Wave transmission lines and networks – Coupling networks – Electromechanical filter
Reexamination Certificate
2002-10-15
2004-06-01
Summons, Barbara (Department: 2817)
Wave transmission lines and networks
Coupling networks
Electromechanical filter
C333S195000, C310S31300R, C029S025350
Reexamination Certificate
active
06744336
ABSTRACT:
TECHNICAL FIELD OF THE INVENTION
The present invention is directed, in general, to surface acoustic wave (SAW) circuits and, more specifically, to a wafer-scale package for a SAW circuit and method of manufacturing such wafer-scale package therefor.
BACKGROUND OF THE INVENTION
Surface acoustic wave (SAW) devices for use in electronic signal processing have been advantageously adopted by the electronics industry. Such SAW devices have several advantages over more conventional technologies. They can be designed to provide complex signal processing in a single unit, and they also offer an additional benefit, which is their ability to be mass produced using semiconductor microfabrication techniques. These techniques lead to lower-cost devices, having only small operating characteristic variations from unit to unit. Since SAW devices may be implemented in rugged, light-weight and power-efficient modules, they find many important applications, especially in mobile, wireless and spaceborne communication systems. Such communication systems typically operate over a wide range of frequencies from about 10 megahertz to about two gigahertz. The specific signal processing capabilities and frequency range of SAW devices may be customized to allow SAW devices to perform several roles in electronic systems.
An important feature of the SAW device is its geometry, which incorporates two metal patterns having interdigitated conductive lines or traces. Such interdigitated metal structures are formed on a piezoelectric substrate and act as input and output signal paths when an AC signal voltage is applied to one of the metal structures. This AC voltage induces a surface acoustic wave in the underlying substrate wherein the acoustic wave propagates to the output structure. The interdigitated metal lines of the signal receiving portion detect the acoustic wave and convert it into a filtered electrical output signal. SAW devices, operating in the Rayleigh wave mode, can generally be designed to provide bandpass filters that achieve responses, which would otherwise require several hundred inductors and capacitors in conventional LC filter designs. Proper operation and containment of the acoustic waves require precise construction of both the central and outlying regions.
Turning briefly to
FIG. 1
, illustrated is a diagram of a conventional packaged SAW device
100
. As illustrated, the packaged SAW device
100
includes interdigitated metal structures
110
and a piezoelectric substrate
120
, both of which are manufactured on a wafer substrate
130
. Formed over the interdigitated metal structures
110
and the piezoelectric substrate
120
, and contacting the wafer substrate
130
, is a hermetic enclosure
140
. It is common for the hermetic enclosure
140
to have a substantially larger footprint than the footprint of the piezoelectric substrate
120
. An aspect ratio of 6 to 1, representing a ratio of the footprint of the hermetic enclosure to the footprint of the piezoelectric substrate, is not uncommon in today's electronics industry. Packaging the Prior Art SAW devices
100
as shown in
FIG. 1
has become well accepted, unfortunately, the outermost footprint of the packaged SAW device
100
is larger than currently desired in the electronics industry, particularly the wireless telephone industry.
Accordingly, what is needed in the art is a method of packaging SAW devices that does not experience the space limitations experienced in the prior art methods.
SUMMARY OF THE INVENTION
To address the above-discussed deficiencies of the prior art, the present invention provides a SAW circuit package and a method of fabricating the package. In one embodiment, the package includes: (1) a substantially planar piezoelectric substrate, (2) SAW circuit conductors located over the substrate, (3) a passivation layer located over the SAW circuit conductors, and (4) a layer of mass loading material located between the saw circuit conductors and the passivation layer, the substrate, the layer of mass loading material and the passivation layer cooperating to form a hermetic seal to isolate the SAW circuit conductors from an environment proximate the package.
REFERENCES:
patent: 5119172 (1992-06-01), Cho et al.
patent: 5215546 (1993-06-01), Cho et al.
patent: 5726610 (1998-03-01), Allen et al.
patent: 6078229 (2000-06-01), Funada et al.
patent: 6185801 (2001-02-01), Kadota et al.
patent: 6246148 (2001-06-01), Flowers et al.
patent: 6287894 (2001-09-01), Sawin
patent: 1-218116 (1989-08-01), None
patent: 3-160811 (1991-07-01), None
patent: 5-275963 (1993-10-01), None
patent: 5-275964 (1993-10-01), None
patent: 6-132760 (1994-05-01), None
Jean Phalippou; “Sol-Gel: A Low Temperature Process for the Materials of the New Millennium”; www.solgel.com; Jun. 2000.
Goetz Martin
Schwab Sarah
Clarisay, Incorporated
Summons Barbara
LandOfFree
Wafer-scale package for surface acoustic wave circuit and... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Wafer-scale package for surface acoustic wave circuit and..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Wafer-scale package for surface acoustic wave circuit and... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3362057