ANALYSIS OF COUPLED OSCILLATORS APPLIED TO ANTENNA ARRAYS
Journal Title: ANALELE UNIVERSITATII DIN CRAIOVA - Seria Inginerie electrica - Year 2010, Vol 34, Issue 34
Abstract
In recent years microwave oscillators are widely studied. They are used to guide the radiation pattern of a phased array antenna in a certain direction instead of the traditional beam steering methods. These new control methods use the injection-locking phenomenon [1]. An array of coupled oscillators produces output signals with a certain phase distribution that steer the beam in a particular direction. Directing the beam with an angle θ requires a constant phase progression between the adjacent oscillators [4]. Theoretically, we can change the freer-running frequencies of the two outer oscillators of the network to get a phase progression range between -90° and 90°. This paper analyses two coupled oscillators through a resistive network. At first, their structures as well as their frequencies are identical. Then the frequencies are gradually changed in order to see the system’s ability to lock to a common frequency. Oscillators were analyzed using both PSpice and ADS (Advanced Design System) and we were able to obtain a desired phase-shift, but the maximum valued we reached for this phase shift was approximately 65°. Above these values, the oscillators are no longer capable to synchronize. The reliability of our results was tested both with Spice and ADS. Future work will be focused on increasing the values for the phase shift, which results in frequency locking.
Authors and Affiliations
Mihai IORDACHE, Jean-Marie PAILLOT, Iulia DUMITRESCU, Mihaela IONIŢĂ
Keywords
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