It's hard (nearly impossible) to do that on the pcb, because of the wavelength. The best receiver performance you will have with a antenne with the length of lambda/2 or lambda/4. For your case a example: 88MHz = lambda/2 ~ 1.7m :-?
Many manufactors of RF IC's have some application notes with good background descriptions. As example www.RFM.com ... and many other also ... :wink:
you just need to use a 5/8 wave stub on pcb load it up and couple it to a tight coil pick up system from one sid on pcb to another
{this is a good stsem for tuning also}
use a gdo and tune it up
you can add loading coils
as for software
i agree
there is none to be had
but im shure it exists as ive seen many examples of pcb coils but no software
Thank you for all, but i'll like to know how portable radio works, I think that the headphones's wire is used as an antenna. I don,t know how the connection is made.
Yes, you can use headphone's wire as a primitive antenna. Connection into receiver is made trough a small capacitor (~10-100pF) which has small resistance for HF and don't give the pass for audio. Antenna is made from wire's shielding. It's better than no antenna..
Better is to use lambda/4 wire antenna electrically extended by coil if you want to have it "small"
How do you electrically extend antenna ? I would like to know some theory on that subject. Where to look for it. Does anybody have any ebook on that subject ?