Some important geometrical features of conic-section-generated offset refelector antennas

Jamnejad-Dailami, V.; Rahmat‐Samii, Y.

doi:10.1109/tap.1980.1142428

Cited by 27 publications

(6 citation statements)

References 4 publications

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“…Therefore, in order to establish a connection between the roughness and radiating slot error, the key difficulty lies in antenna error analysis. Based on the model f(x, y), the roughness information should be primarily represented using antenna coordinates [30]. Given a point on the roughness surface A(x A , y A , z A ) and an angle a, an elliptical curve can be obtained using a line drawn through the point A, whose axis is the origin and a is the angle.…”

Section: Factors Affecting Roughnessmentioning

confidence: 99%

Effect of Surface Roughness in Micro-nano Scale on Slotted Waveguide Arrays in Ku-band

Song

2017

Chin. J. Mech. Eng.

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Modeling of the roughness in micro-nano scale and its influence have not been fully investigated, however the roughness will cause amplitude and phase errors of the radiating slot, and decrease the precision and efficiency of the SWA in Ku-band. Firstly, the roughness is simulated using the electromechanical coupled(EC) model. The relationship between roughness and the antenna's radiation properties is obtained. For verification, an antenna prototype is manufactured and tested, and the simulation method is introduced. According to the prototype, a contrasting experiment dealing with the flatness of the radiating plane is conducted to test the simulation method. The advantage of the EC model is validated by comparisons of the EC model and two classical roughness models (sine wave and fractal function), which shows that the EC model gives a more accurate description model for roughness, the maximum error is 13%. The existence of roughness strongly broadens the beamwidth and raises the side-lobe level of SWA, which is 1.2 times greater than the ideal antenna. In addition, effect of the EC model's evaluation indices is investigated, the most affected scale of the roughness is found, which is 1/10 of the working wavelength. The proposed research provides the instruction for antenna designing and manufacturing.

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Section: Factors Affecting Roughnessmentioning

confidence: 99%

Effect of Surface Roughness in Micro-nano Scale on Slotted Waveguide Arrays in Ku-band

Song

2017

Chin. J. Mech. Eng.

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“…1. The reflector is a standard conic-section-generated offset parabolic reflector with a circular projected aperture [10]. The diameter of the projected aperture is , the focal length is , and the offset height is .…”

Section: The Simple Formulamentioning

confidence: 99%

“…It is a good approximation considering the squint angle usually is very small and consequently is small, too. Combining (7) and (8), the formula to estimate the optimal feed displacement can be expressed as (10) Although it is derived based on a single offset parabolic reflector antenna with an on-focus feed, the formula (10) can also be applied to other configurations. For example, when a single offset parabolic reflector antenna with an off-focus feed is considered, (2) instead of (1) should be used to predict the beam squint.…”

Section: The Simple Formulamentioning

confidence: 99%

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A Novel Beam Squint Compensation Technique for Circularly Polarized Conic-Section Reflector Antennas

Rahmat‐Samii

2010

IEEE Trans. Antennas Propagat.

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Beam squint generally exists in offset reflector antennas with circularly polarized feeds. It is manifested by a small beam shift of the radiation pattern in the plane perpendicular to the principal offset plane, which can significantly affect the beam pointing accuracy. In this paper a practical and widely applicable compensation technique for the beam squint is proposed. Simulation results show that a small lateral feed displacement in the perpendicular plane can effectively minimize or eliminate the linear phase shift caused by the depolarization effect, thus compensating for the beam squint effect. This is in practice very useful for offset reflector antennas where the previously suggested method based on feed tilting may not be proper. A simple formula is derived to quickly estimate the optimal feed displacement for both right-and left-hand circularly polarized feeds. Three representative examples: a single offset parabolic reflector, a suboptimal offset Cassegrain reflector, and an axially symmetric Cassegrain reflector with an off-focus feed, are presented to validate the proposed method. Satisfactory results are achieved for all three examples.

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“…The proposed antenna develops from the U-shaped cross-sectional antenna which typically it is used as an indoor antenna. By installing it with the offset parabolic reflector [3], many good characteristics antenna are achieved. The offset parabolic reflector is used for reflecting and concentrating an electromagnetic wave to the antenna.…”

Section: Introductionmentioning

confidence: 99%

A U-Shaped cross sectional antenna on a U-shaped ground plane with an offset parabolic reflector for WLAN

Thongsopa

Srimoon

Jarataku

2007

2007 IEEE Antennas and Propagation Society International Symposium

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Some important geometrical features of conic-section-generated offset refelector antennas

Cited by 27 publications

References 4 publications

Effect of Surface Roughness in Micro-nano Scale on Slotted Waveguide Arrays in Ku-band

Effect of Surface Roughness in Micro-nano Scale on Slotted Waveguide Arrays in Ku-band

A Novel Beam Squint Compensation Technique for Circularly Polarized Conic-Section Reflector Antennas

A U-Shaped cross sectional antenna on a U-shaped ground plane with an offset parabolic reflector for WLAN

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