اثر القفز الترددي في مميزات عمل الهوائيات المتلائمة

This purpose of this research is to Increase protection pointer of communication system jamming by using Frequency-Hopped and Encyclical specter. Using Frequency-Hopping and adaptive antennas with each other will effect frequency- Hopping Antenna Characteristics, specially the (Radiation Pattern). This means it is difficult to distinguish between signal and jamming, especially at the limits of frequency band domain. Our search confirms that the Frequency-Hopping leads to dislodgment of radiation pattern far away from the prepared angle to receive the signal to an angle where signal to jamming ratio would be much less.