Communications: radio wave antennas – Antennas – High frequency type loops
Patent
1998-01-14
2000-05-09
Le, Hoanganh
Communications: radio wave antennas
Antennas
High frequency type loops
343741, 343788, 343856, 343867, H01Q 700
Patent
active
060610301
ABSTRACT:
Communication systems requiring a user to wear a headset or body pack preferably include small aerials that use ferrite cores to achieve transmission efficiency. Driving such aerials typically requires the use of a transformer to obtain the strongest possible magnetic field where only a limited supply voltage is available. The limited supply voltage is addressed by combining a step-up transformer and an aerial array on a single permeable core. The transformer includes a primary winding and a secondary winding that are wound along the circumference of the circular cross-section of a toroidal core. The aerial array includes a transmit winding and a receive winding. The transmit winding is wound along the diameter of the toroidal core and the receive winding is wound along the circumference of the toroidal core. In one embodiment, the receive winding is divided into two matching halves. The voltages induced in each half of the receive winding are amplified and summed such that voltages induced by the local transmit winding are canceled while those voltages induced from a transmit winding in a second, distant unit are summed. In another embodiment, a plurality of transmit windings are wound on the core for producing fluxes which are summed in the core and generate a single magnetic induction field.
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Le Hoang-anh
Phan Tho
Plantronics Inc.
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