Dk is a very important property for microwave pcb design. Specifically, the 90 degree hybrid coupler is utilized in the handset infrastructure because it offers lowloss, high isolation, and exceptional phase and amplitude balance. Students registered in ece451 can get free access to ansys hf package from the university of illinois software webstore. To open a help topic about a specific hfss dialog box, open the dialog box, and then press f1. To determine if the results are as expected, you compare hfsss sparameter calculations at each septum position on a 2d xy plot. The length of the line must be long enough such that only one propagation mode exists on the reference plane of the port. A lumped port excitation will be used for the cpw feed. The port and lumped port boundary conditions can help simplify the modeling of wave electromagnetics problems. Does anyone have an idea about the wave port or lumped port in hfss,which. Feb, 2003 the port need to be large enough to reduce edgeeffect. The device must be connected by a section of transmission line or waveguide supporting. So, i am defining a sheet which is assigned as the lumped port, and then after a short distance which is modeled by a cylinder, i define another sheet to assign 5 kohms to it as the interal impedance of. Pdf high frequency structure simulator hfss tutorial. Your guide to lumped ports in the rf module comsol blog.
Lumped gap source ports 4 example of structure where gap source ports can be useful. Click the microsoft start button, select programs, and select the ansoft, hfss 10. Chandrasekhar, please send me that powerpoint file. The lumped port can be used to specify an effective impedance between two conductive boundaries within the modeling domain.
Another use of the lumped port condition is to model a small electrical element such as a resistor, capacitor, or inductor bonded onto a microwave circuit. Walter frei explains what these boundary conditions mean and when they should be used. How can i connect the waveguide port for cpw coplanar feed line for a patch antenna using cst software. I konw for a microstrip line, i can draw the 2d port rectangle that touchs the signal with one edge and the opposite edge touch the reference ground plane. Use waveport, not lumped portif excitation is external for gud results. Gap source port has other boundary conditions on sides that dont touch metal. To obtain the field patterns, intrinsic impedance and wavelength for the first 4 modes. The device must be connected by a section of transmission line or waveguide supporting traveling waves. The demand for a smaller 90degree hybrid coupler with a broader bandwidth is. To address the excitation and termination of a coplanar waveguide cpw or the common or differential mode on two parallel microstrip lines, use the multielement uniform type coplanar waveguides. Bi, i have done extensive simulation on hfss, both ansoft and agilent, and the cpw problem has always frustrated me, but found that i could generally coax the.
Left and right edges of port should touch left and right ground planes of cpw. This port configures the cpw model with a pair of subfeatures called. It shows the electric and magnetic vector fields at 10ghz as well as. Yes, you will want to define a port at each end of the conductor the ports will be defined between conductor and ground. I want to define a lumped port in hfss driven terminal solution type to model a voltage source with an internal resistance of 5 kohms. I have a cpw transmission line that i am tweaking the dimensions of to try and get 50 ohm characteristic impedance. Rectangular waveguide hfss r objective getting started with hfss a tutorial using hfss, simulate an airfilled wr90 waveguide shown above. Lumped gap source ports 3 a port with multiple conductors per port would take all coupling into. Ansoft hfss 3d boundary manager go back contents index sources port wave ports lumped gap sources considerations when defining ports incident wave voltage and current sources magnetic bias port by default, the interface between all 3d objects and the background is a perfect e boundary through which no energy may enter or exit. For transmission line problems, such as microstrip lines or cpw, in theory, the size of the.
The ansoft high frequency structure simulator hfss is a fullwave electromagnetic em software package for calculating the electromagnetic behavior of a 3d structure. Waveports also feature deembedding to postprocess sparameters to remove effects due to artificial tls used to create connections or adding the effects of the length of tl lines not physically modeled. If your solution type is driventerminal, you may use edit sources to terminate one of the ports with a matched resistance value you will need to toggle terminal excitation type to total voltage in the edit sources window first. Fundamental principles, concepts, and use slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising.
To address the excitation and termination of a coplanar waveguide cpw or the common or differential mode on two parallel microstrip lines, use the multielement uniform type. Rs microwave box resonance resonance due to the enclosure appears as spurious. The boundary selection of the coaxial lumped port in a 2d axisymmetric model. Set up and run a sonnet em simulation project of a coplanar waveguide cpw transmission line including the port designations for differential signaling. Materials used in pcb technology generally have dk from 2 to 10 dk is dimensionless. In some practical radiation system, where the semiconductor device has a cpw output terminal, a cpw fed antennasmith and williams 1992abed2008 is usually required to form a smooth integration with the device. Basic electromagnetic field quantities and, for open. I want to know if the lumped port height and width effects the impedance of the structure. Follow the installation guide to install the software on your pc. Simulation of cpw in hfss circuit design electrical.
