Recent content by bhawkins

for off the shelf lab components--adapters, cables, attenuators, etc sm electronics www.smelectronicsllc.com

while i haven't used that exact equipment, i'd expect an overall accuracy of +/- 0.1db bob hawkins www.smelectronicsllc.com

4 ghz coaxial attenuators can be had for $25 or so, see www.smelectronics.us . sma most common, bnc, tnc, n available also

10mhz is the lower limit rf feeds into a 50 ohm circuit, though there may possible be a dc return to ground; but its 50ohms from 10mhz-18ghz max loss: 0.5db thanks! bob

thanks! 200volts is a design spec. there may be 150-160v bias on one end, though this seems unlikely to me. it also seems unlikely the other port will be grounded. but 200volts its what i have to design to

thanks! one of my concerns is with the voltage rating of the smaller caps used for the high frequencies. high freq caps tend to be low voltage, like 50 volts; but i need 200 to be safe

but be careful about using nickel underplate if you're worried about pim

yes, atc & dielectric labs both make "hybrid" parts; 2 caps in parallel; a large one for the low freq's, & a small cap for the high frequencies. the drawback is that the small caps have too low a voltage rating. i prototyped with the dielectric labs co8 with 2400pf; its only rated to 50 volts...

I need a dc block with low loss from 0.01-18ghz, on an alumina substrate. i need it to handle 200v. it seems to me a single capacitor, .5microfarad or so, would work; but i cant find any parts rated tp 200 volts & 18ghz. any ideas? thanks,

thanks dave! application is a coaxial attenuator; we plan to mount a surface mount chip attenuator on an alumina substrate. i didnt know nanowave or micrometrics were in the business; i'll go check them out. thanks! bob

i think i'm going to give up make my own. who's a good supplier of chip attenuators, 2 watts, 0-20ghz? 1db, 6db, etc thanks,