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Dual-polarized probes with wide-bandwidth operational capabilities are highly desirable for time-efficient Planar Near-Field (PNF) measurements [1]-[3]. However, sometimes the performance tradeoffs necessary to achieve the desired operating bandwidth make such probes impractical for many applications. Traditional probes are often bandwidth limited, and their electrical size can be an undesired source...
Temperature changes cause thermal expansion of antenna materials and will have an important impact on antenna performances. In some applications, it is sufficient to calculate the antenna deformation by mechanical analysis and determine the RF impact by EM analysis tools. However, if the environmental conditions of the final antenna are stringent and considered critical as in the case of military...
This paper summarizes the design and testing of an onboard antenna designed for the ground link communication in a stratospheric balloon system. The antenna operates at S-band and is based on a quad filar helix design with a shaped pattern in circular polarization. Measured radiation pattern results, testing and environmental qualification are presented.
Compact, low profile, wideband horns operating in the VHF band represent a challenge constrained by performance versus mechanical dimension and weight, together with available manufacturing techniques. This paper presents the design of a very compact, dual polarized, wide bandwidth horn in VHF band suitable for antenna measurement applications. The initial study, manufacturing and final verification...
This paper summarizes the design of the S-band antenna feed for a Balloon Ground Station system based on an on-set parabolic reflector. The designed feed is a dual circularly polarised multi step septum polariser horn. Measured radiation pattern results, testing and environmental qualification are presented.
Temperature change cause thermal expansion of the antenna materials and will have an important impact on antenna performances. In some applications it is sufficient to calculate the antenna deformation due to temperature by mechanical analysis and determine the RF impact by EM analysis tools. However, if the environmental conditions of the final antenna are stringent and considered critical as in...
New developments in ortho-mode junctions (OMJ) and probe technologies has enabled dual polarized Near-Field and Far-Field measurement probes with as much as 1:4 bandwidth. The large bandwidth can be achieved while maintaining the high performance standards of traditional narrow band probes [1]-[3]. The new design approach is based on an inverted ridge structure providing four symmetrical access points...
Wideband dual polarized probes are often used for modern high precision measurement systems. A desired feature of a good probe is that the useable bandwidth should exceed that of the antenna under test so that probe mounting and alignment is performed only once during a measurement campaign. This paper describes a new field probe taking full advantage of the 1:4 bandwidth of the Ortho Mode Junction...
Temperature change cause thermal expansion of the antenna materials and will have an important impact on antenna performances. In some applications it is sufficient to calculate the antenna deformation due to temperature by mechanical analysis and determine the RF impact by EM analysis tools. However, if the environmental conditions of the final antenna are stringent and considered critical like in...
This paper describes a new field probe taking full advantage of the 1: 4 OMJ bandwidth overcoming the aperture size problem by applying different apertures on the same OMJ. The apertures are circularly symmetric so the exchange of apertures can be performed rapidly without the need to repeat calibration and alignment procedures for the full probe.
Recent advances in the design of orthomode junctions (OMJs) have created new devices capable of achieving as much as a 1:4 bandwidth, while maintaining the high performance of traditional OMJ designs. The new OMJ technology is based on an inverted-ridge structure, with four symmetrical feeding points for external balanced feeding, stabilizing the frequency dependence of the OMJ. This paper discusses...
Standard Gain Horns (SGH) often find use in modern antenna measurements. They are utilized frequently either as measurements antenna or as reference antenna in antenna gain measurements by comparison or substitution method [1]. They also find use as source antennas in anechoic test chambers and for many other purposes such as fixed site antennas. The most widespread SGH geometry has a rectangular...
The development, manufacturing and test of dual circular polarized probes with up to 1:2 bandwidth has been discussed. Preliminary measurements with ldquoidealrdquo BFN show that the design is compliant with the specification.
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