Wave transmission lines and networks – Coupling networks – Wave filters including long line elements
Reexamination Certificate
2006-06-06
2006-06-06
Ham, Seungsook (Department: 2817)
Wave transmission lines and networks
Coupling networks
Wave filters including long line elements
Reexamination Certificate
active
07057481
ABSTRACT:
The present invention is to provide a PCB based band-pass filter for cutting out harmonic of high frequency wherein in manufacturing a circuit board of a wireless communication product technology of PCB production is utilized to mount an input microstrip line, an output microstrip line, an open circuit microstrip line, and a short circuit microstrip line of the band-pass filter on the circuit board. By utilizing the present invention, it is possible of utilizing an unoccupied area of the circuit board to mount a band-pass filter thereon without using an additional filter of high frequency. Moreover, the band-pass filter is adapted to cut out harmonic of two, three, or four times of a fundamental frequency caused by nonlinear distortion of a power amplifier of the wireless communication product.
REFERENCES:
patent: 3345589 (1967-10-01), Di Piazza
patent: 3662294 (1972-05-01), Jacobs et al.
patent: 4288766 (1981-09-01), Okita
patent: 4489292 (1984-12-01), Ogawa
patent: 4999596 (1991-03-01), Nakatani et al.
patent: 6104259 (2000-08-01), Miyaura
Alpha Networks Inc.
Bacon & Thomas PLLC
Ham Seungsook
LandOfFree
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