Antenna apparatus and radio communicating apparatus

• US 7,830,315 B2
• Filed: 09/28/2007
• Issued: 11/09/2010
• Est. Priority Date: 12/21/2006
• Status: Expired due to Fees

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Sugiyama, Yuuichi, Soekawa, Kouji
• Primary Examiner(s): Barnie; Rexford N
• Assistant Examiner(s): Tabler; Matthew C
• Application Number:
  US11/864,462
• Publication Number:
  US 20080150810A1
• Time in Patent Office: 1,138 Days
• Field of Search: 343/702
• US Class Current: 343/702
• CPC Class Codes: H01Q 1/243 with built-in 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 9/0407 Substantially flat resonant element parallel to ground plane, e.g. patch antenna dipole H01Q9/285; monopole H01Q9/40
• CPC Class Codes: H01Q 9/40 Element having extended radiating surface
• CPC Class Codes: H01Q 9/42 with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Abstract

The present invention relates to an antenna apparatus capable of multifrequency resonance and realizes downsizing and multifrequency resonance. The present invention relates to an antenna apparatus capable of multifrequency resonance or a radio communicating apparatus (e.g., portable phone) including the antenna apparatus; toward a feed element connected to and supplied with electricity from a feeding unit of a circuit substrate (printed circuit substrate), a non-feed element is disposed with over the circuit substrate or outside the circuit substrate; and the feed side or the open side of the feed element is electromagnetically coupled to the non-feed element to enable resonance in the frequency band of the non-feed element in addition to resonance in the frequency band of the feed element.

Claims

1. An antenna apparatus capable of multifrequency resonance, comprising:

a feed element supplied with electricity;

a single or a plurality of non-feed element(s) disposed over a circuit substrate or outside the circuit substrate having a feeding portion disposed for supplying electricity to the feed element, the non-feed element(s) having an end by which the non-feed element(s) is located adjacent to the feed element; and

a single or a plurality of coupling portion(s) that electromagnetically couples the feed element to the non-feed element(s) by the end, the feed element including first and second antenna element units which have different element length, the first and second antenna element units being formed from a connecting portion to the feeding portion that is on the circuit substrate, the antenna apparatus resonating in a frequency band of the feed element, the antenna apparatus resonating in a frequency band of the non-feed element.

2. The antenna apparatus of claim 1, wherein

the coupling portion is one or both of a feed-side coupling portion that electromagnetically couples a feed side of the feed element to the non-feed element and an open-side coupling portion that electromagnetically couples an open side of the feed element to the non-feed element.

3. The antenna apparatus of claim 1, wherein

the coupling portion has a coupling strength that is changed depending on a distance between the feed element and the non-feed element.

4. The antenna apparatus of claim 1, wherein

the feed element includes a feed connecting unit connected to the feeding portion and a plurality of antenna element units branched from the feed connecting unit, the antenna element units each having a resonant frequency different for each antenna element unit.

5. The antenna apparatus of claim 1, wherein

the feed element is located with an element portion bent within a width corresponding to a width of the circuit substrate to establish an antenna length necessary for resonance in a frequency band that should be set.

6. The antenna apparatus of claim 1, wherein

the feed element connects a feed connecting unit to the feeding portion of the circuit substrate and locates an element portion outside the circuit substrate.

7. The antenna apparatus of claim 1, wherein

the feed element includes an element portion located parallel to an edge of the circuit substrate.

8. The antenna apparatus of claim 1, wherein

the non-feed element includes an element portion disposed in the vicinity of the feed element connected to the feeding portion of the circuit substrate.

9. The antenna apparatus of claim 1, wherein

the non-feed element includes an element portion disposed in the vicinity of an open side of the feed element.

10. The antenna apparatus of claim 1, wherein

the non-feed element includes an element portion located parallel to the feed element.

11. The antenna apparatus of claim 1, wherein

the non-feed element includes an element portion having a folding back portion bent on a feed side of the feed element and the folding back portion is set as the feed-side coupling portion.

12. The antenna apparatus of claim 1, wherein

the non-feed element includes an element portion having a folding back portion bent on an open side of the feed element and the folding back portion is set as an open-side coupling portion.

13. The antenna apparatus of claim 1, wherein

the feed element is disposed on a dielectric material.

14. The antenna apparatus of claim 1, wherein

the non-feed element is supported by a housing with the circuit substrate built therein.

15. A radio communicating apparatus using an antenna apparatus capable of multifrequency resonance, comprising:

a feed element supplied with electricity;

a single or a plurality of non-feed element(s) disposed over a circuit substrate or outside the circuit substrate having a feeding portion disposed for supplying electricity to the feed element, the non-feed element(s) having an end by which the non-feed element(s) is located adjacent to the feed element; and

a single or a plurality of coupling portion(s) that electromagnetically couples the feed element to the non-feed element(s) by the end, the feed element including first and second antenna element units which have different element length, the first and second antenna element units being formed from a connecting portion to the feeding portion that is on the circuit substrate, the antenna apparatus resonating in a frequency band of the feed element, the antenna apparatus resonating in a frequency band of the non-feed element.

16. The radio communicating apparatus of claim 15, wherein

the coupling portion is one or both of a feed-side coupling portion that electromagnetically couples a feed side of the feed element to the non-feed element and an open-side coupling portion that electromagnetically couples an open side of the feed element to the non-feed element.

17. The radio communicating apparatus of claim 15, wherein

the feed element includes a feed connecting unit connected to the feeding portion and a plurality of element portions branched from the feed connecting unit, the element portions each having a resonant frequency different for each element portion.

18. The radio communicating apparatus of claim 15, wherein

the feed element is located with an element portion bent within a width corresponding to a width of the circuit substrate to establish an antenna length necessary for resonance in a frequency band that should be set.

19. The radio communicating apparatus of claim 15, wherein

the feed element connects a feed connecting unit to the feeding portion of the circuit substrate and locates an element portion outside the circuit substrate.

20. The radio communicating apparatus of claim 15, wherein

the feed element includes an element portion located parallel to an edge of the circuit substrate.

21. The radio communicating apparatus of claim 15, wherein

the non-feed element includes an element portion disposed in the vicinity of the feed element connected to the feeding point of the circuit substrate.

22. The radio communicating apparatus of claim 15, wherein

the non-feed element includes an element portion disposed in the vicinity of an open side of the feed element.

23. The radio communicating apparatus of claim 15, wherein

the non-feed element includes an element portion located parallel to the feed element.

24. The radio communicating apparatus of claim 15, wherein

the non-feed element includes an element portion having a folding back portion bent on a feed side of the feed element and the folding back portion is set as the feed-side coupling portion.

25. The radio communicating apparatus of claim 15, wherein

the non-feed element includes an element portion having a folding back portion bent on an open side of the feed element and the folding back portion is set as an open-side coupling portion.

26. The radio communicating apparatus of claim 15, wherein

the feed element is disposed on a dielectric material.

27. The radio communicating apparatus of claim 15, wherein

the non-feed element is supported by a housing with the circuit substrate built therein.