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Antenna Question

I read an article that mentioned circularized polar antenna's. Can someone tell me where(what type of application)they would be used and also give a Cisco part number? Thanks...

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Green

Re: Antenna Question

Circular polarization (Right-Hand Circular Polorization - RHCP and Left-Hand Circular Polorization - LHCP ) is primarily used in satellite communication.

In the trip through the various layers of the atmosphere/magnetosphere a typical horizontal or vertical polorized signal can/will change planes (and if you think about it, what's horizontal or vertical relative to an object in the sky?).

So, to negate / reduce the effect of the atmosphere, the signal is sent using a circular polorization. For a given antenna element count, a CP antenna will be about 3db less gain, but will tend to have less distortion and fading, compared to a similar antenna with linear polorization.

Uses are things like GPS and Direct Satellite broadcasting.

I don't think Cisco has any CP antennas. There is not much advantage to using them for terrestrial communications (at least not point-to-point / point-to-multipoint fixed-station comms).

Good Luck

Scott

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