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How did you design the antenna ? If you did it on CST you probably gave waveguide excitation from the ports and your ports are probably Z=50 ohms. When you design antenna , you look at S11 measurements of the antenna.Generally you want your S11 to be below -10dB in band. -10 dB S11 means your VSWR=1.92 and Reflection Coefficient=0.316 . This al
hey there, I built in hfss a rectangular wave guide and two pins that should feed him. I wish that the waveguide will only let TE20 mode to propogate. How can i make it? which kind of ports should i use? thanks a lot!
Hello Dears I would like to insert an external AC current on my design. for example: if I have a dielectric substrate backed with a metal plate and on the top there is a microstrip TL, and I want to feed the TL with an external AC current instead of the waveguide port. Does anybody has an experience with such a design? Thanks in advance.
How to give plasmonic feed in nano antenna by waveguide port?
Hi. This is a basic question, when feeding a waveguide with a coaxial cable, using the inner cable pin to feed the waveguide (without a conector, its feeding directly), but the shield of the cable does not touch the waveguide, will the antenna still work or does affect a lot? Also, is (...)
for designing a novel CPW feed fractal antenna for UWB,, they have chosen coplanar waveguide feed... is there any possibility of using probe feed??? what are all the advantages and disadvantages of using this probe feed for designing a novel probe feed fractal antenna for UWB???? rectify my (...)
hiii , i have to excite te11 and te21 mode in circular waveguide using coax feed . how to get the length and diameter of coax conductor protruding inside the circular wg. it will be changed in order to meet the waveguide impedence which is much greater than 50 ohm coax line impedence. similarly for te21 modes 4 coax excita
Hello, I am facing this error : "Port number 1 and 2 have overlapping areas in mesh representation. Consider to decrease the port dimension or to refine the mesh distribution." I am trying to simulate this design in CST which uses two coaxial feeds for the lower patch and the upper patch. The coordinates for the feed location have to be same,
I had made a double coaxial slot antenna at 915 MHz in CST microwave studio, the problem is with the feed as it is a cylindrical antenna the problem is with the feed. I had given it waveguide feed but the results are not coming to the cylinderical antenna feed and where should be the ground (...)
I want to simulate the plate as a reflector (by placing horn in front of plate) Assign a waveport excitation the the waveguide feed of the horn. Place the horn and the pate in a vacuum, where the edges of the vacuum box are at least a quarter wavelength away from the horn and plate. Assign a radiation boundary
I would look at a double ridge to waveguide transition. the coax probe attaches to the ridge. can get multi-octave bandwidth
assume we want to feed waveguide or horn for wideband usage. For narrowband distance from probe to backshort is about quarterwave. What can be used in wideband case. Probe is microstrip wideband monopole on pcb. Generally the distance can be the quarter-wave of a center wavelength. Specifically, this distance m
Dear all, I am designing a Coplanar waveguide feed for my printed LPDA antenna. I need some help about design parameter and calculation that need to be followed for CPW design on patch antenna. The feedline width of the LPDA is 1mm. can CPW be implemented on this feed width? Regards
Ok let's try: 1) So, my first question is which feeding port is most suitable for this type of design.Discrete port or waveguide port.: It depends I think, if you have just your antenna, waveguide excitation would be correct if you use for example some microstrip or cpw as feed. In your case, I recommend a discrete
hello I want to simulate the aperture coupled micro-strip antenna, and i have the parameters of this antenna, just i want to know how to design waveguide port, i tried to use 3*wf X mt+5*hp:wf is width of feed line,and hp: high of substrate of patch, but for microstrip antenna,you know in this antenna, the feed line and patch are on the (...)
place grounded areas around your lines. use vias going to ground. it will look like a coplanar waveguide. I am assuming you are using a microstrip topology.
Try a quarter-wave plate inserted in the feed waveguide diagonal. Use a thin Teflon plate or a similar dielectric. I doubt it could work over the extremely wide bandwidth, though. Why you simply do not tilt the horns by 45 degrees?
driven modal for waveguide type problems.
hi. i want to design a conical horn with variable polarization characteristic. changing in polarization taken with a motor that rotate a plane that taked place incide horn please help me . thank you You do not define what polarization you need. The feed waveguide defines the polarization.
Hi, I have designed a quad ridged horn antenna. Everything is fine, gain, sparameters, etc. However, E-plane pattern of each port has shifted 1-2 degrees. It is because of the asymmetry of quad ridged waveguide feed section. This is caused by the phase delay due to other prob's enterance. When I use the connector having small external radius, the
yeah it is possible, but even if out of band, will probably not have too much loss. more likely your oscillator stops oscillating with the load u have. Try a short length of straight waveguide between the two to see if it works then.
Hi, I am hoping to use CST to get the impedance at one end of an asymmetric microstrip as accurate as possible. The cross section of my microstrip is as shown in attachment. I am really confused what dimension of waveguide port should be to get an objective and accurate line impedance there. Should it still be symmetric, can it go beyond the edg
I want to design an x-band corrugated waveguide feed at the central frequency of 10 GHz. If the ridge radius is the same as smooth waveguide radius (2*r1 = 23.83 mm) then based on the balanced condition, the slot radius of aperture (r0) will be: Sm(x1, x0) = 0 x1 = k*r1, x0 = k*r0 (r1 = internal radius of wavegide r0 = radius of slot) (...)
Hi, I need to simulate at CST preformence of reflector (dish)antenna (that have the dimension of d=12cm,f=8cm,freq=34.3GHz) and compare to the specsification of the real one reflector antenna I am using the the tamplate from :macros\constract\online\reflector dish but in this tamplate there isn't a feeding point (coaxial line port or waveg
hey i am wrking with corrugated horn with circular waveguide as a feed..i wanted to excite the waveguide linearly....pls help me out...
