One query is from: damodhar vanjarapu: Hi, In the step-5 below,u have created a air box. I'm not able to create the same thing. Can u please help me. In ur video it is not clear. ------------------------------------------------------- Ans: If you see at 10:00:00 time instant, I have copied already existing Air1 and rename it by ''radiation" box and modified the dimensions. # Actually in waveguide, as it is closed structure there is no need of radiation boundary, you may simulate it without that.
Hi Voon 183, Thanks for your question. Let me know your design first. As waveguide is designed by metal with air filled. There is no option of substrate. Please feel free to elaborate your point. Thanks.
Hi, i am currently design an implantable antenna. so my design will required using two substrate which is substrate and superstrate where the feed and ground is connected through the subtrate
How to calculate the thickness (th) of the rectangle wall? I am going to simulate rectangular waveguide a type of WR-12 , where a is 3.1 mm and b is 1.55 mm. Also, how to determine the length L for my rectangle?
Thumbrule is greater than 5 times of skin depth for choosing the thickness of the waveguide. For example at 10 GHz, skin depth 2 um (say), min thickness will be 10 um.
hello, really nice video for start up,i want to design a wave guide for heating of paper ,the waves are actually of the normal house hold microwave just 2.45GHz ,i feel like a kind of pyramid wave guide will let the distribution of the heating nice,can you help me on how i can do the design ?
Actually not required, no radiation we are expecting, by the way, simply air inner portion of wg, by default surrounded are pec...we can design waveguide that way too.
You can see port field for each cases. To see the field over the waveguide for higher order mode, you have to suppress others mode. That is the another way of design. One option may be you have to feed power in such that it suppress TE10 mode, then you can see TE20 mode. I hope that I answered your ques. Any doubt you may contact me.
how to suppress other modes. how much power and how to feed power in our design. I have another question, that is, can we design dielectric resonator cavity in hfss and view the field distribution for the dielectric resonator?
1. Mode suppression includes another design complexity, for you I can suggest: you change the solution frequency and see the field pattern by selecting inner of the w/g for the particular frequency. let say, for X band for TE20 mode appears after 14GHz. Set solution frequency 14 Ghz and see the field pattern inside the w/g. 2. Power feed: In HFSS you need not to feed power in the design. You define the port thats all. 3. Dielectric resonator: Yes. It is FULL wave simulator, so you can easily design dielectric resonator cavity in hfss and view the field distribution for the dielectric resonator. Thanks for your Ques.
This is Scattering parameter like Z, Y parameter. For high frequency voltage current may not possible to measure, reflection and transmission have to consider thats why S parameter is useful
It should be 5 times of skin depth. Typically .1mm or more than the value also ok. Thanks. Please Subscribe the channel to reach 1000 Subscriber family.
sir thank you very much. sir , if i will give the wave port to one side then can i see the radiation pattern means, how the wave is coming from other side (other side i will not give any wave port ) sir , i also want how to give coaxial feed to circular wave guide. could you please upload sir..
Thanks Mr. Dilli for your question. It is very interesting question. Yes you can place one port for any design to see the radiation pattern. Remember that your design must have enough energy for radiation. Means S11 below -10 dB with good gain. Another way you can check radiation in two port design also. See the S11 below -10 dB and S21 also more than -10 dB, means it has enough radiation. Radiation= 1-(S11*S11-S21*S21). Actually used in Leaky wave antenna. For your information, when you will go to design then you must check radiation by checking the formula. Sometimes, without consent antenna can be designed. Next, time I will try coaxial feed to circular wave guide. Subscribe.
Thank you so much. I am finally could able to see the fields
Most Welcome...
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One query is from: damodhar vanjarapu:
Hi,
In the step-5 below,u have created a air box. I'm not able to create the same thing. Can u please help me. In ur video it is not clear.
-------------------------------------------------------
Ans:
If you see at 10:00:00 time instant,
I have copied already existing Air1 and rename it by ''radiation" box and modified the dimensions.
# Actually in waveguide, as it is closed structure there is no need of radiation boundary, you may simulate it without that.
Gracias! excelente video, la amo
This is indeed very good. Please upload some more videos on other topics if possible.
+Arup Ray
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can u do a video or give brief guide line to design a cavity and simulate it at higher order mode
Sure, I will try.
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Thanks for uploading video with detailed info... Please upload more videos of antenna designing especially spiral, helix and dish antenna
Thanks....
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sir, please upload video of how to design parabolic, dish and horn antenna.
Hi, will you show how to design using double layer of substrate in a rectangular waveguide? Thanks...
Hi Voon 183,
Thanks for your question.
Let me know your design first. As waveguide is designed by metal with air filled. There is no option of substrate.
Please feel free to elaborate your point.
Thanks.
Hi, i am currently design an implantable antenna. so my design will required using two substrate which is substrate and superstrate where the feed and ground is connected through the subtrate
At some points you are getting positive values for S(2,1) in dB (at 6.57GHz). The values of S parameter are not supposed to be positive right?
You are correct, may be no pf pass have to increase.
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How to calculate the thickness (th) of the rectangle wall?
I am going to simulate rectangular waveguide a type of WR-12 , where a is 3.1 mm and b is 1.55 mm. Also, how to determine the length L for my rectangle?
