broadband amplifier in ka band

[zeshan102]

hi

i am woking on design of ka band(27~31Ghz) amplifier ,is there any feed through and standoff are available in this frequency range for the bias circuit design.

Regards

 

[zeos]

hi
Tetronix has types of feed through for this frequency range.

Regads.

 

[zeshan102]

i am looking for chip capacitor and inductor for dc block and rf choke.

 

[kleinesmurf69]

hello,

I find it hard to believe you can use chip lumped elements at these frequencies. may I suggest to use microstrip/stripline structures instead.

best regards.

 

[DJ]

If your design is MMIC then for the Gate use a parallel capacitor of about 5pF, then a series resistance of about 50 ohms and then another parallel capacitor of about 0.7pF. A TRL of lamda/4 length from this capacitors bank to the gare. At the Drain use again lamda/4 line then 0.7pF parallel cap and close to that put 5pF.
If your design is MIC. Have a lamda/4 line length from the gate and then a parallel 50 ohms (you can pribt it) in serie and again 5pF. You cn use ATC or Dielectric Lab capsor print OST as a cpcitor.
If you can hold several ohm at the drain use the same bias circuit as the gate but with several ohms instead. If not just don't use any resistor.

 

[djalli]

What transistor are you using?

 

[zeshan102]

my design is MIC based and i am using NE27200 .