topic Re: Antenna Question in Wireless https://community.cisco.com/t5/wireless/antenna-question/m-p/604598#M101929 <HTML><HEAD></HEAD><BODY><P>Circular polarization (Right-Hand Circular Polorization - RHCP and Left-Hand Circular Polorization - LHCP ) is primarily used in satellite communication. </P><P></P><P>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?).</P><P></P><P>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. </P><P></P><P>Uses are things like GPS and Direct Satellite broadcasting. </P><P></P><P>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).</P><P></P><P>Good Luck</P><P></P><P>Scott</P><P></P></BODY></HTML> Thu, 08 Jun 2006 12:48:58 GMT scottmac 2006-06-08T12:48:58Z Antenna Question https://community.cisco.com/t5/wireless/antenna-question/m-p/604597#M101928 <P>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...</P> Sun, 04 Jul 2021 19:17:13 GMT https://community.cisco.com/t5/wireless/antenna-question/m-p/604597#M101928 rx33328 2021-07-04T19:17:13Z Re: Antenna Question https://community.cisco.com/t5/wireless/antenna-question/m-p/604598#M101929 <HTML><HEAD></HEAD><BODY><P>Circular polarization (Right-Hand Circular Polorization - RHCP and Left-Hand Circular Polorization - LHCP ) is primarily used in satellite communication. </P><P></P><P>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?).</P><P></P><P>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. </P><P></P><P>Uses are things like GPS and Direct Satellite broadcasting. </P><P></P><P>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).</P><P></P><P>Good Luck</P><P></P><P>Scott</P><P></P></BODY></HTML> Thu, 08 Jun 2006 12:48:58 GMT https://community.cisco.com/t5/wireless/antenna-question/m-p/604598#M101929 scottmac 2006-06-08T12:48:58Z