How to calculate parameters for a PCB antenna at 27MHz?

I want to build an FSK TX with center frerq at 27MHz. The only condition is that the TX antenna should be suitable to be on a PCB or a PCB plus a "SAMLL" piece of wire. I work with a Logitec mouse which uses this principle. The antenna is part on the PCB and part as a wire loop (about 10cm). I know how to build the amplifier.

The very question is, does anybody know how to calculate the antenna (size, shape and impedance)? Where could I find info. I searched the web for two days and the only result are schematics showing the aplifier, but nothig is said on how to implement the antenna.

Long life to the one that helps me on this topic!

use HFSS software u can get the simulation results!

Here is some info on 27MHz loop PCB antennas (page 12):
http://www.grandatech.com/ti/TRF7900.pdf
Loop antennas like this can be used for very short distances - practically inside one room - for reasons explained by H-C.
Regards,
IanP

I would look into a ferrite antenna. You can find them in any S5 AM radio you can pick up in a drug store.

You wind some wire around an appropriate ferrite rod--forming an inductance. You then connect the two ends of that wire to a capacitor. Where the L and C resonate, the antenna will work. You couple into the antenna with a second loop of a few turns of wire around the ferrite rod. In practice, the C is usually a variable capacitance that you tune to resonate the antenna at your frequency.

27 MHz is far enough away from the 600 KHz to 1.7 MHz that an AM radio antennas rod works at that you will probably need a different μ ferrite material, and fewer turns of wire.

One benefit of this type of antenna is that is will work in the "far field". For example, it can pick up an AM radio station 1000 miles away, so it is capable of receiving far field signals.

do u have any lect or resources explain tank circuit radiates?

thx alot

There is some theory here:

http://home.att.net/~ray.l.cross/murod_mm/