24 inch Cavity Backed Spiral Antennas built by Antenna Authority, Inc

Cavity Backed Spiral Antenna

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:

Ordering Information
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

Cost $1950

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

12" version available
Refurbished 24" available

Please contact Ferrel if you have specific needs that are not covered here - we may already be working on what you need.

Antenna Authority, Inc.
Ferrel Bentley
Phone 770-577-7969
Cell 770-331-0436
Fax 770-577-7180
E-Mail


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