Antenna for receiving signals from GPS and GSM

Details Antenna for receiving signals from GPS and GSM Antenna for receiving signals from GPS and GSM

2000-09-08

2001-05-08

Le, Hoanganh (Department: 2821)

Communications: radio wave antennas

Antennas

Microstrip

C343S895000, C343S702000, C343S725000

Reexamination Certificate

active

06229488

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to antenna, and more particularly to an antenna for receiving signals from Global Positioning System (GPS) and Global System for Mobile Communications (GSM).
BACKGROUND OF THE INVENTION
This is a scientific age. The communication between people in different continents has been made very convenient. This greatly expands the activity space of human beings. Thus, the entire globe is sometimes called a “village”. Further, it is also desired that people can precisely identify the location of a person or an object whether moving or not. Thus a variety of Global Positioning System (GPS) and Global System for Mobile Communications (GSM) based communication equipment have been developed to fulfil such needs. Moreover, the use of such GPS and GSM based communication equipment have become a part of our daily life.
Conventionally, antenna of mobile phone and antenna of GPS based communication equipment are separated. That is, antenna of mobile phone can only receive communication signals, while GPS based communication equipment can only receive coordinate signals. As such, it is required to mount an antenna of mobile phone
11
and an antenna of GPS
12
on a digital communication equipment
10
for receiving GPS and GSM signals simultaneously as shown in FIG.
1
. This inevitably increases cost as well as complicates installation procedure and wiring. It is thus much desired by the art to develop an antenna which can receive both communication signals from GSM and coordinate signals from GPS simultaneously.
Conventionally, a patch antenna is employed in GPS. Patch antenna has the advantages of compact, not susceptible to temperature change, and low power loss. As such, it is often that a patch antenna is mounted on a cylindrical member. One of such patch antennas is a ceramic patch antenna
20
as shown in FIG.
2
. This ceramic patch antenna
20
is widely employed in GPS based communication equipment. As shown, patch antenna
20
comprises a substrate
21
made of ceramic material, a square or rectangular microstrip patch
22
and a ground plane
13
formed on the top and bottom respectively both by photolithography and etching, a coaxial cable
24
having a top feeding pin
241
penetrated through ground plane
23
and substrate
21
to contact with feeding point
221
of the microstrip patch
22
, and an outer conductor
242
with part thereof being in contact with ground plane
23
. This is a complete patch antenna
20
. Further, signals are transmitted through feeding pin
241
.
For receiving signals from GPS and GSM simultaneously, a typical implementation is to integrate patch antenna
20
of GPS and helical antenna
31
of GSM on sides of circuit board
30
as shown in FIG.
3
. As such, it is possible to receive coordinate signals from GPS through patch antenna
20
and communication signals from GSM through helical antenna
31
respectively. As such, received signals are then filtered and amplified by electronics on the circuit board
30
. Finally, signals are sent to digital communication equipment through cables
24
and
32
respectively. Such integration is advantageous over the one shown in FIG.
1
. But it is still unsatisfactory for the purpose for which the invention is concerned for the following reasons:
1. Bulky.
2. Complicated manufacturing processes.
3. High cost.
Thus, it is desirable to provide an improved antenna for receiving signals from GPS and GSM having the advantages of slim, reliable, and inexpensive in order to overcome the above drawbacks of prior art.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an antenna apparatus wherein a patch antenna of GPS and a helical antenna of GSM are formed on a circumference of a dielectric body and a feeding pin in an axial central through hole thereof such that the antenna apparatus can receive signals from GPS and GSM respectively. It is possible to greatly reduce the size of the antenna apparatus as well as reduce the manufacturing and transporting costs.
It is another object of the present invention to provide an antenna apparatus wherein a patch antenna of GPS is formed on a periphery adjacent at one side of a dielectric body, a linearly polarized patch antenna of GSM is formed on a periphery adjacent at the other opposed side of the dielectric body, and the linearly polarized patch antenna is attached to a feeding pin in an axial central through hole of the dielectric body such that the antenna apparatus can receive signals from GPS and GSM respectively.
It is still another object of the present invention to provide an antenna apparatus wherein a patch antenna of GPS is formed on a periphery adjacent at one side of a dielectric body, a first linearly polarized patch antenna of GSM is formed on a periphery adjacent at the other opposed side of the dielectric body, a second linearly polarized patch antenna of GSM is formed on a periphery adjacent at the other opposed side of the dielectric body, and the linearly polarized patch antennas are attached to a feeding pin in an axial central through hole of the dielectric body such that the antenna apparatus can receive signals from GPS and dual tone signals from GSM respectively.
The above and other objects, features and advantages of the present invention will become apparent from the following detailed description taken with the accompanying drawings.


REFERENCES:
patent: 6150984 (2000-11-01), Suguro et al.
patent: 6160512 (2000-12-01), Desclos et al.

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