TE /sub 11/ to HE /sub11/ Cylindrical Waveguide Mode Converters Using Ring-Loaded Slots

James, G.L.; Thomas, B.

doi:10.1109/tmtt.1982.1131062

Cited by 51 publications

(17 citation statements)

References 4 publications

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“…2) a length between 600-700 mm where the shorter length favours the corrugated horn design; 3) the horn to be used as a feed on a Cassegrain-type antenna where the half-angle from the focus to the edge of the subreflector has a typical value of ; 4) a frequency-dependent Gaussian-shaped radiation pattern (as in [4]) with a taper at 20 at the lowest frequency (3.4 GHz) and varying with increasing frequency to reach at 15 for the highest operating frequency (6.725 GHz). To calculate the radiation pattern, we use the proven accurate mode-matching method [6], [7]. Furthermore, since the application is wideband, any corrugated horn design will require a ring-loaded slot mode-converter [1], [7] in order to maintain high-performance over the 2:1 frequency band.…”

Section: Horn Optimizationmentioning

confidence: 99%

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Spline-Profile Smooth-Walled C-Band Horn

Granet

James

2007

Antennas Wirel. Propag. Lett.

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A smooth-walled spline-profile horn is optimized to cover the extended C-band satellite communication frequency band. This band is usually covered by a corrugated horn but the smooth-walled design presented here offers an economical and high-performance alternative. We compare the relative behavior between a corrugated horn and a smooth-walled horn feeding an 11-m-diameter-shaped Cassegrain Earth station antenna.

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Section: Horn Optimizationmentioning

confidence: 99%

“…To calculate the radiation pattern, we use the proven accurate mode-matching method [6], [7]. Furthermore, since the application is wideband, any corrugated horn design will require a ring-loaded slot mode-converter [1], [7] in order to maintain high-performance over the 2:1 frequency band.…”

Section: Horn Optimizationmentioning

confidence: 99%

Spline-Profile Smooth-Walled C-Band Horn

Granet

James

2007

Antennas Wirel. Propag. Lett.

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“…In a typical conical corrugated horn, there are five to ten slots per wavelength, the slot width-to-pitch ratio (w /p) is >0. 75, and the slot depth is approximately [19] …”

Section: Corrugated Hornsmentioning

confidence: 99%

“…These slots present a capacitive reactance over a considerably wider bandwidth than that of a conventional constant width slot. The design of ring-loaded slots is described by James and Thomas [19]. The final part of the design is tapering the profile from the initial transition to the final output diameter.…”

Section: Corrugated Hornsmentioning

confidence: 99%

Feed Antennas

Bird

2007

Modern Antenna Handbook

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“…The dual frequency horn will receive X-band (8.4-8.5 GHz), KABLE frequency (33.6-33.8 GHz), and DSN Ka-band downlink (31.8-32. 3 GHz) signals simultaneously. The horn is designed to receive circularly polarized waves.…”

Section: Introductionmentioning

confidence: 99%

X/Ka-band dual frequency horn design

Chen

Stanton

Proceedings of IEEE Antennas and Propagation Society International Symposium and URSI National Radio Science Meeting

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IntroductionThe Deep Space Network has a need for a dual frequency horn for simultaneous dual frequency operation in a beam waveguide antenna. The dual frequency horn will receive X-band (8.4-8.5 GHz), KABLE frequency (33.6-33.8 GHz), and DSN Ka-band downlink (31.8-32.3 GHz) signals simultaneously. The horn is designed to receive circularly polarized waves. Low loss (noise) in the dual frequency horn is a prime consideration since the horn is employed in the reception of signals from deep space. Analysis and DesignThe geometry of the dual Frequency horn is a disk-on-rod inside a common aperture horn (Figure 1). The X-band signal is guided by the corrugated horn, then enters the four X-band ports. The X-band junction consists of four rectangular ports intersecting a cylinder. Two X-band ports are located 180 degrees apart in order to cancel out the higher order modes generated at this junction. A second pair of ports, located 90 degrees with respect to the first pair of ports, are necessary for circular polarization [l]. The Ka-band signal is guided by the cormgated horn then captured by the disk-on-rod, which guides the signal passing the X-band junction for high isolation. Since the disk-on-rod is lossy, it should be as short as possible, yet long enough to make the Ka-band signal travel past the X-band ports. The disk-on-rod ends in a straight corrugated circular waveguide section in order to prevent the generation of higher order modes at Kaband. The disk-on-rod is designed to be electromagnetically invisible to the Xband.The disk-on-rod inside a corrugated horn is considered as a series of coaxial waveguide sections and circular waveguide sections. The junctions between these waveguide sections are classified in the following three categories : coaxial-tocoaxial, coaxial-to-circular (or circular-to-coaxial), and circular-to-circular waveguide junctions. The electromagnetic field is represented by coaxial waveguide modes in the coaxial region and circular waveguide modes in the 0-7803-2009-3/94/$4.00 0 1994 IEEE. 990 circular waveguide region. By applying the mode matching method at the junctions, the scattering matrix of a disk-on-rod inside a cormgated horn may be achieved [Z-31. A computer program was developed based on the mode matching method to calculate the scattering matrix. Then the radiation pattern was achieved from the modes at the horn aperture. The radiation pattems of X-band and Kaband are shown in Figures 2 and 3 respectively.The radiation patterns of the dual Frequency hom then are run through the DSS-13 beam waveguide system using Physical Optics analysis. The beam waveguide antenna includes three curved mirrors, three flat mirrors, a main reflector and a subreflector. The G/T values of the dual frequency system in the beam waveguide antenna are better than the G/T value using two horns and a dichroic plate to perform frequency separation assuming horns in both systems are cooled. ConclusionAn analysis of the ma-band horn design shows good performance. Fabrication of a prototype horn is in p...

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TE /sub 11/ to HE /sub11/ Cylindrical Waveguide Mode Converters Using Ring-Loaded Slots

Cited by 51 publications

References 4 publications

Spline-Profile Smooth-Walled C-Band Horn

Spline-Profile Smooth-Walled C-Band Horn

Feed Antennas

X/Ka-band dual frequency horn design

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