Communications: radio wave antennas – Antennas – Microstrip
Reexamination Certificate
1999-10-22
2001-11-06
Wong, Don (Department: 2821)
Communications: radio wave antennas
Antennas
Microstrip
C333S202000
Reexamination Certificate
active
06313797
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a dielectric antenna having a filter function, a dielectric antenna having a duplexer function, and a radio apparatus using these.
2. Description of the Related Art
A microstrip antenna and a dielectric antenna have been used as an antenna in the microwave band, especially one suitable for a small-scale radio apparatus.
Furthermore, in general a reception filter is provided in order to extract a desired frequency signal from received waves, and a transmission filter is used to transmit only the desired frequency signal as a transmission wave. An antenna in which such filters are provided in the antenna portion to enable the entire device to be miniaturized is disclosed in Japan Unexamined Patent Publication No. 8-181533.
The above described microstrip antenna having a filter function comprises a microstrip antenna, the microstrip antenna comprising a ground conductor and a microstrip conductor provided on a dielectric substrate. And a dielectric resonator is constituted on the dielectric substrate. By this arrangement, the microstrip antenna and the dielectric filter can be provided on a single dielectric substrate. However, since the antenna portion and the filter portion are independent of each other, transmitting means must be separately provided in order to input the receive signal to the filter portion, and loss occurs in this part. This causes deterioration in the electrical characteristics.
SUMMARY OF THE INVENTION
To overcome the above described problems, preferred embodiments of the present invention provide a dielectric antenna including a filter and a dielectric antenna including a duplexer, wherein loss problems caused when transmission means (a waveguide) is provided between the antenna portion and the filter portion are eliminated, and which are miniaturized and have excellent electrical characteristics, and a radio apparatus using these.
One preferred embodiment of the present invention provides a dielectric antenna including a filter, comprising: a dielectric substrate; an antenna portion comprising; a radiation electrode having one short-circuited end and one open end and provided on or within the dielectric substrate; a filter portion comprising; at least one resonance electrode provided on or within the dielectric substrate, and a external coupling electrode in association with the resonance electrode; and the radiation electrode and the resonance electrode being coupled to each other.
In the above described dielectric antenna including a filter, an electrode electrically isolated from ground and which generates a static capacitance between the resonance electrode and the radiation electrode may be provided; and the resonance electrode and the radiation electrode may be coupled to each other by static capacitance.
Another preferred embodiment of the present invention provides a dielectric antenna including a filter, comprising: a dielectric substrate; a slot antenna-type antenna portion comprising; a ground electrode opened in a slot shape and provided on a dielectric substrate; a filter portion comprising; at least one resonance electrode provided on or within the dielectric substrate, and a external coupling electrode in association with the resonance electrode; and an electrode coupled to the resonance electrode and coupled to the slot antenna.
According to the above described structures and arrangements, since an antenna portion is provided on or within a dielectric substrate, and in addition, one or multiple resonance electrodes are provided to form a filter portion, and the resonance electrodes and the antenna portion are coupled, there is no need to provide a special transmission guide or the like to connect the antenna portion and the filter portion, and consequently a dielectric antenna including a filter with no transmission guide loss and excellent electrical characteristics can be formed.
Yet another preferred embodiment of the present invention provides a dielectric antenna including a filter, comprising: a first dielectric substrate; an antenna portion comprising: a predetermined shaped electrode which comprises an external coupling electrode and provided on or within the first dielectric substrate; a second dielectric substrate;
a filter portion comprising; at least one resonance electrode provided on or within the second dielectric substrate, and an external coupling electrode in association with the resonance electrode; and a substrate on which an electrode connecting the external coupling electrode of the antenna portion and the external coupling electrode of the filter portion are disposed and the antenna portion and the filter portion are mounted.
With this constitution, as regards the antenna portion and the filter portion, the material, dimensions, electrode pattern, and the like of the dielectric substrate can be designed with maximum suitability. In addition, a single-body dielectric antenna including a filter, which is a unified component capable of being mounted on a mount substrate, can be obtained.
Furthermore, yet another preferred embodiment of the present invention provides a dielectric antenna including a duplexer, comprising: a transmission filter and a reception filter, each comprising the above described filter portion; and the resonance electrode of an output stage of the transmission filter and the resonance electrode of an input stage of the reception filter being coupled to an antenna portion.
When the antenna is used for transmission in this way, by providing the duplexer portion and the antenna portion together, the high-frequency circuit portion can be miniaturized even further.
Moreover, yet another preferred embodiment of the present invention provides a radio apparatus comprising the above described dielectric antenna including a filter, or the above described dielectric antenna including a duplexer, as a high-frequency circuit portion.
As a consequence, it is possible to achieve a radio apparatus which has a high-frequency circuit portion of excellent characteristics, and which is entirely miniaturized.
Other features and advantages of the present invention will become apparent from the following description of the invention which refers to the accompanying drawings.
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Patent Abstracts Of Japan, vol. 17, No. 528 (E-1437) Sep. 22, 1993 & JP 05 145316 A (Mitsubishi Electric), Jun. 11, 1993, abstract.
Hiroshima Motoharu
Ishihara Jinsei
Kato Hideyuki
Kurita Junichi
Kushihi Yuichi
Dinh Trinh Vo
Murata Manufacturing Co. Ltd.
Wong Don
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