Size of Coaxial Wave port

Hi All,

I got some problems on size of coaxial wave port.
Since i am simulated planar antenna which i am using wave port to be touched with my feed point of antenna, although the result of simulation shows me a good size, however, i wondered how large the coaxial wave port should i use. 1mm diameter internal core? 2mm diameter in vaccum ground shielding? or as long as i set it as 50ohm for all freq no matter how small we make it into HFSS if and only if it can touch the antenna feed?

I would like to have some advice on it.

Best Regards,
Le

I guess you are feeding from the backside through the ground plane. For accurate results you should put the actual dimensions of your feed, and the actual dielectric. If it is a standard connector you can find the data needed easily.

You'll need the actual dimensions of your coax cable.
i.e. the inner diameter (conductor), outer diameter (dialectric), and type of
cable (rigid or flexible).

go to : www.timesmicrowave.com
search for "coax cable design equations".

with the formulas there make sure the dimensions you have
gives you the appropriate impedance.

(make sure the simulation gives the same impedance).

Good luck,
p.