>
>>Jim Thomps>>> Is it possible to get a 1.2uH inductor that's still inductive at
>>> 600MHz ??
>>>
>>> ...Jim Thompson
>>
>>Sure. You do it using a coil wound as a tapered helix, with its point
>>towards the high-frequency side, backed up with SMT coils of increasing
>>inductance. It's done all the time in bias tees--I have one that's flat
>>within about +-1 dB from 20 kHz to 30 GHz.
>>
>>It would be difficult to make an inductor that still looked like 1.2 uH
>>at 600 MHz--it would resonate with 60 fF.
>>
>>Cheers,
>>
>>Phil Hobbs
>
>What I'm trying to implement, cheaply, is a crossover network for a
>coax splitter: corner at 10MHz, impedance 75 Ohms, but "well behaved"
>at 600MHz.
>
>(G-job ;-)
>
> ...Jim Thompson
Do you mean
+-------Cap--------B | | A----------+ | | +-------Ind--------C
or something like that?
The inductor could just be composite. A lot depends on the passband separations; you'd need higher-order networks if they're close.
John