Research of a flat in phase two-dimensional-periodic overrange antenna array of flared notch hornes

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Abstract

Using numerical modeling, a study was carried out of the matching and radiation characteristics of a flat in-phase two-dimensional - periodic over-band antenna array of flared-notch horns depending on the period and length of the array elements, input and output impedance, type of feed lines and screen shape. A 64-way power divider with outputs in the form of symmetrical two- strip lines has been developed and studied, and an 8 × 8 array of elements with a power divider as a power feed system has been studied. It is shown that the array with the U-shaped screen provides an operating frequency bandwidth of more than 20:1.

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About the authors

M. D. Duplenkova

Kotelnikov Institute of Radio Engineering and Electronics of RAS

Email: vak@cplire.ru
Russian Federation, Mokhovaya Str., 11, build. 7, Moscow, 125007

V. A. Kaloshin

Kotelnikov Institute of Radio Engineering and Electronics of RAS

Author for correspondence.
Email: vak@cplire.ru
Russian Federation, Mokhovaya Str., 11, build. 7, Moscow, 125007

The Thanh Nguyen

Moscow Institute of Physics and Technology (National Research University)

Email: vak@cplire.ru
Russian Federation, Institutsky per., 9, Dolgoprudny, Moscow region, 141700

References

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Supplementary files

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2. Fig. 1. Floquet channel for a phased array of slot horns: isometric view (a) and cross-section (b).

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3. Fig. 2. Frequency dependence of the reflection coefficient of infinite gratings for the model shown in Fig. 1: with a period of 15 mm × 15 mm and an input resistance of 50 Ohm (curve 1) and 100 Ohm (curve 3); with a period of 10 mm × 15 mm and an input resistance of 50 Ohm (curve 2) and 100 Ohm (curve 4).

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4. Fig. 3. Infinite lattice model, lumped port excitation.

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5. Fig. 4. Frequency dependence of the reflection coefficient of infinite gratings for the model shown in Fig. 3: with a period of 15 mm × 15 mm and an input resistance of 50 Ohm (curve 1) and 100 Ohm (curve 3); with a period of 10 mm × 15 mm and an input resistance of 50 Ohm (curve 2) and 100 Ohm (curve 4).

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6. Fig. 5. Frequency dependence of the reflection coefficient of an infinite grating for L = 100 (1), 150 (2), 200 (3) mm.

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7. Fig. 6. 256-element in-phase antenna array: (a) – with a flat screen, (b) – with a U-shaped screen.

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8. Fig. 7. Frequency dependence of the reflection coefficient for gratings with a period of 15×15 mm and a flat screen (a), a U-shaped screen (b). Curves 1–4 correspond to the number of grating elements: 64, 144, 256, ∞. The input resistance in all cases is 50 Ohm.

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9. Fig. 8. Frequency dependence of the reflection coefficient for gratings with 64 elements and a flat screen (a), and a U-shaped screen (b). Curves 1 and 3 correspond to a grating period of 15 mm × 15 mm and an input resistance of 50 and 100 Ohms; curves 2 and 4 correspond to a grating period of 15 mm × 15 mm and an input resistance of 50 and 100 Ohms.

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10. Fig. 9. Frequency dependence of the reflection coefficient for gratings with 64 elements with a period of 15 mm × 15 mm and a flat screen (a), a U-shaped screen (b) with different element lengths L: 100 (1), 150 (2) and 200 mm (3).

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11. Fig. 10. Directional patterns of a 64-element in-phase array with a flat screen in the E-plane (a) and H-plane (b) at frequencies of 0.5 (1), 5 (2), 9 (3) and 11 (4) GHz.

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12. Fig. 11. Directional patterns of a 64-element in-phase array with a U-shaped screen in the E-plane (a) and H-plane (b) at frequencies of 0.5 (1), 5 (2), 9 (3) and 11 (4) GHz.

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13. Fig. 12. Directional patterns of a 256-element in-phase array with a flat screen in the E-plane (a) and H-plane (b) at frequencies of 0.5 (1), 5 (2), 9 (3) and 11 (4) GHz.

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14. Fig. 13. Directional patterns of a 256-element in-phase array with a U-shaped screen in the E-plane (a) and H-plane (b) at frequencies of 0.5 (1), 5 (2), 9 (3) and 11 (4) GHz.

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15. Fig. 14. Frequency dependences of the gain of a 64-element (curves 1, 2) and 256-element in-phase array (curves 3, 4) with different screens. Curves 1, 3 correspond to a U-shaped screen, and curves 2, 4 – to a flat screen.

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16. Fig. 15. Frequency dependences of the forward-to-backward radiation ratio of a 64-element (curves 1, 2) and 256-element in-phase array (curves 3, 4) with different screens. Curves 1, 3 correspond to a U-shaped screen, and curves 2, 4 to a flat screen.

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17. Fig. 16. Antenna array with a divider: (a) – with a flat screen, (b) – with a U-shaped screen.

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18. Fig. 17. Coaxial power divider; top – longitudinal section, bottom – diagram.

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19. Fig. 18. Strip power divider; top – longitudinal section, bottom – diagram.

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20. Fig. 19. Frequency dependence of the divider reflection coefficient calculated using FEM (1) and MKRVO (2).

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21. Fig. 20. Frequency dependence of the power divider gain: outputs 1–8 (a), outputs 9–16 (b), outputs 17–24 (c), outputs 25–32 (d). Curves 1: outputs 1, 9, 17, 25; curves 2: outputs 2, 10, 18, 26; curves 3: outputs 3, 11, 19, 27; curves 4: outputs 4, 12, 20, 28; curves 5: outputs 5, 13, 21, 29; curves 6: outputs 6, 14, 22, 30; curves 7: outputs 7, 15, 23, 31; curves 8: outputs 8, 16, 24, 32.

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22. Fig. 21. Frequency dependence of the phases of the divider gain coefficients: outputs 1–8 (a), outputs 9–16 (b), outputs 17–24 (c), outputs 25–32 (d). Curves 1: outputs 1, 9, 17, 25; curves 2: outputs 2, 10, 18, 26; curves 3: outputs 3, 11, 19, 27; curves 4: outputs 4, 12, 20, 28; curves 5: outputs 5, 13, 21, 29; curves 6: outputs 6, 14, 22, 30; curves 7: outputs 7, 15, 23, 31; curves 8: outputs 8, 16, 24, 32.

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23. Fig. 22. Power supply system output diagram.

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24. Fig. 23. Frequency dependence of the reflection coefficient of a grating with a divider and: a U-shaped screen (1), a flat screen (2), without a screen (3).

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25. Fig. 24. Smooth transition from strip line to slot horn.

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26. Fig. 25. Frequency dependence of the reflection coefficient of a grating with a U-shaped screen and smooth transitions: without a divider (1), with a divider (2).

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27. Fig. 26. Directivity patterns of an antenna array with a U-shaped screen in the E-plane (a) and H-plane (b) at frequencies of 0.5 (1), 5 (2), 9 (3) and 11 (4) GHz.

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28. Fig. 27. Directivity patterns of an antenna array with a flat screen in the E-plane (a) and H-plane (b) at frequencies of 0.5 (1), 5 (2), 9 (3) and 11 (4) GHz.

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29. Fig. 28. Frequency dependences of the gain (curves 1, 2) and the forward-to-backward radiation ratio (curves 3, 4) of a 64-element in-phase antenna array. Curves 1, 3 correspond to a U-shaped screen, curves 2, 4 – to a flat screen.

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