Communications: radio wave antennas – Antennas – With radio cabinet
Patent
1997-10-02
2000-02-29
Wimer, Michael C.
Communications: radio wave antennas
Antennas
With radio cabinet
343895, 343900, H01Q 124
Patent
active
060314931
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to an antenna unit suitable for a portable radio terminal used for two frequency bands and a wideband antenna unit for a portable radio terminal.
BACKGROUND ART
Nowadays, with the movement toward small and light-weight portable radio terminals such as portable telephones, an extending whip antenna is attached to those so that it can be contained in the telephone body to improve the portability of the portable telephone in carrying and it can be pulled out from the telephone body in communicating to improve the antenna characteristic.
FIGS. 12 show an example of such an antenna unit: FIG. 12(A) shows the state where an antenna is pulled out from a telephone body, and FIG. 12(B) shows the state where the antenna is contained in the telephone body.
In these Figs., a metal fitting 12 for attaching and detaching the antenna is provided at the upper portion of the box 11 of the portable telephone body and a print distributing board 13 on which circuits are mounted is provided in the box 11. The metal fitting 12 is electrically connected to a high frequency circuit (feeding circuit) 14 on the board 13 via a spring 15.
The antenna body is composed of a fixed antenna unit 20 and a slide antenna unit 30. The fixed antenna unit 20 has a helical antenna 21 and the lower end of the helical antenna 21 is electrically connected to an antenna junction metal fitting 23 through a base 22. Further, the antenna junction metal fitting 23 is screwed in the metal fitting 12.
The helical antenna 21 is covered with an antenna cover 25 having a cylindrical cup shape and formed by insulation material and the opening of this cover 25 is attached to the antenna junction metal fitting 23. Note that, an antenna fixing unit 26 is provided at the center position of the upper end of the antenna cover 25.
An antenna cover 33 is provided so as to freely slide on the wind axis of the helical antenna 21 through the hole of an antenna fixing unit 26 and the hole at the center of the antenna junction metal fitting 23.
Furthermore, at the top of the antenna cover 33, a knob 34 for inserting and pulling out the slide antenna unit 30 is formed in one body, and in the vicinity position of that, a fixing part 35 having larger diameter is formed so that the fixing part 35 is fixed at the center hole of the antenna fixing unit 26 when the antenna cover 33 is contained in the box 11 so as to connect the fixing part 35 and the antenna fixing unit 26. Also, a conductive stopper 41 is attached to the lower end of the antenna cover 33 so that the lower end of a monopole antenna 31 is electrically connected to this stopper 41.
Note that, in FIGS. 12(A) and 12(B), the portion where hatching is not added other than the print distributing board 13 represents that it is made of conductive material.
According to the above structure, the lower end of the helical antenna 21 is connected to the high frequency circuit 14 via a signal path of the base 22--antenna junction metal fitting 23--metal fitting 12--spring 15 to supply electric power by the high frequency circuit 14 so that the helical antenna 21 operates as a transmitting/receiving antenna.
However, as shown in FIG. 12(B), in the state where the slide antenna unit 30 is contained in the box 11, the monopole antenna 31 is located at the position where it is not connected to the high frequency circuit 14 and is not electromagnetically connected to the helical antenna 21; thus the antenna 31 becomes the state where it does not regard transmission and reception.
Accordingly, in this case, transmission and reception, more particularly, reception of call incoming in carrying is conducted only by the helical antenna 21.
On the contrary, as shown in FIG. 12(A), when the slide antenna unit 30 is pulled out from the box 11, the lower end of the monopole antenna 31 is connected to the high frequency circuit 14 through a signal path of the stopper 41--metal fitting 12--spring 15 so as to receive electric power.
Further, in this state, the monopole antenna 31 is positioned on the
REFERENCES:
patent: 5546094 (1996-08-01), Egashira
Ito Hiroki
Kanayawa Yoshiki
Kuroda Shin-ichi
Tsuda Shinichiro
Maioli Jay H.
Sony Corporation
Wimer Michael C.
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