Communications: radio wave antennas – Antennas – Slot type
Reexamination Certificate
2001-02-21
2002-05-21
Wong, Don (Department: 2821)
Communications: radio wave antennas
Antennas
Slot type
C343S7000MS
Reexamination Certificate
active
06392609
ABSTRACT:
TECHNICAL FIELD
The present invention relates to an antenna device according to the preamble of claim
1
. The present invention also relates to an antenna assembly comprising at least one antenna device and another antenna device according to the preamble of claim
23
.
BACKGROUND ART
The most common used antenna type for GPS applications is a microstrip antenna, a so called patch antenna. The main disadvantage with the microstrip antennas is relatively high manufacturing costs. Another disadvantage is that microstrip antennas have a high built-in height, due to the fact that they require an earth plane and an intermediate dielectric material.
Other types of antennas having circular polarisation characteristics, which are cheaper to produce, are some types of helix-antennas or double-loop antennas. The drawback with this type of antenna is that they cannot be compared to the patch antenna in terms of narrow bandwidth and antenna gain. Narrow bandwidth is a crucial requirement for a GPS antenna in order to reduce noise and interference e.g. from a cellular phone antenna near by.
SUMMARY OF THE INVENTION
The present invention seeks to provide an antenna device, especially for GPS applications, which is cheap to manufacture and has a narrow bandwidth compared to prior art antennas.
According to an aspect of the present invention, there is provided an antenna device as specified in claim 1.
The invention is also directed to an antenna assembly combining the antenna device with another antenna as specified in claim 23.
An advantage with the present invention is that the antenna device is cheap to manufacture.
Another advantage with the present invention is that the antenna device has a narrow bandwidth, suitable for GPS applications.
Still another advantage is that the present invention has a low built-in height compared to prior art antennas.
An advantage with an embodiment of the present invention having a reflector is that the antenna gain of the antenna device can be increased compared to an antenna device without a reflector.
An advantage with the antenna assembly is that the antenna device according to the present invention may easily be integrated with another antenna device, not affecting the height of the antenna assembly.
REFERENCES:
patent: 5914693 (1999-06-01), Takei et al.
patent: 6028561 (2000-02-01), Takei
patent: 6031503 (2000-02-01), Preiss et al.
patent: 6150989 (2000-11-01), Aubry
patent: 6225959 (2001-05-01), Gordon
Chen Shih-Chao
Jacobson & Holman PLLC
SMARTEQ Wireless AB
Wong Don
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