Abstract :
The phase control in microwave circuits is an important process for many applications. Especially, in the phase array antennas, this is the main principle of operation. In the array antennas, each array element is fed by an individual oscillator. The radiation pattern and the radiated power of the antenna can be adjusted by controlling the phase of the oscillators. In such applications, the phase shifters have been used frequently. However, their high costs, difficulties in efficiency and design are important disadvantages. Another new technique for microwave phase control is called the “Injection locking”. In this method, a single reference signal (injection signal) is connected (injected) in parallel to each microwave oscillator. When the certain conditions are met, the phase of the each oscillator can be controlled by the signal amplitudes, oscillator’s free running frequencies and their quality factors (Q). Thus, the new method offers more cost effective and precise phase control than the phase shifters in microwave applications. In this paper, this new phase control technique is examined in the theory and in the original application of a 1-GHz oscillator system.
NaturalLanguageKeyword :
Microwave Phase Control , Method of Injection Locking , Method of Phase Locking , Array Antennas , Spatial Power Combining
