Antenna's circular polarization improves reception for pro-audio wireless applications

September 25, 2012 // By Julien Happich
Guaranteed to improve reception for wireless microphones and IEM systems, Kaltman Creations LLC has just introduced the IWxCPA antenna, under the Invisible Waves product banner.

The antenna is not like traditional paddle or rod antennas commonly used with wireless microphone receivers and pro-audio antenna distribution systems. The IWxCPA incorporates innovative directional, “circular polarization” (CP) technology for both receiving and transmitting pro-audio wireless applications. Kaltman Creations guarantees that this antenna will reduce interference, reduce drop outs, help eliminate 'swishing’ noise artifacts, improve RF signal to noise, and enhance reception of signals propagated through and around objects.

Traditional paddle and rod antennas used for wireless microphones are either horizontally or vertically polarized (usually vertically, as a mic is usually vertically oriented). When a microphone transmitting antenna changes its orientation in reference to the receiving antenna (as wireless microphones and belt pack transmitters always do) the phase relationship changes. Also, as a transmitter moves behind objects or the RF reflects off of surfaces, the phase orientation can change. This out of phase or non-polarized condition results in reduced signal level at the receiver and leaves the transmission susceptible to interference.

The IWxCPA antenna uses advanced circular polarization technology which produces a ‘drop-out free’ transmitter and receiver combination that is never out of phase. This technology, along with the antenna’s directional attributes, helps to guarantee as reliable of an RF signal link as possible.

The IWxCPA antennas are sold in a 2-antenna package, they are passive with a 60 degree beam-width and the pattern is circular polarized in the 470MHz to 960MHz range. For use with in-ear-monitor transmitters, IWxCPA has plenty of room to spare with a maximum input power rating of 3 W. The 25.4- x 25.5- x 3.3-cm antennas include a swivel mic stand mounting capability (optional truss mount available) and are painted theatre black with a 50 Ohm low-loss BNC connection.