[HELP] UHF Transmitter Antenna impedance matching

[surfing]

Practical solution about UHF transmitter

hi there, It's my transmitter illustrated in attached jpg file.
I have some doubts in antenna matching. it's appreciated that anyone can help me.

1. I have no network analyzer in hands for the moment.
2. the freq. of transmitter is 863-864Mhz (wireless phone for Europe market)
so we choose the cheap antenna:whip antenna. it's length is 86mm( may it's better to reduce 10% of it's length? I am not sure)
3. can you tell me the impedance of this antenna? (perhaps it's 35+??j ?)
4. the RF module output's impedance is 50 Ohm
5. so we must add some matching circuit between A and B, which can match the output of module together with antenna. how to adjust this part. could anyone give me some suggestion?

anyway, we want the antenna matchs the RF module to produce the best transmitt effects. if you have some experiences in such practical solution. please give me some advises. thanks
you can email me via the following 2 boxs
surfing@arkon.com.cn
surfingyee@21cn.com

 

[springf2000]

it is easy to determine your impedencd,use the HFSS simulate it,then the result can be trusted,ok?

 

[surfing]

thank springf2000's suggestion. but i have no such simulator software.
1.i want to know approximately the impedance of antenna in the case of my product. after know it, i could manually tune it to 50ohms by adding such as PI network tracking in Smith Chart.

I think my question is clearly and popular, could anyone give me valuable information?
Thanks