This kind of coupler is frequently performed in microstrip technology or. Pdf microstrip quadrature hybrid branchline coupler parametric cst. Ars filters product family includes lowfrequency lumpedelement filters thru highfrequency distributed filters in stripline, microstrip and waveguide. Design of a sharp response lowpass filter through comparison. The rf and applied electromagnetics lab l31 is equipped with high frequency instruments and tools to explore the rf and applied electromagnetics field. 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. 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. Pdf software comparative study for rf power coupler. Bandwidth is greater than in interconnected transmission line uncoupled line circuits like the branchline coupler.
These products are used in military, medical, automotive, and handset applications around the world 1. A new miniaturized microstrip branchline coupler with wide. Design of 10 db 90 branch line coupler using microstrip line with. A new miniaturized microstrip branchline coupler with.
With the purpose of investigating characteristics of branchline couplers, this project aims to designing and fabricating a branchline coupler ful. This calctown calculator calculates the various parameters related to a branchline coupler circuit. 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. Hfss is a highperformance fullwave electromagnetic em field simulator for arbitrary 3d volumetric passive device modeling. The demand for a smaller 90degree hybrid coupler with a broader bandwidth is. It should be noted that the conductor width of a 150. Single section coupler design1 the design equations for single section coupler are as follows. Currently, marki microwave offers 180 degree hybrid couplers as custom. To achieve a directional coupler with good restraint outside the passband, two wide coupled opencircuited lines are. Design and validation of miniaturize rat race coupler. But, how do we design a coupledline coupler with a specific coupling coefficient c.
Structure of a branchline coupler the geometry of a branchline coupler is shown in. 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. 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. A schematic of 5 branch line coupler with 10 eplane tjunctions is shown in fig. The device can be used for a single antenna transmitterreceiver system or an iq signal splittercombiner. Implementation details mblcoup implies that coupler is mirror symmetrical relative to horizontal axis see topology. The capability of implementing dualband branchline couplers by means of composite rightlefthanded transmission lines has also been demonstrated in 1921. 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 branch line coupler circuits.
L 3 may provide more feasible design see reference. The method is based on the usage of equivalent subcircuits input reactances of the evenmode and oddmode excitations. However, its out of band characteristic has insucient selectivity for adequate performance as a. It is realized in stripline, showing great agreement with the simulation and design format. As it can be seen from the figure, it has a symmetrical four port. For a 20 dbthree sections edge coupled line directional coupler, constructed as a stripline with ground plane, spacing of b3. Computeraided design and applications of planar branchline coupler circuits.
Examples of magict circuits are the ratrace coupler, the asymmetric tandem coupler, and the parallel coupled line magict. The equivalent model of the branch line coupler are shown in fig. Computeraided design and applications of planar branch. Hybrid 90 simulation agilent advanced system design. Implementation details mblcoup implies that coupler is mirror. Simulation comparison between hfss, cst and wipld for design of dipole. Compact tunable 3 db hybrid and ratrace couplers with.
Branchline coupler calculator online branchline coupler. Ive been trying to design a coupled mircostrip line coupler with only 2 ports. Fourhundred gigahertz broadband multibranch waveguide. The objective of this model is to compute the sparameters and to observe the matching, isolation, and. Ansys hfss software is the industrystandard simulation tool for 3d fullwave. Splitters that yield differential outputs are often called magicts. A ideal singlebox branchline coupler is shown below. The characteristic impedances of slits between the. A branch line coupler is made by two main transmission lines shuntconnected by two secondary branch lines.
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. It employs the finite element method fem, adaptive meshing, and brilliant graphics. The remainder of the power is passed through to the output port pin 2. 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. A novel miniaturized branchline coupler with equivalent.
In this paper, multisection coupler technique is used to improve the performance of the 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. Refer to design assistant in the filter designguide. Based on the similar idea, mondal and chakrabarty presented a branch line coupler, which has the properties of 42% size reduction at 2. The sparameter plots of optimized quadrature hybrid coupler in fig. A branch line coupler quadrature 90 hybrid is a fourport network device with a 90 phase difference between two coupled ports. Based on the similar idea, mondal and chakrabarty presented a branchline coupler, which has the properties of 42% size reduction at 2. A schematic of 5branchline coupler with 10 eplane tjunctions. Heres a clickable index to out material on branchline couplers. The designs use siw parameters of low loss dielectric material, rogers ro 4003 with. Design of microstrip branch line coupler phase shifter in l. 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. Figure 2 presents the design parameters for the microstriptosiw coupler.
Current design at skyworks for 90 degree hybrid coupler. In both 2 and 3, the design is restricted by the open stub area which limits. Design of microstrip branch line coupler phase shifter in. The exact design formulas for three options of the dualband coupler with different location and number of. The concept of implicit space mapping for design optimization was presented. Analysis also includes a shielded enclosure with metal lid 100 mils above the surface of the alumina substrate. Atlanta rf software offers the following cae software for synthesis and analysis of directional. A branchline coupler is made by two main transmission lines shuntconnected by two secondary branch lines. Design and validation of miniaturize rat race coupler based. 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. This kind of coupler is frequently performed in microstrip technology or triplaque and is part. In the scope of this paper, a branchline coupler working at 2. A natural consequence of coupled lines is a quadrature phase response. A schematic diagram of conventional quadrature hybrid or branch line coupler.
