Analytical Models of Dual-Polarized Primary Matched Feeds for Offset Reflector Antennas With Low Cross-Polarization Properties at Both Asymmetry and Diagonal Planes

Pour, Z. Allahgholi; Shafai, L.

doi:10.1109/tap.2016.2537361

Cited by 14 publications

(5 citation statements)

References 15 publications

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“…Comparisons among recently reported low XP antennae are shown in Table 2. Compared with other reflector antennas reported in Bahadori and colleagues, 11,12,17,18 it can be seen that the proposed reflector antenna exhibits an ultralow XP of about −40 dB. Although a slotted or substrate‐integrated waveguide antenna 19,20 can achieve better XP performance, it is difficult to employ in multibeam antenna system.…”

Section: Simulation and Test Resultsmentioning

confidence: 82%

“…However, the asymmetry of reflector structure itself leads to the deterioration of cross-polarization (XP) and the value is generally about −25 dB, 4,5 which does not meet the high requirement in some special system. To improve the XP performance, the common scheme is (1) increasing the focal length to weaken the effect of the asymmetry on the XP performance 6,7 ; (2) reshaping the surface of the reflector to change the amplitude and phase distribution of surface field, then to improve the XP performance 8,9 ; (3) redesigning the feed to let it operate at the multimode state to improve the XP performance [10][11][12] ; (4) using dualreflector to suppress the XP performance. 13 However, increasing the focal length will be limited by the satellite structure, and the improvement effect is extremely limited.…”

Section: Introductionmentioning

confidence: 99%

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Design of multibeam antenna with ultralow cross‐polarization

Tao,

Wang,

Wan

et al. 2024

Micro & Optical Tech Letters

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This paper presents a design to realize extremely low cross‐polarization level in multibeam antenna. The antenna consists of two reflectors placed on top of each other. The front reflector is a panel made of metal grid, which is used to separate two orthogonal polarizations. The rear reflector serves as the actual multibeam antenna surface. The multibeam antenna and feed array operated at Ku band are designed and fabricated. The test results show that the gains of the 28 beams can be better than 40.42 dBi, and the cross‐polarization level can be lower than −40 dB. The proposed method provides a novel idea for the design of ultralow cross‐polarization multibeam antenna.

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Section: Simulation and Test Resultsmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Design of multibeam antenna with ultralow cross‐polarization

Tao,

Wang,

Wan

et al. 2024

Micro & Optical Tech Letters

View full text Add to dashboard Cite

show abstract

“…Multimode waveguide horns are generally used as matched feed for reducing cross‐polar radiation in offset reflectors. Higher order modes along with the dominant mode are generated with proper excitation coefficients in horns to tackle the cross‐polarization problem …”

Section: Introductionmentioning

confidence: 99%

“…Higher order modes along with the dominant mode are generated with proper excitation coefficients in horns to tackle the cross-polarization problem. [3][4][5][6][7][8][9][10][11][12]…”

Section: Introductionmentioning

confidence: 99%

Microstrip patch antenna feed for offset reflector antenna for dual band application

Debbarma

Bhattacharjee

2019

Int J RF Microw Comput Aided Eng

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In this article, details of a dual band microstrip patch antenna (MPA) array feed for an offset reflector antenna is presented. The main objective of the proposed structure is to achieve low cross‐polarization at Φ = 90° plane in the reflector pattern. Low cross‐polar levels in the reflector pattern are achieved by illuminating the reflector with fields of the proposed dual band feed structure. A centered circular array as the dual band feed structure is proposed in which the central radiating element is a dual mode circular MPA operating at 6 GHz and the surrounding circular ring of eight circular MPA elements operating at 4 GHz in the dominant mode. The dual mode central antenna uses the concept of conjugate field matching for cross‐polarization reduction. TM21 mode is excited at an appropriate ratio with the TM11 mode to achieve the proper field matching at 6 GHz. The radius of the surrounding circular array is varied to obtain cross‐polarization better than −30 dB at both the resonant frequencies. The offset reflector gain is found to be better than 37 dB with a 2.5 m parabolic reflector and F/D = 0.8 at both the operating frequencies.

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“…This asymmetric field can be compensated by addition of higher order modes with similar field distribution in appropriate ratio along with the dominant mode in the reflector feed . Dual‐mode horn antenna feed for the offset reflector uses the concept of CFM to achieve low level of cross‐polarization . In traditional dual‐mode circular horn antenna feed, TE 21 mode is generated at a suitable ratio to the dominant TE 11 mode for CFM.…”

Section: Introductionmentioning

confidence: 99%

Matched feeds for offset reflector antenna using circular microstrip patch antenna

Debbarma

Bhattacharjee

2019

Int J RF Microw Comput Aided Eng

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This article presents two designs of matched feed for an offset fed reflector. Circular microstrip patch antennas are used in the proposed designs. Both the matched feeds achieve conjugate field matching by generating TM 21 mode at an appropriate ratio to the fundamental TM 11 mode. The first matched feed generates the required dual mode field distributions using a dual layer stacked patch antenna. The second matched feed is a novel design using centered circular array with the central element generating the required TM 21 mode and the surrounding circular ring antenna elements operating in the TM 11 mode. Both the designs are studied analytically using cavity model and are implemented in High frequency System Simulator (HFSS) and Computer Simulation Technology (CST). The matched feed designs are investigated for an offset reflector with the projected diameter, D = 50λ, focal length, F = 30λ and clearance height, H = 5λ operating at 20 GHz. The secondary field patterns of the offset reflector fed by the matched feeds are evaluated numerically using a MATLAB code based on geometrical optics technique and verified by HFSS-PO results. Offset reflector performance such as cross-polarization, −30 dB cross-polar bandwidth, gain, and first side-lobe level are investigated for the both matched feeds. K E Y W O R D S centered circular arrays, cross-polarization, matched feed, offset reflector antennas

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Analytical Models of Dual-Polarized Primary Matched Feeds for Offset Reflector Antennas With Low Cross-Polarization Properties at Both Asymmetry and Diagonal Planes

Cited by 14 publications

References 15 publications

Design of multibeam antenna with ultralow cross‐polarization

Design of multibeam antenna with ultralow cross‐polarization

Microstrip patch antenna feed for offset reflector antenna for dual band application

Matched feeds for offset reflector antenna using circular microstrip patch antenna

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