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Mobile phone is one of the most widely used today in mobile communications.This technology is very useful for communication but this raises severalproblems in a situation where silence is required such as in libraries, placesof worship, classrooms and others. Mobile phone jammer is a device that used toblock the incoming signal to a mobile phone from the base station. If themobile phone jammer is turned on then it can not form the incoming or outgoingcalls even sms. In this research, we designed a Yagi antenna (900MHz) to expandthe range of jamming because Yagi has a great gain. Results of impedance bygamma match are 50.16 Om. Obtained the value of VSWR Yagi is 1.46:1 and jammingdistance that can be taken approximately 16 meters, It is different from thejamming distance of helical antenna on a mobile phone jammer itself is about 4meters.

YAGI Antenna Design for Signal Phone Jammer