Appeal 2007-0473
Application 09/969,584
includes means for decentering the impedance matching of the
antenna of the terminal that are activated only when the device is in
send mode (Specification 3: 14-21).
Appellants’ means for decentering the impedance matching of the
antenna of the terminal can consist of means for centering the
matching of the antenna to optimize its efficiency (Specification 5:31-
33).
Appellants state that an exemplary means for centering the matching
of the antenna of the terminal consists of a matching circuit having a
Pi or T structure with a reactive component switched by means of a
PIN diode (Specification 6:2-4).
The prior art Tuttle patent describes that “the transmitting sensitivity
of the antenna 18 can be modified by impedance matching, or
intentional mis-matching of components forming the antenna circuit
46 during transmitting modes of operation. (Col. 5, ll. 22-26;
apparatus shown in Fig. 5).
The prior art Tuttle patent further describes means for impedance
matching or mismatching that (Col. 5:33-42):
Preferably, the receiver sensitivity of the device 14 is adjusted
by matching or mismatching the impedance of the antenna 18
with respect to a circuit element that has a current adjustable
impedance. Preferably, the impedance adjustable circuit
element is a Schottky diode that is electrically configured to
receive a dc bias current. The diode is forward biased by the
current which changes impedance of the diode, and allows for
realization of a desired impedance as will be discussed pursuant
to FIGS. 3-7. Alternatively, the diode can be reverse biased.
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Last modified: September 9, 2013