Hi guys, I am designing a monopole with two cables attached to it. The ground plane is on top of the substrate and i'm hoping to feed the monopole by a coaxial feed from the bottom of the substrate. I have tried 'picking the face' of the bottom of the monopole and creating a waveguide port, however it comes up with the following (...)
I tried to design a DRA antenna in CST MWS whose file is attached along with.But I am not getting desired S parameters which may be because of ambiguity in applying ports to the antenna.I am applying a waveguide port at the feed line which is feeding the slot. I am supposed to generate TE mode in that waveguide (...)
I know in HFSS it would be a wave port. HFSS has the terms "lumped port" and "wave port" and I suspect the waveguide port is what you want in CST. A horn is going to be connected to a waveguide, so if CST has a waveguide port, I'd be very surprised if that was not the one to use. As for getting S11, I don't know, but this sounds the sort (...)
Recently I am reading on microwave waveguides, especially the case a feed waveguide coupling to another waveguide with short end (a cavity) via an aperture. (Collin, "Foundations for Microwave Engineering", Chapter 7.6). I have a question and I will really appreciate if anyone answers it and helps me understand more. The (...)
Anybody please tell me how to reduce vswr of a waveguide in hfss design. I am designing a horn feed. If anybody know please help...
A "monopole" stuck into a waveguide (assuming along the centerline to excite a TE10 mode) will have a certain efficiency related to the impedance match over your operating bandwith and the conductor and dielectric losses of the actual feed. So, on average, assume 0.95 of the power gets thru (assuming a well matched launch). Then the (...)
Hi all I want to simulate a rectangular microstrip patch antenna with coplanar waveguide feed at 3.4 G Hz what should be my design dimensions Er=4.4 height of substrate=1.6,Fr4 like lenth n width of patch ike lenth n width of ground gap between microstrip line and ground ground dimensions what are the formulas or calculator to compute these
hi all can anyone expalin me general structure of coplanar waveguide fed microstrip patch antenna I am confused any good reference paper what is position of ground,patch microstrip feed kartik:roll:
I viewed the figure fast a small notice, I didn't see integration line for the lumped port also you can try the waveguide port instead finally, did you simulate with a lossy or a lossless FR4 Substrate ?
hi to find the resonant frequency of half wavelength resonator u have to use the coplanar waveguide calculator like TXline coplanar calculator or line calculator ads or any other calculators. it will give u the correct result vidhya sivaraj
dipoles, helical, patch, loop,spiral, waveguide horn, leaky waveguide, and so on do not have ground planes.
hi ! I'm designing an adapter , and my problem is feeding waveguide by coax. Can anyone help me to calculate the coordinates of coax feed , and length of coax feed that enter to the waveguide ? I want parametric coordinates , in order to calculate them for each frequency.
See transmission line theory, and Coplanar waveguide As for your second question, that's pretty vague. If you feed power into the matched input of an antenna, it'll generally radiate, regardless of
hi all I have designes coaxial cable fed,microstrip line fed and aperture c oupled microstrip patch antennas give me hints to design coplanar wavwguide feed microstrip antenna basically i require steps to design caplanar waveguide feed in msa:-) regards kartik
Hiii everyone,i am doing a project on slot antennas using CST software but i don't know how to feed the waveguide.could anyone please tell me the design and simulation procedure for slotted waveguide antenna.thamq in advance... REGARDS PICSA !!!!
Hello all, I am trying to design a transition between a 50Ω coax line and a rectangular waveguide with unusual dimension: ~200mm width and ~2mm height (a very wide and short waveguide) The purpose is to excite the TE10 mode with good matching and wide bandwidth. I'll be glad to hear your ideas of how to feed such a structure and (...)
antenna is basically a waveguide which just guides the signal in particular direction. when it is applied to the feed point of the antenna then the signal travels through the antenna waveguide and depending upon its type it follows its direction (omnidirective/directional). there is also a particular style in which the wave is super (...)
hi i think no one can said how we can achieve the lowest VSWR but if u mean that u need VSWR less than 2 the length of waveguide should be between 24-26mm
Hello, 1. Use Driven Model with a waveguide port 2. I think the stanard values are ok 3. You can plot the J-field under the "Field Overlays"
I'm trying to learn how to setup circular polarization in CST 2009 Microwave Studio for a plane wave. Assume a very simple dipole atten. Ground plane with feed (waveguide port over this feed), dielectric slab, dipole and then waveguide port 2 in front of the attn. How could I send a plane wave circularly polarized from port (...)
I'm trying to simulate the antenna described in the attached document, but I can't make it work as predicted. I am not sure about how to feed this antenna. I tried lumped port, as well as waveguide port, but the results don't agree with the documentation. Can somebody help me?
First separate the coax feed from the horn. Model them separately at least at first. We assume you have set up the design boundaries, air box, etc. You excite the horn by selecting the waveguide end, and placing there a excitation port. At this stage you can find out all you need for the horn. I think the port radiates both ways, but that do
Hi everyone i designed a microstrip balun in cst MWS but how can I draw waveguide port for more accuracy. I read waveguide port section in help but in my design ground area so closed to feed line please help
I gather that you want to use the Balanis formulation to calculate the directivity of your horn. a and b are the inside dimensions of the waveguide feed of your horn. It would be easier to remove the transition to measure the wg. You will probably find that it matches one of the standard sizes and have a 2:1 ratio. It looks like it might be S
Slot as in waveguide slot ? Then, look at coax to waveguide transition first.