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TEM alternate - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues. Below are all of the old forum threads, including all the responses to the original posts.

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 Post subject: TEM alternate
Posted: Thu Sep 29, 2005 10:53 am 
I saw an interesting question on another forum (won't mention since probably against policy) that I'd like to pose here.

"As an alternate to a TEM cell, we're exploring the idea of using a waveguide-below-cutoff as a means of creating a controlled environment for receiver sensitivity measurements. The receiver is within cellphone-sized package and contains a loop antenna. The receive frequency is roughly 900 MHz.

The thought is to construct a simple tubular rectangular metal structure with height and width dimensions appropriate to prevent waveguide propagation, supposedly providing a steep attenuation characteristic to an incident field at 900 MHz. One end of the tube would be open and allow placement of the receiver in a tightly controlled position within the tube. The other end of the tube would be closed off by a metal plate containing a panel-mount coaxial connector attached by cable to a signal generator.

The thought is to terminate the other end of the connector with some sort of a load appropriate to the generator (50 ohm wirewound resistor?) creating a field within the tube that would rapidly decay.

The generator level, length of the tube, and position of the receiver within the tube would be experimentally determined (using a known good receiver) to be appropriate for threshold testing of subsequent receivers.

Does the concept have merit? Any comments/suggestions would be most welcome."




Posted  11/12/2012

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