Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Reexamination Certificate
2008-03-06
2010-06-01
Dinh, Trinh V (Department: 2821)
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
C343S860000, C343S861000, C343S850000
Reexamination Certificate
active
07728781
ABSTRACT:
A transponder includes a notch filter to suppress the 1300 MHz at minimal product cost increase. The notch filter utilizes a printed transmission line length adjusted to a correct length. This notch filter will connect to the antenna matching circuit at a junction between the antenna and an ASIC as a shunt component with high impedance (e.g., greater than 500 Ohms) at 915 MHz and low impedance (e.g., less than 10 Ohms) at 1300 MHz. Since the operating impedance of the junction is about 200 ohms, the 915 MHz signal from the antenna will feed the ASIC without any attenuation with a high shunt impedance component, while the 1300 MHz signal will be attenuated significantly by a low shunt impedance component. The transponder is applicable for all types of RFID tags (e.g., passive, semi-passive, active, read only, read-write, read first, tag-talk first) and is well suited for tags operating at radio frequencies, including microwave frequencies (e.g., 902 MHz to 928 MHz) in the U.S.
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Caesar Rivise Bernstein Cohen & Pokotilow Ltd.
Dinh Trinh V
TC License Ltd.
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