Exhibit 99

RF Monolithics and StatSignal IPC Enter into Technology Development Agreement

    DALLAS--(BUSINESS WIRE)--Dec. 15, 2004--RF Monolithics, Inc.
(Nasdaq:RFMI) (RFM) and StatSignal IPC, LLC, (SIPCO) today jointly
announced that the two companies have entered into a Technology
Development Agreement. Under this agreement RFM and SIPCO will jointly
commercialize the iModule2 Wireless MESH Network Transceiver Modules,
including application peripheral interface (API) technology to
simplify the software interface between a specific customer
application and a wireless MESH network. This follows the successful
joint development of an iModule2 Development Kit.
    This new generation of wireless MESH network modules will be based
on SIPCO's patented, field-proven and highly scalable wireless MESH
networking protocol, and RFM's Virtual Wire(TM) ultra-low power RF
transceivers. These two highly complimentary technologies have already
been jointly deployed in MESH utility meter reading systems across
thousands of nodes.
    SIPCO's patented technology and SOS-OEA protocols provide an
advanced wireless MESH networking capability with dynamic device
routing, system-wide broadcast messaging, system ID resolution and
remote field node configuration. SOS-OEA protocols contain a highly
robust mechanism for managing the communication of data acquired by
field sensor nodes to a host control center, and then delivering
control signals back from the control center to the field nodes. The
very low power consumption of RFM's Virtual Wire(TM) products for
these battery-powered modules is an essential ingredient of SIPCO's
MESH networking solutions. The iModule2 is being developed for RFM's
current low-power radio and next generation radio.
    "We are eager to continue the collaboration of our MESH networking
technology with RFM's state of the art radio technology. The
integration of RFM's enabling technology into our MESH networking
solutions has allowed us to provide a cost compelling solution that
allows customers to implement advanced remote automated control and
monitoring systems in a variety of applications. RFM's leadership in
low-power RF transceivers has been a key enabler to our successful
development, deployment, and commercialization of Wireless MESH
Network Transceiver Modules. Through this Agreement, we will extend
our relationship to combine and take our technologies to the next
level of product offerings and customer solutions," according to David
Petite, President of StatSignal IPC, LLC.
    "We are delighted to collaborate with SIPCO in the continued
development of the iModule2. Combining SIPCO's patented MESH
technology and RFM's patented low-power RF transceivers, the iModule2
will be a truly innovative product," stated David Kirk, Chief
Executive Officer of RFM. Mr. Kirk further commented, "This latest
technology agreement exemplifies our strategy to expand further into
the MESH networking market."

    About StatSignal IPC, LLC

    StatSignal Systems, Inc. is a pioneer in the field of wireless
mesh networks research and development. It was founded in 1994.
StatSignal IPC, LLC (SIPCO) was spun out in 2003 to pursue technology
licensing in new markets. SIPCO is based in Atlanta and is a privately
held company. SIPCO has developed an extensive Intellectual Property
and Patent portfolio covering MESH networking technologies using its
OEA designs for Wireless LAN to WAN and fixed wireless network
applications. These patents cover a variety of different applications
and products for remote automation control and monitoring and other
value-added services. SIPCO's patented mesh technology which has been
operational over four years is offered in the form of technology and
patent licenses, combining chipsets, software, and product reference
designs for OEMs, and system integrators.

    About RFM

    Celebrating its 25th Anniversary, RFM, headquartered in Dallas, is
a leading developer, manufacturer and supplier of a broad range of
radio frequency components and modules based on surface acoustic wave
technology for the automotive, consumer, distribution, industrial,
medical, security and telecommunications markets worldwide. For more
information on RF Monolithics, Inc., please visit our websites at
www.rfm.com and www.wirelessis.com.

    Forward-Looking Statements:

    This news release contains forward-looking statements, made
pursuant to the Safe Harbor Provision of the Private Securities
Litigation Reform Act of 1995, that involve risks and uncertainties.
Statements of RFM's plans, objectives, expectations and intentions
involve risks and uncertainties. Statements containing terms such as
"believe," "feel," "expects," "plans," "anticipates" or similar terms
are considered to contain uncertainty and are forward-looking
statements, as well as the other risks detailed from time to time in
RFM's SEC reports, including the report on Form 10-K for the year
ended Aug. 31, 2004. RFM does not assume any obligation to update any
information contained in this release.

    CONTACT: RF Monolithics, Inc., Dallas
             Carol Bivings, 972-448-3767
             or
             StatSignal IPC, LLC, Atlanta
             Candida Stevens, 404-252-5512