Beam forming network on the base of non-identically coupled transmission lines

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Abstract

Beam forming network as a system of parallel coupled transmission lines with different coupling coefficients is proposed. The beam forming network feeds linear array that in its turn forms radiation pattern with sector shape. An eigenwave problem for an infinite system of infinite transmission lines is solved in frame of coupled wave theory. Also a problem of eigenwave excitation is solved in frame of the same theory. Relations describing wave amplitudes in output plane are obtained. Directivity multiplier of a linear radiating array that excited by the waves in the output plane is considered. The analysis demonstrates that application of new type beam forming network sufficiently improves radiation pattern shape in compare with radiation pattern of the array with beam forming network with identically coupled transmission lines.

About the authors

S. Е. Bankov

Kotel’nikov Institute of Radioengeneering and Electronics RAS

Author for correspondence.
Email: sbanlkov@yandex.ru
Russian Federation, Mokhovaya St., 11, build. 7, Moscow, 125009

References

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2. Fig. 1. The structure under study.

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3. Fig. 2. The SLP system.

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4. Fig. 3. Excitation of the SLP system.

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5. Fig. 4. Distribution of wave amplitudes in the DOS channels.

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6. Fig. 5. Determination of quality indicators.

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7. Fig. 6. Dependence of the UBL on the dimensionless coupling coefficient .

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8. Fig. 7. Dependence of the main beam half-width on the dimensionless coupling coefficient .

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9. Fig. 8. Dependence of the steepness of the slope of the directivity multiplier S on the dimensionless coupling coefficient .

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10. Fig. 9. Dependence of the UBL on the parameter b.

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11. Fig. 10. Dependence of the main beam half-width on the parameter b.

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12. Fig. 11. Dependence of the steepness of the slope of the directivity multiplier S on the parameter b.

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13. Fig. 12. Dependence of the UBL on the dimensionless period of the grating.

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14. Fig. 13. Dependence of the main beam half-width on the dimensionless period factor .

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15. Fig. 14. Dependence of the steepness of the slope of the directivity multiplier S on the dimensionless period factor .

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16. Fig. 15: Directivity multipliers of the DOS with unequal (1) and equal (2) links and staggered single stage DOS (3).

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17. Fig. 16. Utilization factor of the grating element.

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