Z 0 characteristic impedance of the overall system. 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. 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. Synthesis and analysis of popular rfmicrowave filters provides confidence and clarity to the filter designs you use the most. Power dividers propagation downloads links site map. Reflection attenuators are one application of branchline couplers. 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. Hfss is a highperformance fullwave electromagnetic em field simulator for arbitrary 3d volumetric passive device modeling.
The characteristic impedances of slits between the. Rrc is used for combining the power and also as an equal power splitter between two. You do have ports 4 and 3 reversed from what the books usually use. Lange coupler branchline coupler directional coupler 180 deg. Figure 2 presents the design parameters for the microstriptosiw coupler. Senior design engineer, tubitakbilten, metu campus, inonu bulvar. Design of microstrip branch line coupler phase shifter in. Design of a sharp response lowpass filter through comparison. For a 20 dbthree sections edge coupled line directional coupler, constructed as a stripline with ground plane, spacing of b3. It should be noted that the conductor width of a 150. Design of an asymmetric branchline coupler using implicit.
A schematic of 5branchline coupler with 10 eplane tjunctions. The exact design formulas for three options of the dualband coupler with different location and number of. 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. Shortslot hybrid coupler in gap waveguides at 38 ghz. For a more detailed discussion of this device, see. The branchline coupler blc is a fundamental component in planar. Refer to design assistant in the filter designguide. A branch line coupler is made by two main transmission lines shuntconnected by two secondary branch lines. 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. The rf and applied electromagnetics lab l31 is equipped with high frequency instruments and tools to explore the rf and applied electromagnetics field.
Currently, marki microwave offers 180 degree hybrid couplers as custom. Based on the similar idea, mondal and chakrabarty presented a branch line coupler, which has the properties of 42% size reduction at 2. It employs the finite element method fem, adaptive meshing, and brilliant graphics. This book chapter mainly focuses on analytical analysis for the branchline coupler in which this method provides an explicit solution in the coupler design. Tryout our demo software to learn more your design of directional couplers is well enhanced using our rf. Splitters that yield differential outputs are often called magicts. The remainder of the power is passed through to the output port pin 2. Computeraided design and applications of planar branch line coupler circuits. The device can be used for a single antenna transmitterreceiver system or an iq signal splittercombiner. A novel miniaturized branchline coupler with equivalent. Alma memo 468 designs of wideband 3db branchline couplers.
Design of microstrip branch line coupler phase shifter in l. Size and design of broadband coupler semantic scholar. Using hfss software to study the effect of the tumor size on the output signal using transient soultion type. A tutorial on using keysight advanced design system ads to design a branch line coupler. This kind of coupler is frequently performed in microstrip technology or triplaque and is part. Simulation comparison between hfss, cst and wipld for design of dipole. A ideal singlebox branchline coupler is shown below. A schematic of 5branchline 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.
Coupler and power divider design in awr linkedin slideshare. As it can be seen from the figure, it has a symmetrical four port. This is a great question and it takes a little explanation to do it justice. Specifically, the 90 degree hybrid coupler is utilized in the handset infrastructure because it offers lowloss, high isolation, and exceptional phase and amplitude balance. The branchline the simplest type of quadrature coupler, since the circuitry is entirely planar. A branch line coupler quadrature 90 hybrid is a fourport network device with a 90 phase difference between two coupled ports. Compact tunable 3 db hybrid and ratrace couplers with. It is realized in stripline, showing great agreement with the simulation and design format. The demand for a smaller 90degree hybrid coupler with a broader bandwidth is. Based on this model, the performance of the coupler is optimised by hfss software. A lband design of microstrip branch line coupler phase.
The broadband branchline coupler is designed in stripline technology which has two conductors and a homogeneous. Implementation details mblcoup implies that coupler is mirror. Rat race coupler rrc and baluns are widely used in microwaverf communication circuit. In the analysis of the branchline coupler, we consider the scattering matrix of the coupler. But, how do we design a coupledline coupler with a specific coupling coefficient c. Pdf microstrip quadrature hybrid branchline coupler cst model.
The coupler is designed on software advanced system design ads. Implementation details mblcoup implies that coupler is mirror symmetrical relative to horizontal axis see topology. Synthesize and analyze these popular directional couplers with confidence using ars couplers, before you build them. 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. L 3 may provide more feasible design see reference. In chapter 1, the need for this new technology is motivated by explaining the. A schematic of 5 branch line coupler with 10 eplane tjunctions. The objective of this model is to compute the sparameters and to observe the matching, isolation, and. The concept of implicit space mapping for design optimization was presented.
Computeraided design and applications of planar branch. Ansys hfss software is the industrystandard simulation tool for 3d fullwave. A reducedsize branch line coupler blc was presented in 2 by incorporating a radial stub in the center of each branch. The geometry of the branch line coupler is shown in fig. 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 the analysis of the branch line coupler, we consider the scattering matrix of the coupler. In this paper, multisection coupler technique is used to improve the performance of the coupler. 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.
