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A beam-scanning and polarization-agile antenna array using mutually coupled oscillating doublers

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2 Author(s)
Shih-Chieh Yen ; Graduate Inst. of Commun. Eng., Nat. Taiwan Univ., Taipei, Taiwan ; Tah-Hsiung Chu

In this paper, a two-dimensional mutually coupled oscillator array is studied for the application of a beam-scanning and polarization-agile antenna array. In the design of antenna array, a two-dimensional oscillator array is implemented in x-y plane, the polarization agility is provided by one dimension (or y-direction) and the other dimension (or x-direction) is for beam scanning. By properly tuning the free-running frequencies of these oscillators, the array radiation direction can be scanned at the selected polarization states including linearly polarized, left-hand and right-hand circularly polarized states. The maximal phase difference of ±180° between coupled oscillating signals is acquired by utilizing their second-harmonic signals. This then gives well-defined phase differences among oscillators for beam scanning in addition to the required quadrature phase difference for circular polarization. The performances of polarization agility and beam scanning for a four-element antenna array are verified experimentally and shown to have the potential for adaptive antenna array applications.

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Antennas and Propagation, IEEE Transactions on  (Volume:53 ,  Issue: 12 )