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Beam Steering in Circular Planar Array of Coupled Microwave Oscillators

Tooni, Sakineh | 2009

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 39871 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Banai, Ali
  7. Abstract:
  8. In this thesis, it is shown that by detuning the array peripheral elements, without using phase shifters, and locking the array to the common frequency there exists a phase difference between two adjacent elements which is constant along the array and is proportional to the amount of free running frequency detuning. By changing free running frequency and therefore resultant phase difference, one can control the array beam direction. Linear, ring, hexagonal and triangular array configurations have been analyzed so far. In this work we endeavor to explore a circular planar array with weak coupling. The aim is to yield an analytical relationship to determine the free running frequency of each element on the circumference of the array in order to have desired beam axis direction and beam width, and low side lobe level after locking the array and the validation of the relations is confirmed by simulation. Several types of free running frequency distribution functions for detuning the peripheral elements are proposed and their features are compared with each other. It is found that for sinusoidal case the amount of beam axis rotation can be calculated by the formula which is used in square array with the same amount of elements while circular array proposes lower side lobe levels than the square array.




  9. Keywords:
  10. Green Function ; Inter Injection Locking ; Oscillator Array ; Synchronized Oscillator ; Beam Steering

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