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Coaxial feed of a microstrip antenna

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antenna_beginner

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Hello,I am trying to make a coaxial feed to my circular patch antenna.
As shown in the photos bellow i have created to metal cilinders one inside the other with dielectric cilinder spacing.
The dimention are such that the inner pin touches the patch and the outer coating touches the ground plane.
After ward with boolean operation i made the pin and the patch a single object,the outer coating and the ground a sigle object,
made a waveguide port and ran the simulation.

but its not working an showing really low directivity,if you could help me with a step by step manual which i could follow.
(i have tried to follow both youtube video manuals)
Thanks.

Capture1.JPGCapture2.JPGCapture3.JPGCapture4.JPG
 

How many mesh cells between top and bottom metals of PCB? Maybe none? Then your connector sees short.
 

From the posted pictures is hard to understand where the mistake is.
Try to follow the example below, and you will understand how to design a coaxial feed. Indications might not be exactly the same if you use a different version of the simulator.

**broken link removed**
 

Hi antenna_beginner, I am a beginner too. I am working on HFSS not CST, but i believe the design should be same even with different softwares. In Coaxial/Probe feeding technique we subtract or remove a circular slot from ground plane and create 3 cylinders(probe, pin, coax) and a circle(waveport) but i am sure about making patch+inner cylinder and ground+outer cylinder as one object each.

Capture.JPG Capture1.JPG

Follow below clip on youtube to understand better:
https://youtu.be/ntPqoZ2NI90
 

qurratulayn said:
Hi antenna_beginner, I am a beginner too. I am working on HFSS not CST, but i believe the design should be same even with different softwares. In Coaxial/Probe feeding technique we subtract or remove a circular slot from ground plane and create 3 cylinders(probe, pin, coax) and a circle(waveport) but i am sure about making patch+inner cylinder and ground+outer cylinder as one object each.

View attachment 136240 View attachment 136241

Follow below clip on youtube to understand better:
https://youtu.be/ntPqoZ2NI90
Click to expand...

sorry i am *not sure about making patch+inner cylinder and ground+outer cylinder as single object each
 
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