Communications: radio wave antennas – Antennas – High frequency type loops
Patent
1991-04-16
1993-10-26
Hajec, Donald T.
Communications: radio wave antennas
Antennas
High frequency type loops
343702, 343744, 343867, H01Q 1112, H01Q 124
Patent
active
052570339
ABSTRACT:
A transmitter has a transmitting antenna which may be formed as a loop etched onto a printed circuit board. The transmitting system includes an oscillator which generates a signal at a fundamental frequency to be transmitted and which is fed to a radiating loop or transmitting antenna. Located inside of this loop, and which may also be etched onto the printed circuit board, is an inner passive loop which is in series with a capacitor or which is connected to the outer loop by the capacitor. The size of the capacitor and the printed inner loop operate to remove harmonics of the fundamental frequency generated by the oscillator. In this way, the present invention operates to transmit a signal at a fundamental frequency which is at a high power level while lowering the power of signals unintentionally transmitted at harmonics of this fundamental frequency by utilizing a circuit which is simple, inexpensive and compact.
REFERENCES:
patent: 3550137 (1970-12-01), Kuecken
patent: 4862181 (1989-08-01), Ponde De Leon et al.
patent: 5030963 (1991-07-01), Tadama
patent: 5166646 (1992-11-01), Avanic et al.
Design Tech International Inc.
Hajec Donald T.
Le Hoang-anh
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