Direction Finding Antennas and Accuracy Part 3: The Art of designing DF Antennas by Johan Fuhri

In the previous two blog posts we discussed some of the effects that could influence the sensitivity of a DF antenna system.  These were mostly related to the environment, and often manifests in a DF measurement as noise or interference which reduces the ability of the DF system to accurately estimate the angle of arrival….

Direction Finding Antennas and Accuracy Part 2: Characterization of DF antennas

By Johan Fuhri, Product Owner In the previous blog post we considered some of the ways in which we can express the performance of an DF antenna, and we noted that simply stating the ‘accuracy’ of a DF antenna is not quite that simple.  We also noted that there are various algorithms that can be…

Direction Finding Antennas and Accuracy

By Johan Fuhri, Product Owner Part 1: Accuracy and Sensitivity It is sometimes said that: “If you can’t convince them, confuse them!”.  Nowhere is this more apparent than the minefield which is antenna datasheets and brochures. Direction finding antennas are meant to be instrumental in accurately determining the direction of an incoming signal, that much…

An Introduction to Radio Direction Finding

By Eugene Botha and Kalinka Faul Humans do audio direction finding to a remarkable precision of less than two degrees.  Shortly after the development of radio transmitters and receivers, radio direction finding (RDF or just DF) evolved for much the same reasons as human audio direction finding: firstly, for the location of possible threats and…

High-Gain Omni Antennas in Mobile Applications

By Johan Fuhri Antenna Principles High-Gain Omni-directional antennas are used in situations where the direction of the receiving antenna is not static or known.  A typical situation is where antennas are mounted on a mobile platform like a vehicle or vessel. In any communication system, the quality and throughput that can be attained through a…

Spacing Considerations of Multiple LPDAs on a Mast

Multiple LPDA Antennas Written by Johan Fuhri Introduction One of the questions we often get asked at Alaris Antennas, is the question of spacing between multiple LPDA antennas on the same mast. Often, this question is related to situations where the space on the mast is limited (mobile or tactical application) and where high-power transmitters…

Expecting the Unexpected: High Power Transmit Antennas on Vehicles

High Power Transmit Antennas on Vehicles Written by Johan Fuhri Introduction Many of the Alaris Antennas products are used in vehicle-based high power transmit systems, a typical application being the protection of convoys or VIP transport vehicles against remotely triggered improvised explosive devices (IED)s.  Since the performance of the antenna will directly influence the effectivity…