High Pass Filtering Antenna

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#1 21670293 02 Nov 2013 11:44

Ryan Daugherty Ryan Daugherty

Anonymous

Post #1
21670293 02 Nov 2013 11:44

I am trying to find an ACCURATE antenna with a built in HPF to block below 100 MHz. I am using it to test for Partial Discharge in stators. Does anybody have any suggestions?
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#2 21670294 02 Nov 2013 13:10

DAVID CUTHBERT DAVID CUTHBERT

Anonymous

Post #2
21670294 02 Nov 2013 13:10

What frequency range do you want the antenna to cover?
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#3 21670295 06 Nov 2013 11:14

Ryan Daugherty Ryan Daugherty

Anonymous

Post #3
21670295 06 Nov 2013 11:14

We are looking to cover 0 to roughly 150Mhz.. The signals we are looking to pick up range from 40Mhz to just under 100Mhz and we want those to be blocked by the HPF. The noise must be eliminated to show the true signal which starts at 100Mhz.
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#4 21670296 06 Nov 2013 11:28

DAVID CUTHBERT DAVID CUTHBERT

Anonymous

Post #4
21670296 06 Nov 2013 11:28

If you're using an EMC Receiver or a Spectrum Analyzer it will filter out the unwanted frequencies. But if you additional filtering - a preselector - a suitable filter can be purchased or built. PAR Electronics can build you a filter.

http://www.parelectronics.com/index.php

Depending on how much attenuation you need a simple dipole antenna alone may work. A 125 MHz dipole is down 13 dB at 100 MHz with attenuation increasing below 100 MHz.
#5 21670297 07 Nov 2013 06:55

Ryan Daugherty Ryan Daugherty

Anonymous

Post #5
21670297 07 Nov 2013 06:55

Thank you for the information. I will check out the PAR site. I appreciate it!
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