LOOP ANTENNA AND COMMUNICATION CONTROL DEVICE

• US 20170207535A1
• Filed: 07/30/2014
• Published: 07/20/2017
• Est. Priority Date: 07/30/2014
• Status: Active Grant

• Current Assignee: Renesas Electronics Corporation
• Original Assignee: Renesas Electronics Corporation
• Inventors: TSUKUDA, Tatsuaki, SASAKI, Hideki
• Granted Patent: US 10,205,237 B2
• Time in Patent Office: Days
• CPC Class Codes: H01Q 1/24 with receiving set
• CPC Class Codes: H01Q 3/24 varying the orientation by switching energy from one active radiating element to another, e.g. for beam switching
• CPC Class Codes: H01Q 7/00 Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
• CPC Class Codes: H02J 50/27 characterised by the type of receiving antennas, e.g. rectennas
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices

Abstract

A loop antenna 1 includes: a first electrode terminal 2c; a second electrode terminal 2d arranged to make a pair with the first electrode terminal 2c; and a loop-shaped member 2 which has one end connected to the first electrode terminal 2c and the other end connected to the second electrode terminal 2d, is wound a plurality of times, and is made of a conductive material. The first electrode terminal 2c and the second electrode terminal 2d are arranged so as to make a pair with respect to a center line 3 of the loop-shaped member 2. Further, the loop-shaped member 2 includes a first loop-shaped member 2a, a second loop-shaped member 2b, and an intersection part 2e. The intersection part 2e is arranged on the center line 3 in a plan view, and the loop-shaped member 2 is continuously connected and formed to be symmetrical with respect to the center line 3.

Claims

1. A loop antenna comprising:

a first electrode terminal;

a second electrode terminal arranged to make a pair with the first electrode terminal; and

a loop-shaped member which has one end connected to the first electrode terminal and the other end connected to the second electrode terminal and is made of a conductive material,

wherein the first electrode terminal and the second electrode terminal are arranged so as to make a pair with respect to a center line of a loop shape of the loop-shaped member,

the loop-shaped member is wound a plurality of times, and includes an intersection part at which mutually adjacent loop-shaped members intersect with each other in a plan view,

the intersection part is arranged so as to overlap with the center line in a plan view, and

the loop-shaped member is continuously connected and formed to be symmetrical with respect to the center line.

2. The loop antenna according to claim 1,

wherein the loop-shaped member includes a plurality of the intersection parts including a first intersection part and a second intersection part,

the first intersection part is arranged so as to overlap with the center line in a plan view, and

a plurality of the second intersection parts are provided and the second intersection parts are arranged so as to make a pair with respect to the center line.

3. The loop antenna according to claim 2,

wherein in a case in which the number of windings is an even number, the number of the intersection parts is an odd number.

4. The loop antenna according to claim 2,

wherein in a case in which the number of windings is an odd number, the number of the intersection parts is an even number.

5. The loop antenna according to claim 2,

wherein a plurality of the first intersection parts are provided, and the first intersection parts are arranged so as to overlap with the center line and separately arranged on a terminal side where the first and second electrode terminals are located and on a side opposite to the terminal side.

6. The loop antenna according to claim 1,

wherein the loop-shaped member includes a first loop-shaped member and a second loop-shaped member adjacent to each other, and the loop-shaped member has a switching part at which switching from the first loop-shaped member to the second loop-shaped member or switching from the second loop-shaped member to the first loop-shaped member is made.

7. The loop antenna according to claim 6,

wherein the loop-shaped member includes two switching parts, and

the intersection part is a part at which the two switching parts intersect with each other in a plan view.

8. The loop antenna according to claim 1,

wherein the loop-shaped members in the loop-shaped member wound a plurality of times are arranged to overlap with each other in a plan view.

