Abstract-This paper introduces two new type active quasi circulators and three new type active circulators which use the outof-phase power divider/combiner, symmetric/anti-symmetric couplers and generic unilateral amplifiers.The proposed circuits are full-symmetric and composed of conventional microwave devices. Analytical relations for active quasi circulator modules are described. These modules have many variations and can be used for very wide frequency range depending on the type of the employed unilateral amplifier, power divider/combiner and symmetric/anti-symmetric couplers. Based on the proposed configurations, analysis and design of n-port active circulators are presented. Also they can be used in MMICs as active quasi circulators, active circulators and in other high frequency applications.

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This paper presents the design and simulation of a typical Ka band satellite beacon receiver for propagation experimentation. Using satellite beacon signal as a reference signal in satellite wave propagation study is one of the most important methos. Satellite beacons are frequently available for pointing large antennas, but such signals can be used for measuring the effect of natural phenomena such as atmospheric gases, water vapor, oxygen molecules, clouds, rain, dust and fog existing in different layers of the atmosphere, including troposphere and ionosphere.