A Tri-mode Horn Feed for Gravitationally Balanced Back-to-Back Reflector Antennas

Bahadori, K.; Rahmat‐Samii, Y.

doi:10.1109/aps.2006.1711608

Cited by 16 publications

(3 citation statements)

References 6 publications

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“…Feeds of this particular design can typically provide a cross-pol response of or lower for a bandwidth of a bit more than 250 MHz at 10 GHz [16] which is sufficient for many remote sensing applications. A number of techniques can be also applied to improve the bandwidth of the feeds.…”

Section: Focal Point Tri-mode Matched Horn Feedsmentioning

confidence: 99%

Back-to-Back Reflector Antennas With Reduced Moment of Inertia for Spacecraft Spinning Platforms

Bahadori

Rahmat‐Samii

2007

IEEE Trans. Antennas Propagat.

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A back-to-back reflector antenna system with reduced moment of inertia is proposed in order to address the demanding problem of supporting large reflector antennas on spinning platforms. The configuration provides additional potential advantages, such as reducing the spinning speed by half for a given sampling rate when both back-to-back reflectors are utilized. Geometrical parameters of the reflector are determined such that the moment of inertia of the rotating system is reduced. It is shown that these back-to-back reflectors suffer from a high cross-pol level in the asymmetrical plane due to the large feed offset angle. Two different methods are explored to alleviate the high cross-pol level problem. In the first method, a sub reflector is utilized to minimize the cross-pol level by satisfying the Mizugutchi condition. In the second method, a tri-mode matched feed horn is suggested to achieve a similar result. The suppressed cross-pol level puts forward the gravitationally balanced back-to-back reflector antenna systems as a potential candidate for future spacecraft antennas on spinning platforms.

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Section: Focal Point Tri-mode Matched Horn Feedsmentioning

confidence: 99%

Back-to-Back Reflector Antennas With Reduced Moment of Inertia for Spacecraft Spinning Platforms

Bahadori

Rahmat‐Samii

2007

IEEE Trans. Antennas Propagat.

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“…In [12], it is shown that the matched feed horns provide significant improvement in cross polarization as compared to a dual-mode potter horn. In a recent paper [13], the matched feed has been used to illuminate the gravitationally balanced back-to-back reflector. To the best of authors' knowledge, no data on beam efficiency improvement using the tri-mode matched feed has been reported in the open literature.…”

Section: Introductionmentioning

confidence: 99%

Improving the Beam Efficiency of an Offset Parabolic Reflector Antenna for Spaceborne Radiometric Applications

Pujara¹,

Sharma²,

Chakrabarty³

2009

PIER C

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Abstract-This paper presents a novel technique to improve the crosspolarization and the beam efficiency of an offset parabolic reflector antenna used for space borne radiometric applications. A special multi-mode primary feed (tri-mode conjugate matched feed) is used to illuminate the offset parabolic reflector antenna. The simulated data on the radiation characteristics of the offset parabolic reflector antenna with a matched feed has been compared with that of a conventional Potter horn. It is observed that the tri-mode feed suppress the unwanted high cross-polarization of an offset reflector antenna and improves the beam efficiency.

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“…In a recent paper [8], the linearly polarized matched feed has been used to illuminate the gravitationally balanced backto-back reflectors. The performance comparison of a matched feed illuminated offset reflector with a conventional potter horn fed offset parabolic reflector is found in [9].…”

Section: Introductionmentioning

confidence: 99%

Removal of Beam Squinting Effects in a Circularly Polarized Offset Parabolic Reflector Antenna Using a Matched Feed

Sharma¹,

Pujara²,

Chakrabarty³

et al. 2009

PIER Letters

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Abstract-This paper presents the design of a tri-mode matched feed horn to remove the beam squinting effects in a circularly polarized offset parabolic reflector antenna. In a conical horn, three modes i.e., TE 11 , TM 11 and TE 21 are combined in proper amplitude and phase proportion to obtain a tri-mode matched feed configuration. The proposed tri-mode horn is then used as a primary feed device to illuminate the circularly polarized offset parabolic reflector antenna. The simulated data on radiation characteristics of the offset reflector are used to estimate the magnitude of beam squinting and the results are compared with that of a conventional potter horn fed offset reflector. The experimental results on secondary radiation pattern are also incorporated in the paper.

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A Tri-mode Horn Feed for Gravitationally Balanced Back-to-Back Reflector Antennas

Cited by 16 publications

References 6 publications

Back-to-Back Reflector Antennas With Reduced Moment of Inertia for Spacecraft Spinning Platforms

Back-to-Back Reflector Antennas With Reduced Moment of Inertia for Spacecraft Spinning Platforms

Improving the Beam Efficiency of an Offset Parabolic Reflector Antenna for Spaceborne Radiometric Applications

Removal of Beam Squinting Effects in a Circularly Polarized Offset Parabolic Reflector Antenna Using a Matched Feed

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