Antenna Authority, Inc
Phone (770) 577-7969





Product Code --- CBS-24
Cavity Backed Spiral
downloadable pdf file

This self-complementary Archimedean spiral antenna is a frequency independent antenna - a lightweight medium-gain array designed to receive a circularly polarized wave.  The Archimedes spirals typically cover a 10 to 1 frequency range while maintaining essentially constant impedance over the band.  The antennas have been designed for broad-beam, broadband applications and provide a compact, lightweight configuration that can be easily flush mounted. They are widely used in systems whose primary functions are surveillance, direction finding and telemetry.  These antennas are mounted in a square structure and made on FR4 .063 fiberglass with a flat front face that can be easily mounted in the side of a vehicle.   They are terminated and loaded with absorbing foam.  The low end frequency is a function of the size and depth of the cavity, while the upper frequency is limited by the detail of the center structure.  They have greater than a 10 dB F/B ratio before mounting into a vehicle. 

Electrical Specifications
Frequency Coverage:   100 MHz 1.9 GHz @ Gain -15 to +4 dBi 
350 MHz - 1.9 GHz @ Gain 0 to +4 dBi 
Azimuths Coverage:   60 to 90 beam width typical for 3 DB down
Squint   Less than 8 degrees
S11 Return loss   Greater than 10 dB
Polarization:   Circular (left or right)
Impedance:     50 ohms nominal 
Connectors   BNC

Mechanical Specifications      





CBS-24-R or CBS-24-L
downloadable pdf file

  Width: 24" - Length : 26" - Thick: 5

15 Lbs

Operating: -20C to +60C Storage: -40C to +70C Humidity:95%

Aluminum, FR-4, Foam
Stable rugged construction, Compact light weight, Works in harsh conditions


Specifications subject to change without notice
Printed in U.S.A. Copyright 6/1/2008

12" version available
Refurbished 24" available

Gain and Pattern Plots


Several plots at individual frequencies are included in the pdf file

Pictures of Typical Construction

Antennas are available with either square cavities for individual use, or with angled sides for mounting in a circular array.

24" Frequency range - 100 MHz to 1.3 GHz

PDF Printable Brochure

Antenna Authority offers a wide assortment of directional, wideband antennas and other equipment used for radio direction finding and Geo location. We are experts in covert antennas, vehicles and their operation. We are also ready to design new products to meet your specific needs.

Antenna Authority, Inc.                Ferrel Bentley - E-Mail
3381 W. County Line Road
Douglasville, Ga. 30135-1145
(770) 577-7969
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