发明名称 |
RFID module |
摘要 |
An RFID module including an antenna element forming an RFID antenna; an RFID circuit block to which the antenna element is connected; and a first resonance frequency adjustment circuit having an element that includes a drain terminal connected to the antenna element, a gate terminal that is grounded, and a source terminal that is grounded, wherein a pull-up resistor is connected between the drain terminal and a power supply. |
申请公布号 |
US8917160(B2) |
申请公布日期 |
2014.12.23 |
申请号 |
US201113243586 |
申请日期 |
2011.09.23 |
申请人 |
Sony Corporation;Sony Mobile Communications Inc. |
发明人 |
Tsushima Takaaki;Takahashi Toshiyuki;Takeda Toshihiko;Mihara Zenkichi |
分类号 |
H04Q5/22;G06K19/07;H04B5/00 |
主分类号 |
H04Q5/22 |
代理机构 |
Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P. |
代理人 |
Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P. |
主权项 |
1. An RFID module comprising:
an antenna element forming an RFID antenna; an RFID circuit block to which the antenna element is connected; and a first resonance frequency adjustment circuit having an element that includes a drain terminal connected to the antenna element, a gate terminal that is grounded, a source terminal that is grounded, wherein a pull-up resistor is connected between the drain terminal and a power supply such that the drain terminal has separate connections to the antenna element and to the power supply, wherein a DC level of the drain terminal is configured to be decreased through a capacitance between the drain terminal and the gate terminal when an AC waveform of a predetermined amplitude or more is input on the basis of a voltage excited in the RFID antenna when the RFID module comes close to an R/W device, and the first resonance frequency adjustment circuit is configured to shift a resonance frequency of a loop antenna toward lower frequencies by increasing a drain-source parasitic capacitance value on the basis of the decrease of the DC level of the drain terminal. |
地址 |
Tokyo JP |