Alaris Antennas presents spiral antennas

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The antenna is designed to use two conductive spiralled arms, extending from the centre outwards.

Alaris Antennas designs and manufactures a range of spiral antennas, which can be customised to suit each client’s requirements.

Spiral antennas belong to the class of frequency-independent antennas, which can be designed to operate over a wide range of frequencies. Polarisation, radiation pattern and impedance of these antennas remain relatively stable over a large bandwidth.

The antenna is designed to use two conductive spiralled arms, extending from the centre outwards. The antenna may be a flat disc, with conductors resembling a pair of loose spirals, or the arms may extend in a three-dimensional shape like a spring. The direction of antenna polarisation depends on the direction of rotation of the spiral.

Possible applications of spiral antennas are wide-band communications, spectrum monitoring, direction finding and signal suppression.

The two types of spiral antennas that are offered by Alaris Antennas are cavity backed and conical spiral antennas.



Cavity backed spiral antennas are inherently circularly polarised with medium gain. An array of spiral antennas can be used to increase the gain. The cavity changes the antenna pattern to a directional shape.

Conical spiral antennas offer higher directionality and gain, which is often required for communications and jamming applications.

Below are the current spiral antenna designs offered by Alaris Antennas. Please click on each product to view it on our Web site.

Product Code

Product Name

Frequency Range

SPRL-A0001

LHCP Cavity Backed Spiral Antenna

1000 – 4000 MHz

SPRL-A0003

LHCP Cavity Backed Spiral Antenna

1000 – 6000 MHz

SPRL-A0007

LHCP Cavity Backed Spiral Antenna

6000 – 18000 MHz

SPRL-A0005

High Power Circular Polarised Antenna

400 – 450 MHz

SPRL-A0008

High Power Circular Polarised Antenna

1000 – 6000 MHz

SPRL-A0018

High Power Circular Polarised Antenna

1000 – 1600 MHz

SPRL-A0020

High Power Circular Polarised Antenna

400 – 2500 MHz

SPRL-A0021

High Power Circular Polarised Antenna

2000 – 6000 MHz

SPRL-A0010

Dual Port Circular Polarised Antenna

1000 – 6000 MHz

For sales enquiries, visit: www.alarisantennas.com (+27) 11 034 5300