High frequency multi-turn loop antenna in cavity
First Claim
1. A compact high frequency loop antenna comprising:
- a conductive surface having a concave cavity formed therein for receiving a magnetic field having a given distribution within the cavity;
current loop means located at least partially in said cavity and including a plurality of conductive loop elements forming a plurality of openings therein, each loop element being located in said cavity as a function of the distribution of the magnetic field distribution in said cavity, wherein at least two loop elements form different angles relative to each other to enhance the magnetic coupling between said current loop means and said conductive surface; and
a first terminal coupled to said conductive loop element and providing electrical connection to a transceiver for transmitting and receiving desired signals.
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Accused Products
Abstract
A compact high frequency multi-turn loop antenna is provided for use on a conductive structure such as the airframe of an airborne vehicle. The antenna employs a plurality of interconnected conductive loops which are magnetically coupled to a conductive structure. One end of the conductive loops is coupled via tuning and impedance matching circuits to a transceiver for transmitting and receiving signals therefrom. The other end of the conductive loops is coupled to ground. When transmitting a signal, the transceiver excites a current on the conductor which induces a magnetic field that excites the conductive structure. Upon receiving a signal, the conductive structure is excited which in turn generates a magnetic field through the plurality of loops and induces a current on the conductor. The antenna may advantageously be mounted within a conductive cavity structure which in turn is connected to the conductive structure.
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Citations
22 Claims
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1. A compact high frequency loop antenna comprising:
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a conductive surface having a concave cavity formed therein for receiving a magnetic field having a given distribution within the cavity; current loop means located at least partially in said cavity and including a plurality of conductive loop elements forming a plurality of openings therein, each loop element being located in said cavity as a function of the distribution of the magnetic field distribution in said cavity, wherein at least two loop elements form different angles relative to each other to enhance the magnetic coupling between said current loop means and said conductive surface; and a first terminal coupled to said conductive loop element and providing electrical connection to a transceiver for transmitting and receiving desired signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A high frequency multi-turn loop antenna for use on a conductive surface such as the airframe of an aircraft for receiving a desired magnetic field having a given distribution, said antenna comprising:
current loop means including a conductor forming a plurality of loops which are located in a cavity provide in said conductive surface, said loops having openings therein and positioned as a function of the distribution of the magnetic field in said cavity and at a preselected angle with respect to each other so that loops provide optimum magnetic coupling with said conductive surface, and wherein at least two of said loops form different angles relative to each other. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A low profile high frequency multi-turn loop antenna system for use on a conductive surface, said antenna-system comprising:
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a conductive concave cavity formed in the conductive surface for receiving a magnetic field having a given distribution; a loop antenna having a conductor forming a plurality of loops having openings therein, said loops being located substantially within said conductive cavity and oriented as a function of the distribution of the magnetic field in said cavity, wherein at least two of the loops form different angles relative to each other so as to form a magnetic coupling between said loops and said conductive surface; and transceiver means electrically coupled to said loop antenna for transmitting and receiving desired signals. - View Dependent Claims (20, 21)
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22. A method for forming a loop antenna system for transmitting and receiving high frequency signals, said method comprising:
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forming a plurality of loops from a conductive loop element; forming a conductive cavity in a conductive surface so that said cavity has a non-conductive side for allowing magnetic fields to penetrate therethrough; mounting the loops in the cavity in said conductive surface so as to form a magnetic coupling between said loops and said conductive surface; arranging said loops according to the distribution of a magnetic field inside the cavity and so that at least two of the loops form different angles relative to each other so as to provide optimum magnetic coupling between said loops and conductive surface via the non-conductive side of the cavity; and coupling a transceiver to said conductive loop element to enable transmission and reception of selected signals.
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Specification