RE: NEC-LIST: Passive Intermodulation in antennas

Zvi,

I am not aware of any detailed literature specific to PIM. At PCS
frequencies (1.85-1.99 GHz) it is a requirement for the PIM response
(3rd and 5th order) to be no higher than -100 dBm when two 20 watt
tones are input to the antenna.

I have designed numerous antennas using printed circuit antennas (A
Novel Tapered Slot PCS Antenna Array and Model, Microwave Journal, vol
42 no 1, pp 90-100, January 1999). To achieve such levels (-100
dBm)for a production run try to use non-zinc copper. Indepth tests
were performed with a Taconic laminate that had both zinc and non-zinc
copper. The non-zinc copper achieved a much improved PIM response.
Zinc is typically added to the copper to achieve a better peel
strength.

Ron Marino

-----Original Message-----
From: zvi frank

Has anyone information on Passive Intermodulation in antennas? What
sort of PIM value can one expect for two signals of 10 Watts? How does
one minimise PIM? Especially in Printed antennas? Does the solder
joint contribute?
Received on Mon Sep 18 2000 - 21:59:53 EDT