Davis Derby RFID antennas

Davis Derby manufactures a range of radio frequency identification systems using passive battery-less radio transponders. These transponders are detected by an antenna connected to a Davis Derby Rapid 2000 RFID reader unit. This data sheet describes the various antennas which can be provided.

Versions

There are several versions of antenna, including pole-mounted types, road loops and wall mounted types. In addition, special antennas are available suitable for use in hazardous areas where there may be a risk of igniting flammable gases. Hazardous area antennas are certified EEx m for groups I, IIA and IIB applications.

Antenna Description

All versions of Davis Derby RFID antennas are extremely rugged and weatherproof. They are designed to operate at distances of up to 5 metres from the associated reader unit. However this distance can be increased to 120 metres by fitting a long tail remote tuning unit between the reader and the antenna which is normally installed adjacent to the antenna.

Details of the Antennas

Roadside Antennas

The pole-mounted roadside antenna comprises a steel tubular pole complete with a GRP moulded assembly containing the antenna winding and two optional light emitting diodes which glow to indicate that the system is functioning. The roadside antenna can be supplied with either a straight or a cranked pole as shown. The antenna can also be supplied with alternative mouldings as shown below:

Type	Height	Width	Read Range
DO1	570mm	194mm	0.5 metre
DO3	1014mm	500mm	1.2 metres

Wall Mounted Antennas

The wall-mounted antennas are similar to the pole mounted antennas but are supplied with back straps to enable wall mounting.

Road Loop Antennas

A range of road loop antennas is available using a high grade of cable designed for sinking into the road surface. For optimum performance, it is important that the road loop antenna is at least 25cm above any metal reinforcing rods that may be present beneath the surface of the road.

There are several standard sizes of road loop antenna which give different ranges in terms of read range and the maximum speed of vehicles which can be detected:

1 x 1.5 metres	2 x 1.5 metres	3 x 1.5 metres
3 x 2 metres	4 x 3 metres

Special Applications

There are several other antenna styles available to suit individual applications, for example we can mount the Rapid 2000 reader unit on the pole on roadside antennas.

Ordering Details

Ordering details for the standard range of antennas are given below:

Code Number	Description	Comment
63 000 059	DO3 Roadside Antenna	Specify pole when ordering
60 220 001	Straight Pole Assembly	Designed to be used with roadside antenna 63 000 059
60 220 002	Cranked Pole Assembly	Designed to be used with roadside antenna 63 000 059
63 000 065	DO1 Wall Antenna (Grey)	570mm high 194mm wide
63 000 066	DO3 Wall Antenna (Grey)	1014mm high 500mm wide
63 000 067	DO1 (half inductance - Grey)	Two antennas must be used connected in series
		Two antennas must be used connected in series
X1 002 880	Road Loop Cable	Sold per metre

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