Antenna and apparatus provided with the antenna

• US 7,046,198 B2
• Filed: 12/02/2002
• Issued: 05/16/2006
• Est. Priority Date: 12/04/2001
• Status: Expired due to Term

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Okazaki, Yasunao, Sakiyama, Kazuyuki, Okajima, Michio
• Primary Examiner(s): PHAN, THO GIA
• Application Number:
  US10/497,576
• Publication Number:
  US 20050012675A1
• Time in Patent Office: 1,261 Days
• Field of Search: 343/700.MS, 343/786, 343/815, 343/817, 343/824, 343/846, 343/853, 343/876, 333/258, 333/262
• US Class Current: 343/700.0MS
• CPC Class Codes: H01Q 1/36 Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewithH01Q1/08, H01Q1/14 take precedence
• CPC Class Codes: H01Q 1/38 formed by a conductive layer on an insulating support patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface H01Q15/142
• CPC Class Codes: H01Q 15/002 said selective devices being reconfigurable or tunable, e.g. using switches or diodes
• CPC Class Codes: H01Q 3/01 varying the shape of the antenna or antenna system
• CPC Class Codes: H01Q 3/247 by switching different parts of a primary active element
• CPC Class Codes: H01Q 9/0442 with particular tuning means
• CPC Class Codes: H01Q 9/0457 electromagnetically coupled to the feed line

Abstract

The present invention provides an antenna in which, on a dielectric substrate 1 having a back face on which a grounding conductor plate 14 is disposed, a plurality of conductor elements 12 are arranged in a matrix of rows and columns. Each of the dielectric elements 12 has a size which cannot function as an antenna. Above the conductor elements 12, a connecting element 13 overlapping two adjacent conductor elements 12 is disposed. Among the connecting elements 13, some cause the conductor elements 12 on both sides to be in a conductive condition, and others cause the conductor elements 12 on both sides to be in a non-conductive condition. The switching between the conductive and non-conductive conditions between the conductor elements 12 can be dynamically performed by a switching element.

Claims

1. Antenna comprising:

an array of a plurality of conductor elements which are mutually separated, and each of which does not independently function as an antenna;

coupling means for electro-magnetically coupling at least two conductor elements selected from the plurality of conductor elements, thereby causing the plurality of coupled conductor elements to function as one antenna element; and

a dielectric layer for supporting the plurality of conductor elements, wherein

the coupling means includes conducting means for electrically connecting the plurality of selected conductor elements, the conducting means includes a group of conductor pieces overlapping at least two adjacent conductor elements, the conductor piece is disposed so as to electrically connect the selected conductor elements, and

the antenna further comprises a dielectric film interposed between the respective conductor elements and the respective conductor pieces.

2. The antenna of claim 1, wherein the array of the conductor elements includes a matrix portion in which the plurality of conductor elements are arranged in a matrix of rows and columns.

3. The antenna of claim 2, wherein the matrix portion of the array is constituted by conductor elements having substantially the same shape.

4. The antenna of claim 2, wherein the matrix portion of the array is constituted by conductor elements having substantially the same size.

5. The antenna of claim 2, wherein each of the plurality of conductor elements has a size smaller than a wavelength of radio wave to be transmitted and/or received.

6. The antenna of claim 1, wherein the conducting means includes a plurality of switching elements for switching electrically conducting/non-conducting conditions between two conductor elements.

7. The antenna of claim 6, wherein the plurality of switching elements are arranged in a matrix of rows and columns.

8. The antenna of claim 7, further comprising a wiring layer for connecting a circuit for driving the plurality of switching elements to the plurality of switching elements.

9. The antenna of claim 6, wherein the switching elements are transistors.

10. The antenna of claim 6, wherein the switching element includes a conductor piece which is movably supported, and an actuator for moving the conductor element, and

the actuator can reciprocate the conductor piece between a first position in which a plurality of adjacent conductor elements are electrically connected by the conductor piece and a second position in which a plurality of adjacent conductor elements are not electrically connected.

11. An antenna module comprising:

the antenna of claim 6; and

a driving circuit for generating a signal for driving the plurality of switching elements.

12. An apparatus comprising:

the antenna of claim 6;

a driving circuit for generating a signal for driving the plurality of switching elements; and

control means for controlling the operation of the driving circuit, based on a signal received and/or transmitted by the antenna.

