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Appendix 3 – Antenna Gain Model Parameters

Lecture



Table A3.1 - Approximating expressions for the main lobe of the radiation pattern

Approximating expression

Note

G(ψ )=G0 for {-0,5α0 ≤ ψ≤ 0,5α0 }

0 for other values of ψ

ψ - the angle in the plane to which the approximation applies (θ or φ);

α0 - the width of the main lobe of the radiation pattern in the approximation plane at the -3 dB level (Δθ0,5 or Δφ0,5)

G(ψ )=G0sin2(2,81ψ/α0 )/(2,81ψ/α0 )2

G(ψ )=G0cos4(1,14ψ/α0 )

G(ψ )=G0exp{-2,78(ψ/α0 )2}

Table A3.2 - Antenna gain model parameters in the main lobe region

Antenna parameters

Specified conditions

θ

φ

D, dB

σG, dB

Frequency

Polarization

G0 ≤10 dB

Within the operating band

Primary

Δθ0,5

Δφ0,5

0

1

Orthogonal

6Δθ0,5

6Δφ0,5

0

2

Outside the operating band

Arbitrary

3600

1800

-G0

2

10dB<G0≤25dB

Within the operating band

Primary

Δθ0,5

Δφ0,5

0

2

Orthogonal

10Δθ0,5

10Δφ0,5

-20

3

G0 > 25 dB

Within the operating band

Primary

Δθ0,5

Δφ0,5

0

2

Orthogonal

10Δθ0,5

10Δφ0,5

0

3

Outside the operating band

Arbitrary

4Δθ0,5

4Δφ0,5

-13

3

Resonant

Outside the operating band

Arbitrary

3Δθ0,5

3Δφ0,5

-10

3

Non-resonant

Arbitrary

Δθ0,5

Δφ0,5

0

3

Table A3.3 – Effect of aperture blockage on the sidelobe level of the radiation pattern

Δ

Relative shadowed area

σ1

σ2

σ3

0,316

0

- 22,4

- 29,3

-33,8

0,1

- 20,6

-34,6

- 28,8

0,2

-16,7

–

- 21,3

0

0

- 24,6

-33,6

-39,7

0,1

- 22,0

–

-30,2

0,2

-16,5

–

- 20,2

Table A3.4 - Parameters of antenna sidelobe gain distributions

Antenna type

Frequency

Polarization

Gavg, dB

σG, dB

G0>25 dB

Operating

Operating

Orthogonal

-10

-10

14

14

Spurious

Any

-10

14

10≤G0<25 dB

Operating

Operating

Orthogonal

-10

-20

11

13

Spurious

Any

-10

10

G0<10 dB

Operating

Operating

Orthogonal

0

-13

6

8

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Lectures and tutorial on "Electromagnetic compatibility"

Terms: Electromagnetic compatibility

1. The Electromagnetic Environment in a Group of Equipment 1.1. Causes of the EMC Problem
Antenna effect - antenna effect
1.2 Basic Concepts and Definitions of EMC
1.3 The problem of electromagnetic compatibility (EMC) and methods of its solution, shielding, screens
1.4 Sources and receptors of electromagnetic (EM) interference
Models of a Radio-Electronic System and EMC Assessment
3. Radio transmitters as sources of interference
4. Models of the spectrum envelope and radiation parameters of a radio transmitter
5. Characteristics of antenna devices and their effect on EMC
6. Methods of Spatial Propagation of Interference
7. Radio receivers as interference receptors
8. Analysis of the EME. Models and Methods for EMC Assessment
9. Assessment9. Stage-by-Stage Assessment of Electromagnetic Compatibility, Analysis of Hazardous Interference Sources, Analysis of Hazardous Interference Sources
10. Measurement of spurious emission parameters
11. Measurement of susceptibility parameters
Appendix 1 – Classification of emissions
Appendix 2 – Parameters of Power Spectrum Approximation Models
Appendix 3 – Antenna Gain Model Parameters
Appendix 4 – Radio Wave Propagation Curves
Appendix 5 – EMC Criteria Recommended by the ITU for Basic Radio Services
Electromagnetic radiation in a jet engine: nature, mitigation, application