US Patent No. 9,356,345

COMMON ANTENNA FOR NEAR FIELD COMMUNICATION AND FREQUENCY MODULATION


Patent No. 9,356,345
Issue Date May 31, 2016
Title Common Antenna For Near Field Communication And Frequency Modulation
Inventorship Kai Wang, Shenzhen (CN)
Hongtao Liu, Shenzhen (CN)
Assignee ZTE CORPORATION, (CN)

Claim of US Patent No. 9,356,345

1. A common antenna for near field communication and frequency modulation, wherein, the common antenna comprises an antenna
coil, wherein the antenna feed line ends of the antenna coil are connected to a near field communication matching circuit
and a frequency modulation matching circuit respectively;
wherein
the antenna coil is a winding planar coil, and the near field communication matching circuit comprises: a first resistor and
a second resistor connected in series; a third resistor and a fourth resistor connected in series; and a fifth resistor, wherein
one end of the fifth resistor is connected between the first resistor and the second resistor, and the other end of the fifth
resistor is connected between the third resistor and the fourth resistor; wherein the second resistor and the fourth resistor
are connected to the two ends of the winding planar coil respectively; or

the antenna coil is a winding planar coil of chip-type which is connected with two signal lines and the near field communication
matching circuit comprises: a first resistor and a second resistor connected in series; a third resistor and a fourth resistor
connected in series; and a fifth resistor, wherein one end of the fifth resistor is connected between the first resistor and
the second resistor, and the other end of the fifth resistor is connected between the third resistor and the fourth resistor;
and the frequency modulation matching circuit comprises: a sixth resistor and a seventh resistor connected in series; and
an eighth resistor, wherein one end of the eighth resistor is connected to the ground, and the other end of the eighth resistor
is connected between the sixth resistor and the seventh resistor; wherein the second resistor is connected to one of the two
signal lines through a first switch; and the fourth resistor and the sixth resistor are connected to the other of the two
signal lines through a second switch.