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1. (WO2001003352) JAMMER

Pub. No.:    WO/2001/003352    International Application No.:    PCT/KR2000/000108
Publication Date: Fri Jan 12 00:59:59 CET 2001 International Filing Date: Sun Feb 13 00:59:59 CET 2000
IPC: H04K 3/00
GIM, Hi, Chul
Inventors: GIM, Hi, Chul
The subject invention discloses a jammer for jamming at low power radio transmission/reception by wireless communication units such as cellular phones so that communications over said wireless communication units are interfered. A jammer in accordance with the subject invention comprises an oscillator for generating oscillating signal having a fixed frequency; an up converter for multiplying the frequency of said oscillating signal from said oscillator to up-convert it to one or more desired frequencies; power-on resetting means for resetting said up converter when said jammer is porwered on; one or more band extending means for extending the frequency band of output signal from said up converter; one or more power amplifier for amplifying output signal from said band extending means to a jammable level; and one or more antenna connected with each of said amplifiers.