Surface-mount antenna and communication device with surface-mount antenna

• US 6,323,811 B1
• Filed: 04/16/2001
• Issued: 11/27/2001
• Est. Priority Date: 09/30/1999
• Status: Expired due to Term

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: Tsubaki, Nobuhito, Kawahata, Kazunari, Nagumo, Shoji
• Primary Examiner(s): Ho, Tan
• Application Number:
  US09/807,636
• Time in Patent Office: 225 Days
• Field of Search: 343/700.MS, 343/702, 343/860, 343/846, 343/848
• US Class Current: 343/700.0MS
• CPC Class Codes: H01Q 1/243 with built-in antennas
• 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 19/005 Patch antenna using one or more coplanar parasitic elements
• CPC Class Codes: H01Q 5/328 between a radiating element and ground
• 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 first radiating electrode 5 and radiating electrode 6 are formed on an upper face 2c of a dielectric base 2 of a surface-mounted antenna 1, and a rectifying circuit 7 is formed on a side face 2b where radiating electrodes 5 and 6 are not formed. This facilitates configuration of a desired rectifying circuit 7 appropriate for the surface-mounted antenna 1, and rectification of the surface-mounted antenna 1 is facilitated. Also, since the rectifying circuit 7 is formed on the side face 2b of the dielectric base 2, effects of the rectifying circuit 7 on the first radiating electrode 5 and second radiating electrode 6 on the upper face 2c can be reduced. Accordingly, high gain and increased bandwidth of the surface-mounted antenna can be obtained.

Claims

1. A surface-mounted antenna comprising an approximately rectangular parallelepiped-shaped dielectric base;

wherein a radiating electrode is formed on an upper face of said dielectric base facing a board mounting bottom face,

and wherein said radiating electrode comprises an electric-power-supplying-side radiating electrode and a non-electric-power-supplying-side radiating electrode positioned away from said electric-power-supplying-side radiating electrode with a predetermined spacing therebetween, configured so as to resonate based on electric power supplied via a rectifying circuit from an external electric power supplying circuit and to perform transmission and reception of radio waves;

wherein a shorting portion of said electric-power-supplying-side radiating electrode and a shorting portion of said non-electric-power-supplying-side radiating electrode are positioned on a side face of said dielectric base in close proximity with a predetermined spacing therebetween;

wherein an open end portion of said electric-power-supplying-side radiating electrode and an open end portion of said non-electric-power-supplying-side radiating electrode are positioned on mutually different sides so as to avoid the face of said dielectric base upon which said shorting portions are formed; and

wherein said rectifying circuit is formed on a side face of said dielectric base.

2. A surface-mounted antenna according to claim 1, wherein said electric-power-supplying-side radiating electrode and said non-electric-power-supplying-side radiating electrode are formed so that the resonating directions thereof are approximately orthogonal.

3. A surface-mounted antenna according to claim 2, wherein said rectifying circuit is formed on a side different from the sides on which the open end of said electric-power-supplying-side radiating electrode and the open end portion of said non-electric-power-supplying-side radiating electrode are formed.

4. A surface-mounted antenna according to claim 2, wherein said rectifying circuit contains an inductance component formed at the shorting portion of said electric-power-supplying-side radiating electrode.

5. A surface-mounted antenna according to claim 2, wherein said rectifying circuit contains a capacitor formed between the shorting portion of said electric-power-supplying-side radiating electrode and the shorting portion of said non-electric-power-supplying-side radiating electrode.

6. A communication device, comprising a surface-mounted antenna according to claim 2.

7. A surface-mounted antenna according to claim 1, wherein said rectifying circuit is formed on a side different from the sides on which the open end of said electric-power-supplying-side radiating electrode and the open end portion of said non-electric-power-supplying-side radiating electrode are formed.

8. A surface-mounted antenna according to claim 3, wherein said rectifying circuit contains an inductance component formed at the shorting portion of said electric-power-supplying-side radiating electrode.

9. A surface-mounted antenna according to claim 7, wherein said rectifying circuit contains a capacitor formed between the shorting portion of said electric-power-supplying-side radiating electrode and the shorting portion of said non-electric-power-supplying-side radiating electrode.

10. A communication device, comprising a surface-mounted antenna according to claim 7.

11. A surface-mounted antenna according to claim 1, wherein said rectifying circuit contains an inductance component formed at the shorting portion of said electric-power-supplying-side radiating electrode.

12. A communication device, comprising a surface-mounted antenna according to claim 11.

13. A surface-mounted antenna according to claim 1, wherein said rectifying circuit contains a capacitor formed between the shorting portion of said electric-power-supplying-side radiating electrode and the shorting portion of said non-electric-power-supplying-side radiating electrode.

14. A communication device, comprising a surface-mounted antenna according to claim 13.

15. A communication device, comprising a surface-mounted antenna according to claim 1.