NE32584C at 8 GHz

[benkm]

Hi,
I like to optimize the NE32584C for minimum noise, found on this board for 8 GHz:
https://www.rf-microwave.com/en/nbp/nmp/10-ghz-amplifier-24ghz-doubler/su-02/

The microstrips I don't get. Are the stubs marked with a star capacitors?
The track-width is also not clear to me. Two tracks come together in the 50 Ohm. So the track should be 100 Ohm, but it is much wider.
Hopefully someone can help me with these basic questions.
Thanks in advance.

[zach05]

The microstrips I don't get. Are the stubs marked with a star capacitors?
search "tuning stubs". In your case, these very short stubs more act like capacitor at operating frequency.

The track-width is also not clear to me. Two tracks come together in the 50 Ohm. So the track should be 100 Ohm, but it is much wider.
these not necessary to be 100 ohm. This is a satellite TV receiver down convertor, perhaps X or K band, at this frequency range better use the transmission line calculator.

www.microwaves101.com will answer most your questions