Method and apparatus for creating an EH antenna

• US 20030107524A1
• Filed: 11/22/2002
• Published: 06/12/2003
• Est. Priority Date: 05/23/2000
• Status: Active Grant

• Current Assignee: EH Antenna Systems, LLC
• Original Assignee: Robert T. Hart
• Inventors: Hart, Robert T.
• Granted Patent: US 6,864,849 B2
• Time in Patent Office: Days
• US Class Current: 343/860
• CPC Class Codes: H01Q 21/24 Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction circularly polarised patch antennas H01Q9/0428; circularly polarised horns H01Q13/0241; cross-polarised horns H01Q13/0258; polarisation converters H01Q15/242; cross-polarised rear feeds H01Q19/136; crossed polarisation dual antenna H01Q25/001
• CPC Class Codes: H01Q 21/29 Combinations of different interacting antenna units for giving a desired directional characteristic H01Q25/00 takes precedence

Abstract

An antenna system for transmitting and receiving, in association with a radio device that develops an H-field and an E-field corresponding to a radio frequency power signal having a voltage and a current, the voltage having a phase relationship to the current. The antenna system includes a Hertz-type radiating element. A phasing and matching circuit is electrically coupled between the Hertz-type radiating element and the radio device. The phasing and matching circuit adjusts the phase relationship between the voltage and the current of the radio frequency power signal so that the H-field and the E-field are in nominal time phase. This enhances the performance of all of the antenna parameters in addition to allowing reduction in size.

Claims

1. An antenna system for transmitting and receiving, in association with a radio device having an H-field and an E-field corresponding to a radio frequency power signal having a voltage and a current, the voltage having a phase relationship to the current, the antenna system comprising:

a. a Hertz-type radiating element; and

b. a phasing and matching circuit, electrically coupled to the Hertz-type radiating element and to the radio device, that adjusts the phase relationship between the voltage and the current of the radio frequency power signal so that the H-field and the E-field are in nominal time phase.

2. The antenna system of claim 1, wherein the Hertz-type radiating element comprises a dipole conductor.

3. The antenna system of claim 1, wherein the Hertz-type radiating element comprises a loop antenna.

4. The antenna system of claim 1, wherein the phasing and matching circuit comprises at least one L-type phasing network.

5. The antenna system of claim 1, wherein the phasing and matching circuit comprises at least one T-type phasing network.

6. The antenna system of claim 1, wherein the phasing and matching circuit includes at least one balun transformer.

7. An antenna system for transmitting and receiving, in association with a radio device, an E-field and an H-field corresponding to a radio frequency power signal having a current and a voltage at a radio frequency, the current and the voltage each having a phase, the antenna system comprising:

a. a first radiating element comprising a conductive material;

b. a second radiating element comprising a conductive material, the second radiating element spaced apart from and in alignment with the first radiating element; and

c. a phasing and matching network, in electrical communication with the first radiating element, the second radiating element and the radio device, that aligns the relative phase between the current and the voltage of the radio frequency power signal so that the H-field is nominally in time phase with the E-field, the phasing and matching network including;

i. a first inductor that electrically couples the first radiating element to a first node;

ii. a capacitor that electrically couples a second terminal of the radio device to the first node; and

iii. a second inductor that electrically couples the first node to the first radiating element.

8. An antenna system for transmitting and receiving, in association with a radio device, an E-field and an H-field corresponding to a radio frequency power signal having a current and a voltage at a radio frequency, the current and the voltage each having a phase, the antenna system comprising:

a. a first radiating element comprising a conductive material;

b. a second radiating element comprising a conductive material, the second radiating element spaced apart from and in alignment with the first radiating element, the first radiating element and the second radiating element connected to a matching network that causes the antenna to be resonant;

c. a balun transformer, having an output;

d. a first L-type network having an input and an output, the input being electrically coupled to the output of the balun transformer; and

e. a second L-type network having an input and an output, the input being electrically coupled to the output of the first L-type network, the output of the second L-type network being electrically coupled to the matching network, the L-type network configured so that the first radiating element and the second radiating element are capable of generating an E-field and an H-field, wherein the E-field is in nominal time phase with the H-field.

9. A loop antenna system, comprising:

a. a loop-shaped conductor having a first end and a spaced-apart second end, a gap being defined between the first end and the second end;

b. a capacitor electrically coupling the first end to the second end;

c. a shunt that is electrically coupled to a first portion of the loop-shaped conductor; and

d. a T-type network that is electrically coupled to the shunt, the T-type network configured so that the loop-shaped conductor is capable of generating an E-field and an H-field, wherein the E-field is in nominal time phase with the H-field.