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The reason that different value capacitors are used in by-passing or decoupling is to avoid the self resonance and lossy performance that one capacitor may exibit. A .1 uF capacitor may be a good low impedance bypass at 500 kHz, but usually not very effective at 800 MHz. By using two capacitors...
Re: LO-RF isolation
What about RF-LO Isolation in an Direct Conversion radio?
How do you Isolate these port?
I can see you using an Isolator in a discrete component design but how is this
done in an RFIC?
Well an 868MHz antenna is going to be pretty large.
Make sure you use a substrate with a high/lager Dielectric constant.
The "Inverted F" is a little more compact, but I don't know who good it's
performance is compared to a typical Dipole.
Good luck
The REA books are pretty good, especialy the green calculas one.
http://www.amazon.ca/s?ie=UTF8&keywords=Calculus+Problem+Solver+(REA)&search-type=ss&tag=hotg02f8-20&index=blended&dev-t=D2Y5TUCCVJ7DGE&link_code=qs&page=1
Hope this helps.
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