Ars filters product family includes lowfrequency lumpedelement filters thru highfrequency distributed filters in stripline, microstrip and waveguide. The sparameter plots of optimized quadrature hybrid coupler in fig. Using zeland software program, s 11 can be calculated as. Citeseerx document details isaac councill, lee giles, pradeep teregowda. This kind of coupler is frequently performed in microstrip technology or. 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. Based on the similar idea, mondal and chakrabarty presented a branchline coupler, which has the properties of 42% size reduction at 2. A schematic diagram of conventional quadrature hybrid or branch line coupler. Analysis also includes a shielded enclosure with metal lid 100 mils above the surface of the alumina substrate. Your design of directional couplers is well enhanced using our rfmicrowave cae software for the most popular designs needed in your rf circuits. It is one of the worlds leading innovators in high performance analog and mixed signal semiconductors and offers a wide variety of products. Solutions to design branchline couplers having more.
Design of 10 db 90 branch line coupler using microstrip line with. Design method for quasioptimal multiband branchline couplers. Design and simulation of magic tee and ring hybrid coupler. Couplerline coupling coefficient specification table 2. 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 signal applied to port 1 is split into ports 2 and 3 with one of the outputs exhibiting a relative 90 phase shift. Computeraided design and applications of planar branchline coupler circuits. A natural consequence of coupled lines is a quadrature phase response. 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.
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. 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 novel broadband 3db directional coupler design method utilizing hfss and realization are given in this paper. In order to find them, we use evenodd mode analysis. These products are used in military, medical, automotive, and handset applications around the world 1. A threedimensional view of the waveguide structure is illustrated in fig. Design and validation of miniaturize rat race coupler. Novel broadband 3db directional coupler design method. 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.
Fourhundred gigahertz broadband multibranch waveguide. A branchline coupler outputs from the coupled port pin 3 a fraction of the power presented at the input pin 1. The coupledline couplerif our design rules are followedresults in an ideal directional coupler. 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. With the purpose of investigating characteristics of branchline couplers, this project aims to designing and fabricating a branchline coupler ful. The design tool is the hfss software which uses the finite element method. Pdf microstrip quadrature hybrid branchline coupler parametric cst. To determine the scattering parameters of branch line coupler.
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. Design and simulation of coupledline coupler with different values of coupling efficiency 15 of the couplers can be. Design of a 3 db branch line coupler in hfss youtube. I am trying to plot gain vs frequency plot in hfss. However, its out of band characteristic has insucient selectivity for adequate performance as a.
Structure of a branchline coupler the geometry of a branchline coupler is shown in. A branchline coupler is made by two main transmission lines shuntconnected by two secondary branch lines. Fourhundred gigahertz broadband multibranch waveguide coupler. Ive been trying to design a coupled mircostrip line coupler with only 2 ports. 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. Computeraided design and applications of planar branchline. A new miniaturized microstrip branchline coupler with wide. Feb 12, 2017 design of a 3 db branch line coupler in hfss. Below we present a lumpedelement quadrature coupler which was optimized to work at 100 mhz. The equivalent model of the branch line coupler are shown in fig. The method is based on the usage of equivalent subcircuits input reactances of the evenmode and oddmode excitations. To achieve a directional coupler with good restraint outside the passband, two wide coupled opencircuited lines are.
The geometry of the branchline coupler is shown in fig. Bandwidth is greater than in interconnected transmission line uncoupled line circuits like the branchline coupler. In both 2 and 3, the design is restricted by the open stub area which limits. 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. In the scope of this paper, a branchline coupler working at 2. Design and validation of miniaturize rat race coupler based.
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. Heres a clickable index to out material on branchline couplers. Pdf software comparative study for rf power coupler. Atlanta rf software offers the following cae software for synthesis and analysis of directional. Examples of magict circuits are the ratrace coupler, the asymmetric tandem coupler, and the parallel coupled line magict. Hybrid 90 simulation agilent advanced system design. The capability of implementing dualband branchline couplers by means of composite rightlefthanded transmission lines has also been demonstrated in 1921. This paper reports for magic tee that a signal incident on the difference port splits equally between ports. A new miniaturized microstrip branchline coupler with.
A singlesection branchline coupler was designed for a center frequency of 5 ghz with an equal power split between the i and q ports. A schematic of 5 branch line coupler with 10 eplane tjunctions is shown in fig. This example shows a microstrip branchline coupler on alumina er 9. 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. Single section coupler design1 the design equations for single section coupler are as follows.
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. 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, simulation and development of wideband directional. The designs use siw parameters of low loss dielectric material, rogers ro 4003 with. Branchline coupler calculator online branchline coupler. In 3, compact blc design was introduced by adding open stubs at the center of branch lines of the traditional design. Current design at skyworks for 90 degree hybrid coupler. When two transmission lines are close together, because of the interaction of the electromagnetic fields of. First port is named as input port, second and third ports are output ports and the fourth port is the isolated port. Some licensed software are also available to design the high frequency antennas and fabricate as well using pcb fabrication machine. This calctown calculator calculates the various parameters related to a branchline coupler circuit. The insertion of slots with various forms on the radiation element allows the creation of new resonances frequencies.
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