Multimode Feed Horn Providing Multiphase Centres with Offset Reflector Antenna

Sharma, S.K.; Shafai, L.; Balaji, Bhashyam; Damini, Anthony; Haslam, G.

doi:10.1109/aps.2005.1552257

Cited by 10 publications

(9 citation statements)

References 5 publications

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“…By combining the TE 11 mode with either of the other two modes in varying amplitude and fixed phase, we can achieve beam scanning in only one plane [3][4] as pointed out earlier. Whereas by combining all the three modes simultaneously in proper amplitude and phase, we can obtain beam scan in both the φ = 0 ο and 90 ο cut planes.…”

Section: Theory and Design Of Waveguide Hornmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

“…A dual mode feedhorn is presented in [2][3] where TE 11 and TM 01 modes are excited to generate multiple phase centers when employed as a feed source for a reflector antenna. These papers [2][3] presented a technique of beam scanning in the φ = 90 ο cut plane only, thereby generation of multiple phase centers in the φ = 90 ο cut plane by control of the amplitude and phase of the modes. In [4] authors presented a tri-mode feedhorn design that employed TE 11 , TM 11 , and TE 21 modes, but the effort was to reduce the cross-polarization in the far-field pattern of a linearly polarized offset parabolic reflector antenna.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Investigations on a triple mode waveguide horn capable of providing scanned radiation patterns

Sharma

Tuteja

2010

2010 IEEE Antennas and Propagation Society International Symposium

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Section: Theory and Design Of Waveguide Hornmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Investigations on a triple mode waveguide horn capable of providing scanned radiation patterns

Sharma

Tuteja

2010

2010 IEEE Antennas and Propagation Society International Symposium

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“…Recently, the concept of virtual array antenna was studied in [3][4][5][6] with dual-mode waveguide antennas as primary feeds in reflector dishes. The virtual array antenna can be thought of as an antenna having multiple identical beams, with multiple displaced phase centre locations.…”

Section: Introductionmentioning

confidence: 99%

Virtual array antenna with displaced phase centers for GMTI applications

Pour

Shafai

Mehrabani

2011

2011 IEEE RadarCon (RADAR)

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A novel multi-phase center reflector antenna is introduced for the Ground Moving Target Indicator (GMTI) applications. A single antenna is used to virtually make it more than one antenna by controlling the excitation modes of the dual-mode primary feed. First, the multi-mode primary feed is analytically modeled to study the concept in general. Then, the results are presented for the dual-mode stacked circular microstrip patch antenna placed at the focal point of an offset reflector antenna.

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“…The use of multimode horns in reflector antennas was discussed in [1]- [3] where it was shown that the excitation of tracking modes can generate multiple phase centers. The designs of such dedicated multimode horns were investigated in [4], [5]. This paper concentrates on the concept of generating multiple phase centers with reflector antennas, and investigates their performance in sidelobes and cross polarization.…”

mentioning

confidence: 99%

Multiple Phase Center Performance of Reflector Antennas Using a Dual Mode Horn

Shafai

Sharma

Balaji

et al. 2006

IEEE Trans. Antennas Propagat.

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A new application for reflector antennas is proposed and developed. Using the aperture theory, a phase center on the reflector aperture is determined and shown that, its location is dependent on the field distribution. The proposed concept is, initially, verified by using a symmetric reflector. It is shown that the phase center is located at the aperture geometric center, when the reflector is illuminated symmetrically about its principal planes.Then, a dual mode feed, employing TE 11 and TM 01 modes, is used for generating different reflector illuminations, and causing displacement of its phase center. The concept is then extended to offset reflectors, and the influence of the reflector geometry on the phase center displacement and other reflector electrical parameters is investigated. Based on the established feed radiation pattern requirements, a feed horn is designed using circular waveguide that can propagate both modes. By modifying the amplitude and phase of the modes in the horn, a controlled asymmetric reflector aperture field is achieved. A prototype feed horn is fabricated and tested for its dual mode radiation patterns. The results are in good agreement with simulations. The reflector phase center properties are then investigated, by using the designed feed. A reflector-feed assembly, with its dual phase center capability, was developed for improving the performance of the ground moving target indicator radars. The concept allows the conversion of a single reflector to two or more reflectors, simply by modifying the mode excitation amplitudes and phases, in the feed alone.Index Terms-Beam shift, dual mode, feed horn, ground moving target indicator (GMTI) radar, multiple phase center, reflector antenna.

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Multimode Feed Horn Providing Multiphase Centres with Offset Reflector Antenna

Cited by 10 publications

References 5 publications

Investigations on a triple mode waveguide horn capable of providing scanned radiation patterns

Investigations on a triple mode waveguide horn capable of providing scanned radiation patterns

Virtual array antenna with displaced phase centers for GMTI applications

Multiple Phase Center Performance of Reflector Antennas Using a Dual Mode Horn

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