Using VNA for RF impedance and phase measurement

Hi everyone:
Recently , I begin a project for RF Impedance Measurement,
Specially for antenna impedance. I plan use a wisdon resistance bridge to
measure gain&phase data.
analog device inc's ic ad8302 look like a good choose for this design,
who can give me some advice?

Do you have a VNA? A single sweep does everything!

Shooting for both amplitude and phase, I guess you need a VNA, or vector network analyzer. This neat artcle would maybe fit your bill: www.circuitcellar.com/PSOC2002/winners/3.htm.
If you only want the amplitued, why not take a look at:
www.geocities.com/hagtronics/vhf_na/index.html or
www.page.sannet.ne.jp/kenjia/analyzer.html

At least you should get a fair idea how to build your own measuring instrument.

Good Luck and keep us posted on your progress

/WD

Try this article on DIY VNA

ADS or Microwave office is fine.

How to use VNA to measure differential CKT impedence ?