Thumbrule is greater than 5 times of skin depth for choosing the thickness of the waveguide. For example at 10 GHz, skin depth 2 um (say), min thickness will be 10 um.
this video is very useful. Sir how to excite higher order modes in a waveguide.
can u do a video or give brief guide line to design a cavity and simulate it at higher order mode
You cant excite higher order mode but can check the higher order field from fundamental.
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thank you so much... very greatful
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why should we assign excitation in 2 sides?
Because for input and output power.
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thanks!very good video.And I have a question.how to excite a desired mode like TE/TM20 in the waveguide.
yes sir.... please tell this...how to do this?
There is no as such way.
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can u do this for rectangular cavity resonator
Will try.
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What should be dimensions for an HMSIW antenna to resonate at 2.45GHz...need answer urgently please...
It is exactly half width, center should be open magnetic wall.
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Why k0 is 2*3.142*freq/(3e8)?
thx
Propagation constant. K=2*pi/lamda, where lamda=Vp/freq;
For free space, K=K_0, Vp=c, light velocity;
Means, K_0=2*pi/lamda_0=2*pi*freq/Vp=2*pi*freq/c;
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How did you subtracted both boxes.. i m not able to select both of the boxes at the same time
You are removing air from metal, so in boolean subtraction you must have this metal in first box and air in second boc and then apply
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Is there a way to export those field plot data for further processing?Like plot them in matlab
No. Still I didn't get such options till date.
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Excellent video.
Can you please assist me in antenna simulation for UHF band in HFSS??
Hi, alex nnn
Yeh sure. You may ask your problem here also.
Soon I will upload Antenna simulation in HFSS. Stay connected.
Thanks.
hello, really nice video for start up,i want to design a wave guide for heating of paper ,the waves are actually of the normal house hold microwave just 2.45GHz ,i feel like a kind of pyramid wave guide will let the distribution of the heating nice,can you help me on how i can do the design ?
Thanks.
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Why is radiation box need outside Waveguide?
Actually not required, no radiation we are expecting, by the way, simply air inner portion of wg, by default surrounded are pec...we can design waveguide that way too.
@@joydebmandal2440 thanks
Can we select the values of A and B randomly?
No, this width A depends cutoff frequency.
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how to plot resonance frequency in hfss please make a video please please
This is eigen mode simulation. Please try in IE mode.
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excellent. thank a lot.
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im unable to assign wave port to Air1, can anyone please tell what to do
Usually, after selecting face, port assignment is FOLLOWED.
how can i contact with you mam
how to know the (or) calculate the the A ad B values for the given frequencies .could you please any one can suggest me ,please
Usually fixed. For WR90 a and b values were as in the video
check this link
www.everythingrf.com/tech-resources/waveguides-sizes
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ort refinement, process hf3d error: Port 1 is assigned to an internal face. Only allowed with lumped ports.. I get this error in wave port
May be dimensions are not putted correctly. Use variable or zoom the structure where overlapping is happening.
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how to plot fields for mode 2 and mode 3. When I am trying to plot field for mode2, mode1 field is appearing. please help me..
You can see port field for each cases.
To see the field over the waveguide for higher order mode, you have to suppress others mode. That is the another way of design.
One option may be you have to feed power in such that it suppress TE10 mode, then you can see TE20 mode.
I hope that I answered your ques. Any doubt you may contact me.
how to suppress other modes. how much power and how to feed power in our design. I have another question, that is, can we design dielectric resonator cavity in hfss and view the field distribution for the dielectric resonator?
1. Mode suppression includes another design complexity, for you I can suggest: you change the solution frequency and see the field pattern by selecting inner of the w/g for the particular frequency.
let say, for X band for TE20 mode appears after 14GHz. Set solution frequency 14 Ghz and see the field pattern inside the w/g.
2. Power feed:
In HFSS you need not to feed power in the design. You define the port thats all.
3. Dielectric resonator:
Yes. It is FULL wave simulator, so you can easily design dielectric resonator cavity in hfss and view the field distribution for the dielectric resonator.
Thanks for your Ques.
thank you so much sir. please provide me your mail id sir, I have some doubts regarding my final project year project
latestbengalisong@gmail.com
what is s parameter?
This is Scattering parameter like Z, Y parameter. For high frequency voltage current may not possible to measure, reflection and transmission have to consider thats why S parameter is useful
th value for metal box
I want to know value of th in metal box
It should be 5 times of skin depth. Typically .1mm or more than the value also ok.
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bro, i need some from u..could u please help ?
i will mail u my problem...!!
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sir thank you very much.
sir , if i will give the wave port to one side then can i see the radiation pattern means, how the wave is coming from other side (other side i will not give any wave port )
sir , i also want how to give coaxial feed to circular wave guide. could you please upload sir..
Thanks Mr. Dilli for your question. It is very interesting question.
Yes you can place one port for any design to see the radiation pattern. Remember that your design must have enough energy for radiation. Means S11 below -10 dB with good gain. Another way you can check radiation in two port design also. See the S11 below -10 dB and S21 also more than -10 dB, means it has enough radiation. Radiation= 1-(S11*S11-S21*S21). Actually used in Leaky wave antenna.
For your information, when you will go to design then you must check radiation by checking the formula. Sometimes, without consent antenna can be designed.
Next, time I will try coaxial feed to circular wave guide.
Subscribe.
thank you very much sir.... sir please upload coaxial feed to circular wave guide as early as possible
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