Antenna device and radio communication equipment including the same

• US 20020163470A1
• Filed: 03/19/2002
• Published: 11/07/2002
• Est. Priority Date: 05/02/2001
• Status: Active Grant

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: Ishihara, Takashi, Sato, Jin, Nagumo, Shoji, Onaka, Kengo
• Granted Patent: US 6,958,730 B2
• Time in Patent Office: Days
• US Class Current: 343/700MS
• CPC Class Codes: H01Q 1/2283 mounted in or on the surface of a semiconductor substrate as a chip-type antenna or integrated with other components into an IC package
• CPC Class Codes: H01Q 11/20 V-antennas
• CPC Class Codes: H01Q 5/371 Branching current paths
• CPC Class Codes: H01Q 5/378 Combination of fed elements with parasitic elements
• CPC Class Codes: H01Q 9/0421 with a shorting wall or a shorting pin at one end of the element H01Q9/0414 takes precedence

Abstract

A feed radiation electrode including two branched radiation electrodes is provided on the surface of a substrate. Non-feed radiation electrodes are provided on both sides of the feed radiation electrode and near the branched radiation electrodes. The branched radiation electrode and the non-feed radiation electrode are double-resonated in the same frequency band. The branched radiation electrode and the non-feed radiation electrode are double-resonated in the same frequency band which is higher than that of the branched radiation electrode and the non-feed radiation electrode.

Claims

1. An antenna device comprising:

a substrate made of a dielectric or a magnetic material;

a feed element including a feeding terminal and a feed radiation electrode electrically connected to the feeding terminal; and

a plurality of non-feed elements each including a ground terminal and a non-feed radiation electrode electrically connected to the ground terminal;

the feed radiation electrode and the non-feed radiation electrodes being arranged on the surface of the substrate such that the non-feed radiation electrodes extend in the vicinity to and along the feed radiation electrode.

2. An antenna device according to claim 1, wherein the feed radiation electrode comprises a plurality of branched radiation electrodes having the feeding terminal as a common terminal.

3. An antenna device according to claim 2, wherein the branched radiation electrodes have effective line lengths at which the branched radiation electrodes are excited at different resonance frequencies.

4. An antenna device according to claim 1, wherein the feed radiation electrode is defined by a single radiation electrode, and the single radiation electrode has an effective line lengths at which the single radiation electrode is excited at the resonance frequency of the fundamental wave and the resonance frequencies of the higher-order harmonics, caused by feeding via the feeding terminal.

5. An antenna device according to claim 2, wherein each of the non-feed radiation electrodes extends from a ground terminal with the other end thereof defining an open end, each of the branched radiation electrodes extends from the feeding terminal with the other end thereof defining an open end, and the open-end sides of the branched radiation electrodes are arranged so as to be spaced from each other.

6. An antenna device according to claim 1, wherein capacitance-charging electrodes in the open ends of the radiation electrodes are provided, using side-surfaces of the substrate.

7. An antenna device according to claim 1, wherein the device further includes a rectangular circuit substrate, the substrate of the antenna device is arranged near a corner of the circuit substrate where two sides of the circuit substrate intersect each other with one of the non-feed radiation electrodes being arranged along one of the two sides and the other non-feed radiation electrode being arranged along the other side.

11. An antenna device according to claim 1, wherein the feeding terminal is a feed electrode provided on a side-face of the substrate or a terminal pin passing through the substrate.

13. Radio communication equipment comprising the antenna device defined in claim 1, and a circuit substrate having an elongated rectangular shape with long and short sides,

the antenna device having a width substantially equal to the length of one short side of the circuit substrate and being arranged along one short side and both long sides of the circuit substrate,

the open end of one of the non-feed radiation electrodes being arranged so as to face the long side of the circuit substrate, and the open end of the other non-feed radiation electrode being arranged so as to the other long side.

14. Radio communication equipment according to claim 13, wherein the feed radiation electrode extends from the feeding terminal and has the other end as an open end, the non-feed radiation electrodes extend from the ground terminals and have the other ends as open ends, respectively, the open end at the top of one non-feed radiation electrode having a longer effective line length than the other non-feed radiation electrode is arranged opposite to the direction in which the long side of the circuit substrate elongates so as to become distant from the non-feed radiation electrode.

15. Radio communication equipment comprising the antenna device defined in claim 1 and a circuit substrate including a transmission-reception circuit for radio waves, each ground terminal of the antenna device being connected to a ground terminal of the circuit substrate, the feeding terminal being connected to an input-output terminal of the transmission-reception circuit.

18. Radio communication equipment according to claim 17, wherein the feed radiation electrode extends from the feeding terminal and has the other end as an open end, the non-feed radiation electrodes extend from the ground terminals and have the other ends as open ends, respectively, the open end at the top of one non-feed radiation electrode having a longer effective line length than the other non-feed radiation electrode is arranged opposite to the direction in which the long side of the circuit substrate elongates so as to become distant from the non-feed radiation electrode.

8. An antenna device comprising:

a plurality of antennas; and

a circuit substrate having the plurality of antennas provided thereon,

the plurality of antennas each including a feed element having a feeding terminal and a feed radiation electrode extending from the feeding terminal, and a non-feed element having a ground electrode and a non-feed radiation electrode extending from the ground electrode, the feed element and the non-feed element being provided on a surface of a substrate,

the feed radiation electrode and the non-feed radiation electrode of each of the plurality of antennas having effective line lengths different from each other ,

the circuit substrate being provided with a ground pattern connecting the ground electrodes to each other and a feeding pattern connecting the feeding terminals to a common signal source.

9. An antenna device according to claim 8, wherein filter circuits are provided in the paths of the feeding pattern which is branched from the portion thereof connecting the feeding terminals to the common signal source and extended toward the feeding terminals, respectively.

10. An antenna device according to claim 8, wherein non-feed radiation electrodes are disposed on both sides of and near the feed radiation electrode on the surface of each substrate.

12. An antenna device according to claim 8, wherein the feeding terminal is a feed electrode provided on a side-face of the substrate or a terminal pin passing through the substrate.

16. Radio communication equipment comprising the antenna device defined in claim 8 and a circuit substrate including a transmission-reception circuit for radio waves, each ground terminal of the antenna device being connected to a ground terminal of the circuit substrate, the feeding terminal being connected to an input-output terminal of the transmission-reception circuit.

17. Radio communication equipment comprising the antenna device defined in claim 8, and a circuit substrate having an elongated rectangular shape with long and short sides,

the antenna device having a width substantially equal to the length of one short side of the circuit substrate and being arranged along one short side and both long sides of the circuit substrate,

the open end of one of the non-feed radiation electrodes being arranged so as to face the long side of the circuit substrate, and the open end of the other non-feed radiation electrode being arranged so as to the other long side.