Kaltman Creations LLC has introduced the IWxCPA Invisible Waves antenna, which incorporates directional “circular polarization” (CP) technology for both receiving and transmitting pro audio wireless applications.
The IWxCPA is intended to reduce interference and drop outs, 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 mics 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 new 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.
According to Kaltman Creations LLC president Mark Kaltman, “The IWxCPA antenna strengthens one of the weaker links in the RF chain - the transmitter to receiver link. Interestingly, in the pro-audio wireless world there is little consideration given to the profound effect polarization can have on the performance of our wireless gear.
“Just like in the audio world, where you always consider the weakest link in the audio chain, the same considerations should be given to your RF signal chain.”
The antenna design is unique in many ways, the most obvious being its low-visibility flat panel sign. Unlike paddle and helical antennas that point into the performance area and, therefore, expose their large sides to the audience, the theatre black IWxCPA panel faces the performance area leaving only a 1.3 inch edge visible to the audience.
One reason that CP antennas are not very common in the pro audio wireless related environment is cost. Many true CP antennas (not to be confused with cross polarization antennas) can run close to $1,000 each and in some cases are large and fragile.
The new IWxCPA is sold in a 2-antenna package for $499 and is guaranteed. It is passive with a 60-degree beamwidth, and the pattern is circular polarized in the 470 MHz to 960 MHz range. For use with in-ear-monitor transmitters, the IWxCPA has plenty of room to spare with a maximum input power rating of 3 watts.
The 10 inch x 10 inch x 1.3 inch, 2.5-pound antenna includes a swivel mic stand mounting capability (optional truss mount available) and are painted theatre black with a 50-ohm low-loss BNC connection.
Kaltman Creations LLC