Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Reexamination Certificate
2002-01-14
2004-03-09
Dougherty, Thomas M. (Department: 2834)
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
C333S187000
Reexamination Certificate
active
06703763
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a bulk acoustic wave multiplexer device, and more particularly to a bulk acoustic wave multiplexer device having miniaturized size and less interference, and can be integrated with micro-electro-mechanical switch devices, so as to operate multiplexing function.
BACKGROUND OF THE INVENTION
The mobile communication is so vigorous development that speed up the requirement of the RF (radio frequency) wireless electronic device. The mobility of the wireless communication product is depended on the size of device and the lifetime of battery. In addition, the devices manufacturers are dedicated to develop the tiny, cheaper and the more well performance devices. The final step to miniaturize the device is to integrate it with the IC to form a system on chip (SOC). Presently, in the RF front-end of the wireless system, one of the devices that still can not be integrated with the IC, is RF front-end filter. In the future, the RF front-end filter will be the occupied space and the necessary device in the double, triple or multiple frequency standards. The multiplexer obtained by associating the RF switch with RF front-end filter would be the key to decide the communication quality. would be the key to decide the communication quality.
The RF front-end filter belongs to the surface acoustic filter is more ordinarily used. In the past, the surface acoustic wave filter is not only to be the RF front-end filter but also to be the channel selective filter in the IF (intermediate frequency) band. But to accompany with the development of the direct spread spectrum transformation technique (that is, the zero-IF or near zero-IF technique), it does not need any analog IF filter, so the application to the surface acoustic wave filter is extended to the RF filter. However, the surface acoustic wave filter itself has the larger insertion loss and it has worse power durability stand. In the past, it is not rigorous about the insertion loss standard in the use of the IF channel selective filter, and it belongs to the RF back-end so that it is not necessary to use a well power durability stand. Now, if it is used in the RF front-end, the above-mentioned both standards will be the problem to the surface acoustic wave filter.
DESCRIPTION OF THE PRIOR ART
Recently, the techniques of bulk acoustic wave multiplexer is used, such as the FBAR device (film bulk acoustic resonator) developed by the HP Company (refer to the U.S. Pat. No. 6,060,818), and the SBAR device (stack bulk acoustic resonator) developed by Nokia Company (refer to the U.S. Pat. No. 5,872,493), the volume of hi-efficiency products can be reduced, and can be operated within 400 MHz to 10 GHz. The duplexer for CDMA mobile phones is a kind of filtering device. The volume of the bulk acoustic wave duplexer is just as a small part of the ceramic duplexer. It is provided with better isolation, insertion loss, and power durability. Novel, mini wireless mobile communication devices having high efficiency can be manufactured by the manufacturers with the assembly of these properties.
FIG. 1
is a perspective showing a bulk acoustic wave multiplexer of the U.S. Pat. No. 5,185,589 of the Westinghouse Company in America. As shown in
FIG. 1
, in the whole wave-filtering multiplexer, a structure of multi-frequency division device is adopted, wherein numeral
10
indicates an input port of the bulk acoustic wave multiplexer that is enabled to receive signals and carrier waves with various frequencies. The dotted-line frames of numerals
11
,
11
′, and
11
″ respectively indicate the bulk acoustic wave multiplexer with various frequency bands, and numerals
12
,
12
′, and
12
″ indicate the output ports corresponding with various frequency bands.
SUMMARY OF THE INVENTION
According to the disadvantages of the above-mentioned conventional multiplexer, the object of the present invention is to provide a bulk acoustic wave multiplexer having a smaller volume, so as to integrate it onto a single chip.
According to the bulk acoustic wave multiplexer of the present invention, it provides a multi-bands multiplexer, and enables a decrease of the interference thereof. It is another object of the present invention.
According to the bulk acoustic wave multiplexer of the present invention, it enables a large decrease of the insertion loss and an increase of the isolation thereof It is again another object of the present invention.
According to the bulk acoustic wave multiplexer of the present invention and the manufacturing method thereof, it provides a bulk acoustic wave multiplexe that can be combined with the package, thus enables a smaller volume. It is a further object of the present invention.
In order to achieve the above-mentioned objects, the bulk acoustic wave multiplexer of the present invention can be combined with the micro-electro-mechanical switch and integrated on the same chip.
In order to achieve the above-mentioned objects, combining with a bulk acoustic wave filter, the bulk acoustic wave multiplexer of the present invention can be coupled to several ports, thus a low-loss multi-channel multiplexer is achieved.
In order to achieve the above-mentioned objects, the bulk acoustic wave multiplexer of the present invention can be further combined with a bulk acoustic wave filter and a micro-electro-mechanical switch-controlling multi-channel multiplexer, thus the noises between the channels is lowered.
In order to achieve the above-mentioned objects, while manufacturing the bulk acoustic wave multiplexer of the present invention, the chip level package containing micro-electro-mechanical switch can be used for lowering the complication of the manufacturing process.
The present invention will be better understood and its numerous objects and advantages will become apparent to those skilled in the art by referencing to the following drawings.
REFERENCES:
patent: 5160870 (1992-11-01), Carson et al.
patent: 6204737 (2001-03-01), Ella
Lee Chengkuo
Tsai Shu-Hui
Asia Pacific Microsystems, Inc.
Dougherty Thomas M.
Troxell Law Office PLLC
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