Efficient electrically small loop antenna with a planar base element
First Claim
1. A communication transceiver comprising,an electrical circuit mounted on a circuit board for operation at a nation frequency,an electrically small loop antenna including,a radiation device including,a conductive planar base element extending in a base plane,a conductive loop extending from a first end to a second end, said tint end of the conductive loop for connection to said base element at a first location and said second end of the conductive loop for connection to said base element at a second location spaced from said first location,a matching network for matching the impedance of the radiation device to the impedance of the electrical circuit, said matching network connecting the second end of the conductive loop to the base element at the second location whereby radiation current is conducted through the base element and the conductive loop,connector means having first and second conductors for connecting to the electrical circuit, one of said conductors connected to said base element and the other of said conductors connected to the matching network whereby a connector current is conducted between the antenna and the electrical circuit,battery means for powering the electrical circuit,a housing including,means for engaging and locating the circuit board having the electrical circuit at a first level,means for engaging and locating the battery at a second level parallel to the first level,means for engaging and locating the base element of the radiation device at a third level parallel to the first level whereby the base element and the battery are positioned between the conductive loop of the radiation device and the electrical circuit to shield the electrical circuit from the conductive loop of the radiation device.
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Accused Products
Abstract
An efficient electrically small loop antenna includes a radiation device, an impedance matching network, and a connector that interfaces to associated electronic circuitry. The radiation device includes a conductive planar base element extending in a base plane and a conductive loop connected to the planar base element. The loop connects to the base element so that the electrical current for the antenna flows through both the conductive loop and the planar base element. The impedance matching network matches the radiation device to the associated electronic circuitry. The matching network is integrated into the planar base and is connected to both the conductive loop and the base element so that the electric current supplied to the antenna is conducted through both the base element and the conductive loop.
41 Citations
32 Claims
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1. A communication transceiver comprising,
an electrical circuit mounted on a circuit board for operation at a nation frequency, an electrically small loop antenna including, a radiation device including, a conductive planar base element extending in a base plane, a conductive loop extending from a first end to a second end, said tint end of the conductive loop for connection to said base element at a first location and said second end of the conductive loop for connection to said base element at a second location spaced from said first location, a matching network for matching the impedance of the radiation device to the impedance of the electrical circuit, said matching network connecting the second end of the conductive loop to the base element at the second location whereby radiation current is conducted through the base element and the conductive loop, connector means having first and second conductors for connecting to the electrical circuit, one of said conductors connected to said base element and the other of said conductors connected to the matching network whereby a connector current is conducted between the antenna and the electrical circuit, battery means for powering the electrical circuit, a housing including, means for engaging and locating the circuit board having the electrical circuit at a first level, means for engaging and locating the battery at a second level parallel to the first level, means for engaging and locating the base element of the radiation device at a third level parallel to the first level whereby the base element and the battery are positioned between the conductive loop of the radiation device and the electrical circuit to shield the electrical circuit from the conductive loop of the radiation device.
Specification