High efficiency, high power antenna system

• US 6,784,847 B2
• Filed: 09/10/2002
• Issued: 08/31/2004
• Est. Priority Date: 09/11/2001
• Status: Active Grant

• Current Assignee: Thales SA
• Original Assignee: Thales SA
• Inventors: Francis, Michel, Ngo Bui Hung, Frédéric
• Primary Examiner(s): CHEN, SHIH CHAO
• Application Number:
  US10/065,015
• Publication Number:
  US 20030071760A1
• Time in Patent Office: 721 Days
• Field of Search: 343/711, 343/712, 343/713, 343/715, 343/726, 343/728, 343/745, 343/748, 343/750
• US Class Current: 343/745
• CPC Class Codes: H01Q 1/246 specially adapted for base stations
• CPC Class Codes: H01Q 1/3275 mounted on a horizontal surface of the vehicle, e.g. on roof, hood, trunk
• CPC Class Codes: H01Q 21/12 Parallel arrangements of substantially straight elongated conductive units travelling-wave antennas comprising transmission line loaded with transverse elements H01Q11/02; Yagi antennas H01Q19/30

Abstract

Antenna system composed of (N+1) virtually identical radiating structures with N greater than or equal to 1, said (N+1) structures being arranged parallel to each other and each radiating structure being connected to a power supply and impedance matching device. Use for frequency ranges between 1.5 to 30 MHz.

Claims

1. An antenna system composed of (N+1) virtually identical radiating structures with N greater than or equal to 1, said (N+1) structures arranged parallel to each other, each radiating structure is connected to a power supply and impedance matching device wherein it comprises at least a processor equipped with control logic Cm adapted to tune the “

master”

radiating structure and vary at least one of the tuning parameters so that they converge towards the values leading to tuning and logic Cs for transferring the parameters corresponding to the tuning of the “

master”

radiating structure to the “

slave”

radiating structure(s).

2. The antenna system according to claim 1, wherein the power supply devices are chosen to supply Radio Frequencies whose phases are approximately equal to most or all of the (N+1) radiating structures.

3. The antenna system according to claim 2, wherein it comprises:

a first assembly consisting of a radiating structure (1₁), a power supply and impedance matching assembly (3₁) with control logic (Cm) enabling it to operate as master to manage the antenna system tuning phase by varying the values of the variable elements so that they converge towards the values reading to tuning;

N additional assemblies (R₂. . . , R_n+1) virtually identical to the first assembly and placed in parallel to it, with control logic (Cs) of the power supply and impedance matching assemblies (3_i, 3_i. . . 3_n+1) adapted to operate as slave by copying at all times the statuses of the variable elements (41₁), (42₁), (12₁) . . . of the master to respectively the variable elements (41_i), (42_i), (12_i) . . . of the power supply and impedance matching assemblies (3_i),a power splitter (9) from 1 input to N+1 outputs (90₁) . . . (9_n+1) connected to the N+1 power supply and impedance matching assemblies (3₁. . . 3_n+l).

4. The antenna system according to claim 2, wherein:

the radiating structures (1₁) . . . (1_n+1) are loop type produced from a filiform conducting element which has one end (8₁) . . . (8_n+1) connected to earth and the other end (7₁) . . . (7_n+1) connected to the input (30₁) . . . (30_n+1) of a power supply and impedance matching assembly (3₁₋

) . . . (3_n+1) and wherein the power supply and impedance matching assemblies (3₁) . . . (3_n+1) are composed of at least;

a broad band impedance step-up transformer (21), a variable pretuning capacitor (20) placed in series with the primary coil of a broad band impedance step-up transformer (21) and whose free terminal forms the input (30₁) . . . (30_n+1), an ATU (4) connected to the secondary coil of the transformer (21).

5. The antenna system according to claim 2, wherein the radiating structures (1₁) . . . (1_n+1) are single-pole type, produced from a filiform conducting element which has one end left free and the other end (7₁) . . . (7_n+1) connected to the input (30₁) . . . (3_n+1) of a power supply and impedance matching assembly (3₁) . . . (3_n+1).

6. The antenna system according to claim 1, wherein it comprises at least:

a first assembly (R₁) consisting of a radiating structure (1₁), a power supply and impedance matching assembly (3₁) with control logic (Cm) enabling it to operate as master to manage the antenna system tuning phase by varying the values of the variable elements so that they converge towards the values leading to tuning an additional assembly (R₂) identical to the first assembly (R₁) and placed head to foot with this first assembly (R₁), but whose control logic (Cs) of the power supply and impedance matching assembly (3₂) makes it operate as slave by copying at all times during the tuning phase the statuses of the variable elements (41₂), (42₂), (12₁) . . . of the master to respectively the variable elements (41₂), (42₂), (12₂) . . . of this slave assembly (3₂), a hybrid power splitter (9′

) with one input and 2 outputs (90′

₁) (90′

₂) in phase opposition connected to the 2 power supply and impedance matching assemblies (3₁) and (3₂).

7. The antenna system according to claim 6, wherein the radiating structures (1₁) and (1₂) are single-pole type.

8. The antenna system according to claim 1 usable in a frequency range from 1.5 to 30 MHz.

9. The antenna system of claim 3, wherein the variable elements is one or more of capacitive elements, inductive elements and variable capacitors.

10. The antenna system of claim 6, wherein the variable elements is one or more of capacitive elements, inductive elements and variable capacitors.

11. A method to tune an antenna system comprising (N+1) virtually identical radiating structures, with N greater than or equal to 1, comprising at least a step where each of the radiating structures arranged parallel to each other is powered and matched in impedance for a given operating frequency value wherein it comprises at least the following steps:

associate to one radiating structure a master function and to the other radiating structures a slave function, transmit the tuning parameters of the master radiating structure to the slave radiating structures, vary at least one of the tuning parameters so that they converge and to obtain tuning.

12. The method according to claim 11 wherein it comprises at least the following steps:

a) initialise the tuning parameters for the “

master”

radiating structure,

b) transmit the tuning parameters to the other radiating structures,

c) determine the impedance value Z_measured output from the master radiating structure and compare said value with a specified value Z_fixed,

d) whilst the said determined value is different from the specified value determine the values of the parameters required to tune the master radiating structure,

e) vary at least one of the tuning parameters of the master radiating structure and repeat steps c to d.

13. The method according to claim 11, wherein the parameters are transmitted by modulating the information at a frequency value different from that of the system operation.

14. The method according to claim 11, wherein the operating frequency range is chosen in the range 1.5 to 30 MHz.