9. A communication control device comprising:

a wiring substrate on which a wiring is formed;

a first connection terminal formed on a main surface of the wiring substrate and connected to one electrode terminal of a loop antenna;

a second connection terminal formed on the main surface of the wiring substrate and connected to the other electrode terminal of the loop antenna;

a power supply circuit connected to the first and second connection terminals;

a communication circuit connected to the first and second connection terminals;

a first wiring connected to the first connection terminal;

a second wiring connected to the second connection terminal;

a first rectifier circuit connected to the first wiring;

a second rectifier circuit connected to the second wiring; and

a noise filter circuit connected to the first and second wirings and arranged between the first and second connection terminals and the first and second rectifier circuits,

wherein each of the first and second connection terminals, the first and second wirings, the noise filter circuit, and the first and second rectifier circuits are arranged so as to make respective pairs with respect to a center line of an arrangement of parts.

10. The communication control device according to claim 9,

wherein the noise filter circuit is resistors arranged so as to make a pair with respect to the center line.

11. The communication control device according to claim 9,

wherein the noise filter circuit is an inductor.

12. The communication control device according to claim 9, further comprising:

a first resonance capacitor arranged between the first connection terminal and the noise filter circuit and connected to the first wiring; and

a second resonance capacitor arranged between the second connection terminal and the noise filter circuit and connected to the second wiring,

wherein the first and second resonance capacitors are arranged so as to make a pair with respect to the center line.

13. The communication control device according to claim 9, further comprising:

a DC/DC converter connected to the first and second wirings and configured to generate DC voltage based on voltage rectified by the first and second rectifier circuits.

14. The communication control device according to claim 9,

wherein the first and second connection terminals are arranged at an end part of the main surface of the wiring substrate.

15. A communication control device comprising:

a substrate having a first surface, a second surface opposite to the first surface, and a first electrode terminal and a second electrode terminal provided on the first surface;

a continuous conductive wiring including a first wiring layer in which a first wiring is formed, a second wiring layer in which a second wiring is formed, and a plurality of penetrating electrodes penetrating between the first wiring layer and the second wiring layer and connecting the first wiring and the second wiring; and

a wiring substrate in which a first connection terminal connected to one electrode terminal of the conductive wiring, a second connection terminal connected the other electrode terminal of the conductive wiring, a power supply circuit connected to the first and second connection terminals, and a communication circuit connected to the first and second connection terminal are formed on a main surface,

wherein a plurality of wiring layers laminated between the first surface and the second surface of the substrate are formed of the first wiring, the second wiring and the plurality of the penetrating electrodes, one end is connected to the first electrode terminal, and the other end is connected to the second electrode terminal,

the conductive wiring is wound by at least two turns along an outer periphery of the substrate from the first electrode terminal,

the plurality of the penetrating electrodes include a plurality of penetrating electrode pairs having a pair of the penetrating electrodes formed of two penetrating electrodes,

at least one of the plurality of penetrating electrode pairs connects the first wiring and the second wiring,

the conductive wiring continuously extends from the first wiring layer to the second wiring layer and from the second wiring layer to the first wiring layer via at least one of the plurality of penetrating electrode pairs,

the first and second electrode terminals are arranged so as to make a pair along an outer periphery of the first surface in a plan view, and

the plurality of the penetrating electrode pairs are arranged so as to face the first electrode terminal and the second electrode terminal making a pair in a plan view, or each of at least two penetrating electrode pairs of the plurality of penetrating electrode pairs is arranged at the same distance from each of the first electrode terminal and the second electrode terminal making a pair, or the plurality of the penetrating electrode pairs are arranged so as to face the first electrode terminal and the second electrode terminal making a pair and each of at least two penetrating electrode pairs of the plurality of penetrating electrode pairs is arranged at the same distance from each of the first electrode terminal and the second electrode terminal making a pair.

16. The communication control device according to claim 15,

wherein the conductive wiring includes an intersection part at which conductive parts, each of which connect a pair of the penetrating electrodes in each of any two penetrating electrode pairs among the plurality of the penetrating electrode pairs, intersect with each other in a plan view.

17. The communication control device according to claim 16,

wherein in a case in which the number of turns of the conductive wiring along the outer periphery of the substrate is an even number, the number of the intersection parts is an odd number.

18. The communication control device according to claim 16,

wherein in a case in which the number of turns of the conductive wiring along the outer periphery of the substrate is an odd number, the number of the intersection parts is an even number.