EMBEDDED AND COVERT ANTENNAS

Wireless devices require antennas which are highly efficient but do not detract from the usefulness or appearance of the product. Seavey Engineering designs special antennas for integration into such equipment. Many successful designs have been done for wireless telephones, wireless laptop computers, RFID equipment and satellite DARS radio applications.

These antennas find use also in covert applications where the antenna’s appearance must not reflect its purpose. Such covert antennas generally have multiple functions.

A variety of antenna types are available. For example, dipoles, patch elements of many configurations, F-style and L-style circuits and tuned notches are in our design library.

The ultimate goal for many embedded antenna designs is to incorporate the radiating element onto an existing printed circuit board or as part of a plated plastic enclosure or cover. This results in a solution in which the antenna has zero cost.

The problem then is to characterize the radiation properties and validate that the system requirements have been met. Seavey Engineering has EM modeling codes to model such effects. With its talented engineering staff, the company solves embedded antenna requirements in close consultation with its customer. The following are typical examples of covert and embedded antenna designs.

Model 9268-800 - DARS Automobile Antenna Fabricated from high quality alumina, this 1.88 inch diameter patch antenna operates in the 2.31 - 2.36 GHz frequency range. It is designed to be built into the roofs of sedans as original equipment and employed as a receiving antenna for Digital Audio Radio Service usage. Model 9268-800

Model 9543-800 - Wireless Telephone "Flip" Diversity Antenna Located in the "flip" lid of a wireless telephone, this F-style element has sufficient polarization isolation and spatial separation to function as a polarization/space diversity antenna. It operates in the 935 - 940 MHz frequency range. Model 9543-800

Model 9509-800 - Wireless Telephone Diversity Antenna The F-type radiating element is located within the plastic base enclosure. It is a thin stamped metal shape and is soldered to the main RF circuit board in two places. Two plastic push-type fasteners secure it. Operating in the 485 - 495 MHz frequency range, this very low-cost antenna is orthogonally polarized to the main antenna and provides for polarization/space diversity reception. Model 9509-800

Model 9378-800 - Mirror-Mount Four-Function Antenna Used as a multi-function covert antenna, this "elevated feed" whip antenna serves four purposes. It can receive Loran C navigation signals, operate as a standard cellular antenna, receive GPS signals and also receive L-band SATCOM signals. A special feeding arrangement is used. Two RF cables are used with external diplexer filters. The entire unit is 31 inches tall and comes with a standard base spring and a trunk lid mount. It cannot be distinguished from an ordinary automotive cellular antenna. Model 9378-800 Model 9737-800