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Hi,
I need some help for my design. I have placed capacitors at the end of my monopole antenna but when i change my dielectric of my coaxial cable to air due to my return loss is very poor, my capacitors cannot be used. Could someone help me please?
I have attached my design.
Thank you
Urgent Help needed.
I have designed a monopole antenna with capacitor. I have placed my capacitor vertically upwards with current flowing down to ground. I have tried to run the simulations in 2 different computers and i get 2 different results for frequency.
Even with the same computer, i...
I have tried to place my capacitor as a plane in HFSS and put it vertically upright. With the current flowing to ground. But i tried simulating this in 3 different system and i get 3 different results. Can tell me why do i have such problem?
Hi,
I am designing a monopole antenna. The image below is my design. I have drawn 2 wires connecting down from my monopole and also 2 plane for the capacitor. I would like to know how am i going to connect the wires to the capacitor?
Please help me as i need help urgently. I need to finish...
Re: Tunable HF antenna
Please help me.. I am rushing for my project and i am stuck. I have found a paper on sleeve antenna with ground wires.
Can someone explain to me what is a λ/4 sperrtopf?
another thing is using HFSS, can i just extend the center of the coaxial cable and treat it as my...
Re: Tunable HF antenna
I am using HFSS for simulation. It is a software given to me to use it.
I was thinking of using lumped elements that can be screwed to the "ground". On the other hand, I do have an idea of placing a board above the ground so that i can place the lumped elements.
Re: Tunable HF antenna
My initial design was just a coax but running the simulation without the lumped components, my results was not that good. Thus i changed my design to be this way. I can try to re-design my antenna but i do not know what kind of lumped materials i can use.
Is there any...
Re: Tunable HF antenna
nope. I understand that discone is a cone at the top but mine is just like the sleeve antenna but i am asked to connect wires down from the top to the dielectric lump elements for tuning purpose.
Re: Tunable HF antenna
The monopole antenna will be at the top. But at the top it is not a cone therefore i did not think that it is a discone.
Please help me as i am stuck for my project. Thanks.
Re: Tunable HF antenna
Sorry.. I am new at this i would appreciate if you could explain a little to me. I have attached my idea of the monopole antenna.
If i am not wrong it is the monopole element that i would like to be tuned.
dielectric hf antenna
Hi,
Currently i am designing a simple monopole antenna. My design is something similar to a sleeve antenna. I would like to seek help in knowing what are the dielectric materials that i can use for tuning the monopole antenna.
Thanks for your help.
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