Identification apparatus
AssigneeA.T.L. Agricultural Technology Limited
InventorRobin William Sadler
Life of this patent
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Abstract
A communication system, such as an identification system for use in animal feeding or milking parlors, has a driver (16; 200; 320; 350), which supplies current to an antenna (for example 1; 68; 208; 306; 352). That current causes the antenna to emit power (in the from of a time varying magnetic or electromagnetic field), which energizes a transponder (220) operable to transmit an identification signal (such as an RF signal). The driver and antenna are connected to a parallel inductor, which reduces the total inductance of the load seen by the driver. The antenna may be one of a plurality of antennae, all of which are connected to the same driver. Each antenna is located in a respective stall in a milking or feeding parlors so that the system can identify which animal is in which stall of the parlors at a given time.
Claims16
A communication system comprising a driver connected to a load, which load includes a transmitter means, the driver being operable to supply current to the load thereby to cause the transmitter means to emit power for energising a remote transponder, characterised in that the load includes an inductor connected in parallel with the transmitter means and driver so as to reduce the total inductance of the load, in that the transmitter means comprises a plurality of antennae each of which is situated at a position remote from the driver and is operable, in addition to transmitting said power, to receive an identification signal from a transponder, and in that said inductor is situated adjacent the driver.
A communication system comprising a driver connected to a load, which load includes a transmitter means, the driver being operable to supply current to the load thereby to cause the transmitter means to emit power for energising a remote transponder, characterised in that the load includes an inductor connected in parallel with the transmitter means and driver so as to reduce the total inductance of the load;
- in that the transmitter means comprise a plurality of antennae each of which is situated at a position remote from the driver and is operable, in addition to transmitting said power to receive an identification signal from a transponder, each antenna being a coil antenna, and in that said inductor is situated adjacent the driver.
Dependencies are inferred from the claim text.