computeraided design and applications of planar branch line coupler circuits. A branchline coupler outputs from the coupled port pin 3 a fraction of the power presented at the input pin 1. The designs use siw parameters of low loss dielectric material, rogers ro 4003 with. As it can be seen from the figure, it has a symmetrical four port. This book chapter mainly focuses on analytical analysis for the branchline coupler in which this method provides an explicit solution in the coupler design. In order to find them, we use evenodd mode analysis. At the center frequency the phase difference between the outputs is 90 degrees, with the coupled port representing the quadrature q output and the output port representing the inphase i output. Hybrid 90 simulation agilent advanced system design. A schematic of 5branchline coupler with 10 eplane tjunctions. A branchline coupler is made by two main transmission lines shuntconnected by two secondary branch lines. Pdf microstrip quadrature hybrid branchline coupler cst model.
Heres a clickable index to out material on branchline couplers. Implementation details mblcoup implies that coupler is mirror. This calctown calculator calculates the various parameters related to a branchline coupler circuit. Size and design of broadband coupler semantic scholar. Lange coupler branchline coupler directional coupler 180 deg. Some licensed software are also available to design the high frequency antennas and fabricate as well using pcb fabrication machine. Fourhundred gigahertz broadband multibranch waveguide. Design, simulation and development of wideband directional.
Hfss is a highperformance fullwave electromagnetic em field simulator for arbitrary 3d volumetric passive device modeling. It should be noted that the conductor width of a 150. Current design at skyworks for 90 degree hybrid coupler. This book chapter mainly focuses on analytical analysis for the branch line coupler in which this method provides an explicit solution in the coupler design. Synthesis and analysis of popular rfmicrowave filters provides confidence and clarity to the filter designs you use the most. Design of a 3 db branch line coupler in hfss youtube. However, its out of band characteristic has insucient selectivity for adequate performance as a. Based on the similar idea, mondal and chakrabarty presented a branch line coupler, which has the properties of 42% size reduction at 2. Below we present a lumpedelement quadrature coupler which was optimized to work at 100 mhz. Bandwidth is greater than in interconnected transmission line uncoupled line circuits like the branchline coupler. A novel miniaturized branchline coupler with equivalent. First port is named as input port, second and third ports are output ports and the fourth port is the isolated port. Rat race coupler rrc and baluns are widely used in microwaverf communication circuit. Computeraided design and applications of planar branch.
A schematic of 5 branch line coupler with 10 eplane tjunctions is shown in fig. To achieve a directional coupler with good restraint outside the passband, two wide coupled opencircuited lines are employed instead of two microstrip line branches. Based on the similar idea, mondal and chakrabarty presented a branchline coupler, which has the properties of 42% size reduction at 2. This is a great question and it takes a little explanation to do it justice. These products are used in military, medical, automotive, and handset applications around the world 1. Pdf microstrip quadrature hybrid branchline coupler parametric cst. This video demonstrates the enhanced link between microwave office circuit design software and ansys hfss 3d fem em analysis that enables designers to seamlessly tie hfss extracted s. Rrc is used for combining the power and also as an equal power splitter between two. A branch line coupler is made by two main transmission lines shuntconnected by two secondary branch lines. Design and validation of miniaturize rat race coupler based. Fourhundred gigahertz broadband multibranch waveguide coupler. In 3, compact blc design was introduced by adding open stubs at the center of branch lines of the traditional design.
A schematic of 5branchline coupler with 10 eplane tjunctions is shown in fig. Synthesize and analyze these popular directional couplers with confidence using ars couplers, before you build them. A ideal singlebox branchline coupler is shown below. Using zeland software program, s 11 can be calculated as. The broadband branchline coupler is designed in stripline technology which has two conductors and a homogeneous. A schematic of 5 branch line coupler with 10 eplane tjunctions. Design of 10 db 90 branch line coupler using microstrip line with. I have build the line in hfss but the coupling isnt there to a satisfactory level, i want to get the s21 parameter above 5db. Using hfss software to study the effect of the tumor size on the output signal using transient soultion type. Currently, marki microwave offers 180 degree hybrid couplers as custom. A reducedsize branch line coupler blc was presented in 2 by incorporating a radial stub in the center of each branch. Feb 12, 2017 design of a 3 db branch line coupler in hfss.
The remainder of the power is passed through to the output port pin 2. Computeraided design and applications of planar branchline coupler circuits. Sep 19, 2016 this video demonstrates the enhanced link between microwave office circuit design software and ansys hfss 3d fem em analysis that enables designers to seamlessly tie hfss extracted sparameters. This paper reports for magic tee that a signal incident on the difference port splits equally between ports 2 and 3, but the resulting signals are 180 degrees out of phase. A new miniaturized microstrip branchline coupler with wide. In this paper, multisection coupler technique is used to improve the performance of the coupler. With the purpose of investigating characteristics of branchline couplers, this project aims to designing and fabricating a branchline coupler ful. Power dividers propagation downloads links site map. It is realized in stripline, showing great agreement with the simulation and design format. In the analysis of the branchline coupler, we consider the scattering matrix of the coupler.
Refer to design assistant in the filter designguide. Compact tunable 3 db hybrid and ratrace couplers with. Specifically, the 90 degree hybrid coupler is utilized in the handset infrastructure because it offers lowloss, high isolation, and exceptional phase and amplitude balance. Ars filters product family includes lowfrequency lumpedelement filters thru highfrequency distributed filters in stripline, microstrip and waveguide. Couplerline coupling coefficient specification table 2. A lband design of microstrip branch line coupler phase. If the input is port 1, then the through port is port 2, the coupled port is port 3, and the isolation port is port 4. Tryout our demo software to learn more your design of directional couplers is well enhanced using our rf. Aug 29, 2014 the goal of this paper is to analyze, simulate, and design a microstrip quadrature hybrid coupler phase shifter operating at resonant frequency of 1. Design and simulation of magic tee and ring hybrid coupler.
A singlesection branch line coupler was designed for a center frequency of 5 ghz with an equal power split between the i and q ports. Design and validation of miniaturize rat race coupler. A tutorial on using keysight advanced design system ads to design a branch line coupler. Design of microstrip branch line coupler phase shifter in. Citeseerx document details isaac councill, lee giles, pradeep teregowda. The coupledline couplerif our design rules are followedresults in an ideal directional coupler. Examples of magict circuits are the ratrace coupler, the asymmetric tandem coupler, and the parallel coupled line magict. Novel broadband 3db directional coupler design method.
The coupler is designed on software advanced system design ads. The geometry of the branch line coupler is shown in fig. A schematic diagram of conventional quadrature hybrid or branch line coupler. It acts as a building block in rf circuit such as single ended power amplifier, frequency multipliers, balanced mixers etc. A novel broadband 3db directional coupler design method utilizing hfss and realization are given in this paper. Based on this model, the performance of the coupler is optimised by hfss software. Single section coupler design1 the design equations for single section coupler are as follows. This paper reports for magic tee that a signal incident on the difference port splits equally between ports. Figure 2 presents the design parameters for the microstriptosiw coupler. For a more detailed discussion of this device, see. The objective of this model is to compute the sparameters and to observe the matching, isolation, and.
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