Southwest Antennas has released two new antennas to our bifilar product line, covering popular operational frequency ranges in the S and C Bands.

Bifilar antennas have several benefits owing to the helical design of the antenna elements:

  • Circular polarization
    • Ideal for communication between aircraft and ground stations, as the aircraft can turn and bank without creating a polarization mismatch between the ground station and aircraft. This can occur with two linearly polarized antennas if they are rotated and their polarizations are no longer in the same plane. Circular polarized antennas can also communicate with linear polarized antennas, with a polarization mismatch loss of -3 dB.
    • Circular polarization is less susceptible to disruption by atmospheric layers or inclement weather conditions.
  • Continuous overhead coverage, no “keyhole” gap – unlike dipole antennas which have an elevation radiation pattern that looks like a donut with a hole in the middle (directly above the antenna), bifilar antennas offer complete overhead coverage without a keyhole gap. This makes them useful for close-in communication with vehicles such as airplanes, helicopters, and UAVs.

The new bifilar part numbers include:

Part #: 1032-034 - Omni Bifilar Antenna, RHCP, 4.4 - 5.9 GHz, 3.75 dBic, Ultra-Flex Sealed Spring Base, Type-N(m) RF Connector

Part #: 1032-035 - Omni Bifilar Antenna, LHCP, 2.3 - 2.5 GHz, 4.8 dBic, Type-N(m) RF Connector

New bifilar antennas, left: Part #: 1032-034, right: Part #: 1032-035