Antenna device and method for manufacturing the same

• US 6,369,777 B1
• Filed: 05/22/2001
• Issued: 04/09/2002
• Est. Priority Date: 07/23/1999
• Status: Expired due to Fees

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Kishimoto, Yasunori, Nishida, Norihisa, Koumoto, Shinzo, Ishito, Yusuke, Tsuda, Hiroaki, Ohara, Masahiro, Sako, Koji
• Primary Examiner(s): Wong, Don
• Assistant Examiner(s): CHEN, SHIH CHAO
• Application Number:
  US09/787,936
• Time in Patent Office: 322 Days
• Field of Search: 343/702, 343/725, 343/872, 343/873, 343/895, 343/893, 343/906
• US Class Current: 343/895
• CPC Class Codes: H01Q 1/242 specially adapted for hand-held use
• 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 1/40 Radiating elements coated with or embedded in protective material
• CPC Class Codes: H01Q 5/378 Combination of fed elements with parasitic elements
• CPC Class Codes: H01Q 9/42 with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Abstract

Relating to an antenna device used in wireless unit for mobile communication or the like, it is an object to present an antenna device hardly causing uneven pitch or deformation of antenna elements, high in gain and reliability, excellent in productivity, and having two or more impedance characteristics, and a method of manufacturing the same. Both ends of plural bands (16) are alternately connected consecutively, both ends of plural bands (18) are alternately connected consecutively in a first antenna element (11) made of a thin metal plate of nearly circular spiral form projecting alternately in the longitudinal direction, a second antenna element (12) made of a thin metal plate formed by projecting in a nearly semicircular tubular form in the front direction is disposed at a nearly concentrical position, a mounting bracket (13) is connected to one end of the first antenna element (11), and the outer circumference of the members is covered with a cover (15) made of an insulating resin, thereby composing an antenna device.

Claims

1. An antenna device comprising:

a) a first antenna element of spiral form having nearly parallel plural bands formed so that both ends of the plural bands may be connected alternately and consecutively, and formed so that at least one of the plural bands may be projected,

b) a second antenna element of meandering form having nearly parallel plural bands formed so that both ends of the plural bands may be connected alternately and consecutively, and formed so that at least one of the plural bands may e projected,

c) a core made of an insulating resin for disposing said first antenna element and second antenna element as being insulated from each other,

d) a mounting bracket connected to one end of said first antenna element, and

e) a cover made of an insulating resin for covering the outer circumference of said first antenna element, second antenna element, core and mounting bracket, while exposing a part of said mounting bracket.

2. The antenna device of claim 1, wherein said plural bands of the first antenna element have a shape so that a conductive thin metal plate is punched and then projected.

3. The antenna device of claim 1, wherein at least two or more bands of said plural bands of the first antenna element are formed to project alternately.

4. The antenna device of claim 3, wherein at least two or more bands of said plural bands of the first antenna element are formed to project alternately in a nearly semicircular form in the longitudinal direction.

5. The antenna device of claim 3, wherein at least two or more bands of said plural bands of the first antenna element are formed to project by every other one in a nearly semicircular form.

6. The antenna device of claim 3, wherein at least two or more bands of said plural bands of the first antenna element are formed to project alternately in a nearly trapezoidal form in the longitudinal direction.

7. The antenna device of claim 3, wherein at least two or more bands of said plural bands of the first antenna element are formed to project by every other one in a nearly trapezoidal form.

8. The antenna device of claim 3, wherein at least two or more bands of said plural bands of the first antenna element are formed to project alternately in a nearly square form in the longitudinal direction.

9. The antenna device of claim 3, wherein at least two or more bands of said plural bands of the first antenna element are formed to project by every other one in a nearly square form.

10. The antenna device of claim 3, wherein at least two or more bands of said plural bands of the first antenna element are formed to project alternately in a nearly polygonal form in the longitudinal direction.

11. The antenna device of claim 3, wherein at least two or more bands of said plural bands of the first antenna element are formed to project by every other one in a nearly polygonal form.

12. The antenna device of claim 1, wherein said plural bands of the second antenna element are formed to project after punching a conductive thin metal plate.

13. The antenna device of claim 1, wherein at least two or more bands of said plural bands of the second antenna element are formed to project in a same direction.

14. The antenna device of claim 13, wherein at least two or more bands of said plural bands of the second antenna element are formed to project in a nearly semicircular form in a same direction.

15. The antenna device of claim 13, wherein at least two or more bands of said plural bands of the second antenna element are formed to project in a nearly trapezoidal form in a same direction.

16. The antenna device of claim 13, wherein at least two or more bands of said plural bands of the second antenna element are formed to project in a nearly square form in a same direction.

17. The antenna device of claim 13, wherein at least two or more bands of said plural bands of the second antenna element are formed to project in a nearly polygonal form in a same direction.

18. The antenna device of claim 1, further comprising an extension for adjustment preliminarily formed for cutting off part of the plural bands of the first antenna element or plural bands of the second antenna element, for adjusting the electric length of the first antenna element or second antenna element.

19. The antenna device of claim 1, wherein the width between junctions at both ends of the plural bands formed spirally in said first antenna element is set smaller than the width between junctions at both ends of the plural bands projecting in a meandering form of said second antenna element.

20. The antenna device of claim 1, wherein the plural bands disposed nearly parallel of said second antenna element are inclined by a specified angle to the plural bands disposed nearly parallel of said first antenna element.

21. The antenna device of claim 1, wherein the insulating resin for forming said core and the insulating resin for forming said cover are the same.

22. The antenna device of claim 1, wherein said mounting bracket is formed integrally with said first antenna element.

23. A manufacturing method of antenna device comprising the steps of:

a) forming a first element plate by punching a conductive thin metal plate of a specified dimension and pressing a part of said punched thin metal plate,

b) forming a second element plate by a step of punching a conductive thin metal plate of a nearly same dimension as said first element plate, and a step of pressing a part of said punched thin metal plate,

c) stacking up the outer circumferential parts of said first element plate and second element plate in the thickness direction,

d) insert molding for forming a core having a plurality of resin support parts by fixing the pressed portion of the stacked first element plate and the pressed portion of the second element plate,

e) cutting off the outer circumference of said first element plate and second element plate being stacked up, near said core, and separating said core including the pressed portion of said first element plate and the pressed portion of said second element plate from said outer circumference, and

f) insert molding for forming a cover for covering the outer circumference by holding said resin support parts of said core.

24. The manufacturing method of antenna device of claim 23,

wherein said step of forming said first element plate comprises the steps of:

punching a conductive thin metal plate of a specified dimension, and providing nearly parallel plural rectangular holes of same length so that both ends may be convex and concave alternately, thereby forming plural linear portions,

separating one side of convex and concave portion of the plural rectangular holes from the outer circumferential part in a linked state, and

projecting at least a part of the plural linear portion, in a state coupled to the outer circumference at other side.

25. The manufacturing method of antenna device of claim 23,

wherein said step of forming said second element plate comprises the steps of:

punching a conductive thin metal plate in a state of plural linear portions linked alternately right and left at narrow linkage, so that nearly parallel plural hook holes of same length may be alternately reverse in direction,

separating one side of said plural hook holes from the outer frame in a linked state, and

projecting at least a part of said plural linear portions.