Some licensed software are also available to design the high frequency antennas and fabricate as well using pcb fabrication machine. Your design of directional couplers is well enhanced using our rfmicrowave cae software for the most popular designs needed in your rf circuits. 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, simulation and development of wideband directional. The branchline coupler blc is a fundamental component in planar.
This example shows a microstrip branchline coupler on alumina er 9. A lband design of microstrip branch line coupler phase. The geometry of the branchline coupler is shown in fig. Rrc is used for combining the power and also as an equal power splitter between two. Senior design engineer, tubitakbilten, metu campus, inonu bulvar. Alma memo 468 designs of wideband 3db branchline couplers. 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. A threedimensional view of the waveguide structure is illustrated in fig. Computeraided design and applications of planar branchline. You do have ports 4 and 3 reversed from what the books usually use. Coupler and power divider design in awr linkedin slideshare. The coupler is designed on software advanced system design ads. Novel broadband 3db directional coupler design method.
It is one of the worlds leading innovators in high performance analog and mixed signal semiconductors and offers a wide variety of products. Citeseerx document details isaac councill, lee giles, pradeep teregowda. The broadband branchline coupler is designed in stripline technology which has two conductors and a homogeneous. For a more detailed discussion of this device, see. Reflection attenuators are one application of branchline couplers.
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. Based on this model, the performance of the coupler is optimised by hfss software. 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. 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. Design method for quasioptimal multiband branchline couplers. Design of an asymmetric branchline coupler using implicit. In order to find them, we use evenodd mode analysis. Design and simulation of coupledline coupler with different values of coupling efficiency 15 of the couplers can be. A schematic of 5branchline coupler with 10 eplane tjunctions is shown in fig. Couplerline coupling coefficient specification table 2. A schematic of 5 branch line coupler with 10 eplane tjunctions.
Design of a 3 db branch line coupler in hfss youtube. In the analysis of the branchline coupler, we consider the scattering matrix of the coupler. Shortslot hybrid coupler in gap waveguides at 38 ghz. Tryout our demo software to learn more your design of directional couplers is well enhanced using our rf. Pdf microstrip quadrature hybrid branchline coupler cst model. Solutions to design branchline couplers having more. The coupledline couplerif our design rules are followedresults in an ideal directional coupler. Z 0 characteristic impedance of the overall system.
I am trying to plot gain vs frequency plot in hfss. Specifically, the 90 degree hybrid coupler is utilized in the handset infrastructure because it offers lowloss, high isolation, and exceptional phase and amplitude balance. A singlesection branchline coupler was designed for a center frequency of 5 ghz with an equal power split between the i and q ports. To determine the scattering parameters of branch line coupler. To achieve a directional coupler with good restraint outside the passband, two wide coupled opencircuited lines are employed instead of two microstrip line branches. In chapter 1, the need for this new technology is motivated by explaining the. A novel broadband 3db directional coupler design method utilizing hfss and realization are given in this paper. Below we present a lumpedelement quadrature coupler which was optimized to work at 100 mhz. The goal of this paper is to analyze, simulate, and design a microstrip quadrature hybrid coupler phase shifter operating at resonant frequency of 1. 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 book chapter mainly focuses on analytical analysis for the branchline coupler in which this method provides an explicit solution in the coupler design. 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.
Design and simulation of magic tee and ring hybrid coupler. A reducedsize branch line coupler blc was presented in 2 by incorporating a radial stub in the center of each branch. Synthesis and analysis of popular rfmicrowave filters provides confidence and clarity to the filter designs you use the most. First port is named as input port, second and third ports are output ports and the fourth port is the isolated port. 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. In the analysis of the branch line coupler, we consider the scattering matrix of the coupler. A tutorial on using keysight advanced design system ads to design a branch line coupler. Power dividers propagation downloads links site map. Feb 12, 2017 design of a 3 db branch line coupler in hfss. Using zeland software program, s 11 can be calculated as. The geometry of the branch line coupler is shown in fig.
Synthesize and analyze these popular directional couplers with confidence using ars couplers, before you build them. Using hfss software to study the effect of the tumor size on the output signal using transient soultion type. Lange coupler branchline coupler directional coupler 180 deg. This paper reports for magic tee that a signal incident on the difference port splits equally between ports. 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. 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. This is a great question and it takes a little explanation to do it justice. In 3, compact blc design was introduced by adding open stubs at the center of branch lines of the traditional design.
1378 684 222 313 41 425 1064 1339 960 1338 978 693 1061 283 344 992 1207 1396 443 498 332 1494 1007 541 216 506 697 770 49 876 18 537 1131 554 782 200 182 1125 27 535 638