PRODUCT SPECIFICATION

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
Dimensions:                                                                       Weight:                                   Environments:                         Material:                                  CBS-24-R or CBS-24-L downloadable pdf file		Width: 24" - Length : 26" - Thick: 5” 15 Lbs Operating: -20°C to +60°C Storage: -40°C to +70°C 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

24" Frequency range - 100 MHz to 1.3 GHz

PDF Printable Brochure