Communications: radio wave antennas – Antennas – With radio cabinet
Patent
1998-05-12
2000-08-22
Wong, Don
Communications: radio wave antennas
Antennas
With radio cabinet
343725, 343895, 343901, H01Q 124
Patent
active
061079669
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a radio communication apparatus operating in the range of between 800 and 3000 MHz and comprising a rod antenna and a helical antenna which are connectable to a transceiver, the helical antenna having an active state for receiving and transmitting electromagnetic energy, and a passive state.
BACKGROUND ART
In radio communication apparatuses of the above-intimated type, in daily parlance known as mobile telephones, use is often made of two different antenna elements, one for the standby function and one in active use of the telephone during talks. The antenna which is employed during the standby state is often a so-called helical antenna since such an antenna is small and compact in physical dimensions. The helical antenna may be designed both as a quarter wave antenna and as a half wave antenna. On the other hand, the antenna element which is employed during talks may be physically considerably larger, since, during the standby period, it can often be retracted into the apparatus, collapsed or folded down along the longitudinal side of the apparatus, and so on.
The antenna which is employed during the standby period of the apparatus need not perform as well as the antenna which is employed during talks. Different alternatives for connecting the two antenna elements to the transceiver of the apparatus have been applied. Regardless of how the connection takes place, a certain interaction between the two antenna elements cannot be discounted. This implies not only an extremely complicated dimensioning, but also a reduction of the degree of efficiency.
PROBLEM STRUCTURE
The present invention has for its object to realise an antenna device of the type intimated by way of introduction, this antenna device being designed in such a manner that the helical antenna may be brought to a passive state in which it exercises slight or no effect on the rod antenna. The present invention further has for its object to design the antenna device such that it is simple and economical to manufacture but nevertheless performs well.
The objects forming the basis of the present invention will be attained if the antenna device intimated by way of introduction is characterized in that the helical antenna is transferable from the active to the passive state by axial compression.
Further advantages will be attained according to the present invention if the subject matter of the present invention is also given one or more of the characterizing features as set forth in appended claims 2 to 13.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
The present invention will now be described in greater detail hereinbelow, by means of a number of embodiments which are shown in the accompanying Drawings. In the accompanying Drawings:
FIG. 1 shows a first embodiment of an antenna device according to the present invention, in a state in which the helical antenna is active;
FIG. 2 shows the antenna device of FIG. 1 with the helical antenna in the passive state;
FIG. 3 is an enlarged view of the upper part of FIG. 1;
FIG. 4 shows a second embodiment of the antenna device according to the present invention, the helical antenna being in the active state;
FIG. 5 shows the antenna device of FIG. 4, but with the helical antenna shown in the passive state;
FIG. 6 is an enlarged view of the lower region of the helical antenna according to FIG. 4;
FIGS. 7-9 show details included in the antenna device according to FIGS. 4-6;
FIG. 10 shows a third embodiment of the antenna device according to the invention, the helical antenna being in the passive state;
FIG. 11 is a coupling diagram showing the function of the antenna devices according to FIGS. 1-9; and
FIG. 12 is a coupling diagram showing the function of the antenna device according to FIG. 10.
DESCRIPTION OF PREFERRED EMBODIMENTS
It generally applies according to the present invention that a helical antenna of the type under consideration here is a helical spiral of resilient metal wire which is matched to the frequency at which the transceiver i
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patent: 5216436 (1993-06-01), Hall et al.
patent: 5317325 (1994-05-01), Bottomley
patent: 5710567 (1998-01-01), Funke
patent: 5825330 (1998-10-01), Na et al.
patent: 5861859 (1999-01-01), Kanayama et al.
Chen Shih-Chao
Moteco AB
Wong Don
LandOfFree
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