EXHIBIT B

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EVIDENCE OF USE FOR U.S. PATENT NO. 8,610,573

Title: Radio frequency module and methods of transmitting/receiving data

Application No.: US 12/558,484

Filing Date: September 11, 2009

Issue Date: December 17, 2013

Accused Product:

Source: https://www.dexatek.com/%E5%89%AF%E6%9C%AC-iot-module

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Source: https://www.dexatek.com/_files/ugd/6752fc_e1ea7d00e3074aa8bc81bf6c420e93a8.pdf

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Evidence of Use

Claim Language Evidence of Infringement

1. A radio frequency module 

comprising:

Dexatek Technology provides the DK-9185 Wireless LAN module (i.e., “radio frequency module”) comprising the 

ARM v8m MCU and Cortex-M0 MCU.

 

Source: https://www.dexatek.com/_files/ugd/6752fc_e1ea7d00e3074aa8bc81bf6c420e93a8.pdf

Radio frequency module

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Claim Language Evidence of Infringement

a base member including a 

printed circuit board having a 

first surface and a second 

surface;

Dexatek DK-9185 module includes a base member including a printed circuit board (PCB) that has a first and a 

second surface. 

Source: https://fccid.io/SZY-DK9185/Internal-Photos/Internal-Photos-5977874.pdf

Base member

First surface

Second surface on back side

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Claim Language Evidence of Infringement

a transceiver assembly 

located on the printed circuit 

board and including:

a transceiver; and

The Dexatek DK-9185 module is deployed with an RTL-8721DM solution (i.e., “transceiver”).

 

Source: https://www.dexatek.com/_files/ugd/6752fc_e1ea7d00e3074aa8bc81bf6c420e93a8.pdf

Transceiver assembly

Transceiver

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Claim Language Evidence of Infringement

a matching/filtering network 

having first and second ends;

Dexatek DK-9185 module includes an inductor and capacitor circuit network (i.e., “matching/filtering network”). 

The matching/filtering network is an essential part of RF design to enable maximum power transfer between a 

source and a load. The matching/filtering network comprises passive components such as inductors and 

capacitors. The first end of the network is connected to the RTL8721DM chip (i.e., “transceiver”) and the second 

end of the network is connected to another component. 

Source: https://www.dexatek.com/_files/ugd/6752fc_e1ea7d00e3074aa8bc81bf6c420e93a8.pdf

Matching/filtering network

First end

Second end

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Claim Language Evidence of Infringement

Source: https://www.allaboutcircuits.com/textbook/radio-frequency-analysis-design/selectedtopics/understanding-matching-networks/ 

Patent Specification: 

Source US8610573, col 4, lines 61-66

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Claim Language Evidence of Infringement

the matching/filtering network 

having a plurality of passive 

series connected electrical 

components in a linear 

arrangement, with the first 

end thereof electrically 

connected to the transceiver;

Dexatek DK-9185 module’s inductor and capacitor circuit network (i.e., “matching/filtering network”) forms a linear 

arrangement where the first end is connected to the RTL8721DM chip (i.e., “transceiver”). 

Source: https://www.dexatek.com/_files/ugd/6752fc_e1ea7d00e3074aa8bc81bf6c420e93a8.pdf

Matching/filtering network

Plurality of passive components

First end connected to transceiver

Transceiver

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Claim Language Evidence of Infringement

a ground plane formed on the 

first surface and surrounding 

at least a substantial portion 

of the transceiver assembly;

The Dexatek DK-9185 module includes a metal segment (i.e., “ground plane”) on the first surface of the PCB, 

which surrounds a substantial portion of the transceiver assembly.

Source: https://www.dexatek.com/_files/ugd/6752fc_e1ea7d00e3074aa8bc81bf6c420e93a8.pdf

Ground plane on the first surface

Transceiver assembly

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Claim Language Evidence of Infringement

a radio frequency shield 

electrically coupled to the 

ground plane and covering at 

least a substantial portion of 

the transceiver assembly;

The Dexatek DK-9185 module includes a shield (i.e., “radio frequency shield”) that covers the transceiver 

assembly and is soldered to the metal segment (i.e., “ground plane”). 

Source: https://fccid.io/SZY-DK9185/Internal-Photos/Internal-Photos-5977874.pdf

Radio frequency shield

Ground plane Transceiver assembly

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Claim Language Evidence of Infringement

Source: 

https://device.report/m/01317795ddf8971de7b297db548ea0c8aa5437198e35cf90edd9f31b2d029af2.pdf

Radio frequency shield

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a chip antenna located on the 

first surface of the printed 

circuit board outside of the 

shield and extending 

generally parallel with the 

matching/filtering network; 

and

The Dexatek DK-9185 module includes a chip antenna outside the shield located on the first surface of the PCB. 

The antenna extends in parallel with the inductor and capacitor circuit network (i.e., “matching/filtering network”).

Source: https://fccid.io/SZY-DK9185/Internal-Photos/Internal-Photos-5977874.pdf

Chip antenna

Radio frequency shield

Matching/filtering network

Extending parallel

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Source: https://www.dexatek.com/_files/ugd/6752fc_e1ea7d00e3074aa8bc81bf6c420e93a8.pdf

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a radio feed point extending 

between the chip antenna 

and the second end of the 

matching/filtering network, the 

chip antenna together with 

the matching/filtering network 

and the feed point forming a 

generally U-shape.

Dexatek DK-9185 module has a radio feed point extending between the chip antenna and the second end of the 

network (i.e., “matching/filtering network”). This arrangement forms a U-shape with the components.

Source: https://www.dexatek.com/_files/ugd/6752fc_e1ea7d00e3074aa8bc81bf6c420e93a8.pdf

Chip antenna

Matching/filtering network

Second end

Radio feed point

Forming U-shape

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