Ansys hfss is an industry standard tool for simulating 3d fullwave electromagnetic fields. How assign lumped port in hfss for stripline hi,everybodybecause the pcb line i will simulate located internally, so i can not use the wave port of hfss. Does anyone have an idea about the wave port or lumped port in hfss,which should be used especially for microstrip patch antenna in uwb range i. Ultrawideband gcpwmsgcpw driven electrode for low cost and. Copper lumped port excitation create a lumped port and excite it. Aug 07, 2017 this is an animation from a simulation of a coplanar waveguide cpw done in ansys high frequency structural solver hfss. Hfss assumes that each wave port you define is connected to a semiinfinitely long waveguide that has the same crosssection and material properties as the port. Filter design using ansoft hfss university of waterloo. Silist how assign lumped port in hfss for stripline. Lumped port reduced height lumped port narrow l can be reduced by moving the ground plane up towards the track, shortening the port. Rs microwave 12 ports in em simulators in 3d em solver wave port internal port formed by a rectangle between trace and ground known as lumped port or gap port courtesy. Lumped ports are used to excite or terminate passive circuits and. Coplanar waveguide port size is determined by inner dimensions of waveguide.
A 50ohm acp probe is going to transfer high frequency modulation up to 30ghz to a coplanar waveguide cpw which is connected to a short cavity laser with a bondwire of 25um diameter. How to set lumped port and wave port in hfss youtube. You should now be able to plot the sparameters for both the port driving the cpw and the new waveport connected to the antenna. If you continue browsing the site, you agree to the use of cookies on this website. Learn how to use the port and lumped port boundary conditions in comsol multiphysics for modeling wave electromagnetics problems. To determine if the results are as expected, you compare hfsss sparameter calculations at each septum position on a. I read in hfss help that lumped port has some inductance in range of nh. How ii should not include the lumped ports impedance in the total result. International journal of engineering trends and technology. How do you design a port in hfss for cpw feed slot antennas.
Characteristic port impedances and propagation constants. Ports and lumped ports for wave electromagnetics problems. Roke presentation title 2 using hfss successfully at 77ghz data sheets give you the dielectric constant and the loss tangent. Bi, i have done extensive simulation on hfss, both ansoft and agilent, and the cpw problem has always frustrated me, but found that i could generally coax the simulator into doing. Hfss waveport simulation for cpw transmission line z0 mismatch so i cant quite figure out what seems to be the problem. Analysis must include first three modes te10, te20, te01 3.
Adam nykoruk mccaughan submitted to the department of electrical engineering and computer science on may 21, 2010 in partial ful llment of the requirements for the degree of master of engineering in electrical engineering and computer science abstract over the last decade, quantum information experiments with trapped ions have demon. Wave port represents the surface through which a signal enters or exits the geometry. This video demonstrates the use of several modeling tricks in ansys hfss to create a microstrip design and excite it with a lumped port. Hfss waveport simulation for cpw transmission line z0. The imaginary component of complex permittivity is df dissipation factor.
The software also includes postp rocessing commands for anal yzing the electromagnetic behavior of a structure in more detail. This is an animation from a simulation of a coplanar waveguide cpw done in ansys high frequency structural solver hfss. Intuitive pcb design entry for hfss chips, packages, channels, modules, designer layouts simulated with hfss automated boundary and port setups finite dielectrics and ground supported wave and lumped gap port single ended and differential vertical and horizontal. How assign lumped port in hfss for stripline sipi exchange. I am using lumped port to measure the impedance of a rod buried in soil in high frequneices. Cpw structures has been carried out with the hfss software. Hi, 1,draw one rectangle which contact to the edge of the top and bottom plane 2,draw one rectangle which has the. Basic electromagnetic field quantities and, for open boundary problems, radiated near and far fields. A lumped port can be defined on any 2d object that has edges. Intuitive pcb design entry for hfss chips, packages, channels, modules, designer layouts simulated with hfss automated boundary and port setups finite dielectrics and ground supported wave and lumped gap port single ended and differential vertical and horizontal coaxial, cpw and grounded cpw. However, modaltonodal software is needed to make use of this. Mar 09, 2015 an example of a userdefined lumped port geometry. To access online help from the hfss user interface, do one of the following.
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