| Autor: |
Chiba, Isamu, Ohtsuka, Masataka, Matsumoto, Souichi, Katagi, Takashi |
| Předmět: |
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| Zdroj: |
Electronics & Communications in Japan, Part 1: Communications; Jun93, Vol. 76 Issue 6, p92-100, 9p |
| Abstrakt: |
When a circularly polarized phased array is used for communication, it is required to maintain a high gain and suppress the cross polarization over the beam scanning region and over the frequency region. However, in the traditional phase-setting method in which only the feed line length and the array factor are taken into consideration, the desired radiation characteristics cannot be obtained because the elemental electric field in the array environment is fluctuated by the effect of the mutual coupling between the elements and the scattered wave from the structures. In this paper, a method is presented for improving the gain and suppressing the cross-polarization level by controlling the excitation phase with the phase shifters Inherent to the phased array under these complex electromagnetic environments. The main idea of the present method is in the measurement of the correct and cross-polarization components for each element antenna and in the derivation of the optimum excitation phases basal on the minimization algorithm of the output power. An experiment is carried out in which the proposed method is compared with the phase-setting method where only the feed line length and the array factor are taken into account. Thus, the effectiveness of the proposed method is demonstrated. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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