13. The antenna of claim 1, wherein the dielectric layer has a first main face on which the array of conductor elements is disposed, and a second main face opposite to the first main face, and

a grounding conductor is formed on the side of the second main face.

14. The antenna of claim 1, wherein the dielectric layer, the conductor elements, and the conducting means are laminated.

15. The antenna of claim 14, wherein the conducting means is provided in a movable manner, and

the antenna further comprises a moving mechanism for moving the conducting means between a conducting position in which the at least two conductor elements are made to mutually and effectively conduct, and a non-conducting position other than the conducting position.

16. Antenna comprising:

an array of a plurality of conductor elements which are mutually separated, and each of which does not independently function as an antenna;

coupling means for electro-magnetically coupling at least two conductor elements selected from the plurality of conductor elements, thereby causing the plurality of coupled conductor elements to function as one antenna element; and

a dielectric layer for supporting the plurality of conductor elements, wherein

the coupling means includes conducting means for electrically connecting the plurality of selected conductor elements,

wherein part of a plurality of conductor elements selected from the plurality of conductor elements function as a grounding conductor.

17. Antenna comprising:

an array of a plurality of conductor elements which are mutually separated, and each of which does not independently function as an antenna; and

coupling means for electro-magnetically coupling at least two conductor elements selected from the plurality of conductor elements, thereby causing the plurality of coupled conductor elements to function as one antenna element,

wherein the coupling means includes a conductor layer, and a plurality of dielectric elements disposed between the conductor layer and each of the conductor elements, and

the selected conductor elements are more strongly capacitive-coupled to the conductor layer than the conductor elements which are not selected.

18. The antenna of claim 17, wherein the array of the conductor elements includes a matrix portion in which the plurality of conductor elements are arranged in a matrix of rows and columns.

19. The antenna of claim 18, wherein the matrix portion of the array is constituted by conductor elements having substantially the same shape.

20. The antenna of claim 18, wherein the matrix portion of the array is constituted by conductor elements having substantially the same size.

21. The antenna of claim 18, wherein each of the plurality of conductor elements has a size smaller than a wavelength of radio wave to be transmitted and/or received.

22. The antenna of claim 17, wherein the dielectric elements positioned between the selected conductor elements and the conductor layer are thinner than the dielectric elements positioned between the conductor elements which are not selected and the conductor layer.

23. The antenna of claim 17, wherein a specific inductive capacity of the dielectric elements positioned between the selected conductor elements and the conductor layer is larger than a specific inductive capacity of the dielectric elements positioned between the conductor elements which are not selected and the conductor layer.

24. The antenna of claim 17, further comprising an actuator for moving the conductor elements so as to change a distance between each of the conductor elements and corresponding ones of the dielectric elements.

25. The antenna of claim 17, wherein the dielectric elements and the conductor elements are layered a plurality of times.

26. An apparatus comprising:

an antenna including;

an array of a plurality of conductor elements which are mutually separated, and each of which does not independently function as an antenna;

coupling means for electro-magnetically coupling at least two conductor elements selected from the plurality of conductor elements, thereby causing the plurality of coupled conductor elements to function as one antenna element; and

a dielectric layer for supporting the plurality of conductor elements, the coupling means including conducting means for electrically connecting the plurality of selected conductor elements, the conducting means including a plurality of switching elements for switching electrically conducting/non-conducting conditions between two conductor elements;

a driving circuit for generating a signal for driving the plurality of switching elements;

control means for controlling the operation of the driving circuit, based on a signal received and/or transmitted by the antenna; and

evaluating means for evaluating directivity, gain, and/or impedance of the antenna, based on the signal, wherein

conductor elements to be electrically connected are dynamically selected from the plurality of conductor elements, based on the evaluated result.

27. The apparatus of claim 26, wherein the evaluating means evaluates the directivity, gain, and/or impedance of the antenna for each of a plurality of combinations of conductor elements which are electrically and mutually connected by the switching elements.

28. The apparatus of claim 27, further comprising:

a memory for storing the evaluated results for the plurality of combinations of the conductor elements; and

a form designing section for selecting conductor elements to be electrically and mutually connected by the switching elements and for controlling the operation of the driving circuit, based on the evaluated results stored in the memory.

29. A system comprising a plurality of apparatuses of claim 28, wherein communications are performed between the plurality of apparatuses by radio waves via antennas of the respective apparatuses, and connection patterns of the plurality of conductor elements are dynamically changed for defining forms of the antennas of the respective apparatuses.