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Antenna for field measure at 3.5Ghz - RF Cafe Forums

Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views. It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if you would like to post something on RF Cafe's Facebook page, please do.

Below are all of the forum threads, including all the responses to the original posts.


Post subject: Antenna for field measure at 3.5Ghz
Posted: Tue Jul 11, 2006 7:24 am
 
Lieutenant

Joined: Wed Nov 30, 2005 8:22 am
Posts: 2
Hello,
i need to realize some indoor/outdoor measure at 3.5Ghz.
For realize this measure is necessary a nonperturbative, x-y-z axis Rx antenna.
My idea is realize a narrow band measure with spectrum-analyzer, so a large-band probe for EMC measure is not good.
I don't find any antenna with this characteristic.
Build it is not too easy!!
Could anyone help me??
MR.D.
[/list]


 
 
Post subject: Antenna for Field Measure at 3.5G
Posted: Tue Jul 11, 2006 12:40 pm
 
General
User avatar

Joined: Fri Feb 17, 2006 12:07 pm
Posts: 218
Location: London UK
The least perturbing narrow band antenna is probably a quater-wave groundplane or quarterwave sleeve balun type.

The length is about 2.1 cm at 3.5GHz, the horizontal H plane radiation pattern is omni and the E plane pattern is fairly broad. Just strip back 2.1 cm of semi-rigid coax, and add a small ground plane of radial wires to the solid outer at right-angles to the center conductor

Calibrating the gain accurately might be a problem, although there is probably now enough field experience of ground-plane antenna gain that you could find enough references on the web





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