Minimizing RF Performance Spikes in a Cryogenic Orthomode Transducer (OMT)

Henke, Doug; Claude, S.

doi:10.1109/tmtt.2014.2309551

Cited by 41 publications

(22 citation statements)

References 17 publications

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“…Unlike the higher frequency ALMA cartridge bands from Band-3 to Band-10 where superconductor-insulator-superconductor (SIS) mixers were used to achieve required sensitivity for signal detection, Band 1 uses hetero-junction field effect transistor (HFET) cryogenically cooled amplifiers as the first receiver stage. In the Band 1 cartridge design, despite the unavoidable optics loss and insertion loss of the orthomode transducer (OMT) [2], the sensitivity of the receiver is mainly determined by the noise and gain performance of the cryogenic low noise amplifiers (LNAs). The incoming beam from the ALMA antenna is refocused by a warm lens, which acts as vacuum window, and collected by a corrugated feedhorn at the 15K stage.…”

Section: Designmentioning

confidence: 99%

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The Atacama Large Millimeter/sub-millimeter Array band-1 receiver

et al. 2016

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The Atacama Large Millimeter/submillimeter Array(ALMA) Band 1 receiver covers the 35-50 GHz frequency band. Development of prototype receivers, including the key components and subsystems has been completed and two sets of prototype receivers were fully tested. We will provide an overview of the ALMA Band 1 science goals, and its requirements and design for use on the ALMA. The receiver development status will also be discussed and the infrastructure, integration, evaluation of fully-assembled band 1 receiver system will be covered. Finally, a discussion of the technical and management challenges encountered will be presented.

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Section: Designmentioning

confidence: 99%

“…The incoming beam from the ALMA antenna is refocused by a warm lens, which acts as vacuum window, and collected by a corrugated feedhorn at the 15K stage. The two orthogonal polarizations (0 and 1) are then split using an OMT [2]. The signals are then amplified with cryogenic low noise amplifiers fixed to the 15K stage [3].…”

Section: Designmentioning

confidence: 99%

The Atacama Large Millimeter/sub-millimeter Array band-1 receiver

et al. 2016

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“…The circular input (diameter 2.62 mm) is manufactured on the first black layer. The two-fold symmetric coupling section (turnstile junction) [4]- [8] lays on the gray layers (4 and 5). Its four rectangular outputs (2.144 mm 1 mm) are highlighted with dashed lines.…”

Section: The W-band Omtmentioning

confidence: 99%

“…Furthermore, low-loss and low-reflection levels are necessary. The above mentioned considerations lead to the exploitation of an OMT structure with a two-fold-symmetric coupling section [4]- [8]. As well known, two-fold symmetric configurations are generally more complex to implement with respect to the one-fold symmetric [9] and asymmetric ones [10], [11], owing to the presence of two recombination networks.…”

Section: Introductionmentioning

confidence: 99%

W-Band Orthomode Transducer for Dense Focal-Plane Clusters

Virone

Peverini

Lumia

et al. 2015

IEEE Microw. Wireless Compon. Lett.

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A W-band orthomode transducer has been designed for polarimeter clusters in dense focal planes. Its compact geometry, with aligned output ports, allows for a closely-spaced triangular-lattice arrangement. At these high frequencies, the platelet manufacturing strategy has been applied and verified experimentally on seven prototypes, showing reflection coefficients lower than dB, insertion loss of about 0.25 dB and cross-coupling and isolation levels of dB and 45 dB, respectively, in a 30% bandwidth.Index Terms-Antenna feeds, polarimeter, radio astronomy, waveguide junctions. 1531-1309

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“…The latter have also been used in the literature to implement circulators [100] and narrowband orthomode transducers (OMTs) [101,102]. Wideband OMTs typically employ bends, tapered waveguides and directional couplers [103][104][105] or, alternatively, power dividers [106]. Likewise, numerous filters, from band-pass [107,108] to low-pass [109][110][111], highpass [112] and even band-stop [113] filters include bi-dimensional building blocks.…”

Section: State Of the Artmentioning

confidence: 99%

Full-wave characterization of bi-dimensional cavities and its application to the design of waveguide filters and multiplexers

Candau¹

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AgradecimientosA pesar de las dudas iniciales que tenía sobre cual podía ser mi aportación a un mundo tan estudiado como el de los dispositivos de microondas en guía de onda, considero que la decisión de realizar esta tesis ha sido todo un acierto. La colaboración entre la Universidad Politécnica de Valencia y la empresa de base tecnológica Aurorasat ha permitido enfrentarme a problemas de interés científico, pero que a su vez tienen aplicación práctica directa en la industria. Agradezco enormemente a Vicente Boria por haber hecho posible esta colaboración, haberme animado a embarcarme en ella y confiado en que la llevaría a cabo conéxito. Sin su liderazgo y tenacidad, esta tesis no hubiera sido posible.Durante el desarrollo de la misma he tenido la gran suerte de contar con dos valiosos mentores, como son Jordi Gil y Pablo Soto. Para mí han sido toda una referencia tanto profesional como personal. Han sabido orientarme en momentos críticos, y su implicación ha sido total desde el primer momento. Gran parte de lo que he aprendido durante todos estos años sobre electromagnetismo y diseño de componentes de microondas se lo debo a ellos. Sin duda, este trabajo no hubiera tenido la misma calidad sin sus innumerables aportaciones.Por otro lado, también quisiera reconocer la contribución de otras personas por las que tengo gran admiración. A Carlos Vicente, por plantar algunas de las semillas que han dado lugar a esta tesis, así como por las enriquecedoras discusiones que hemos tenido todo este tiempo y el apoyo que me ha brindado. También a Santiago Cogollos, que me introdujo en el mundo BI-RME y la teoría de filtros, y que siempre ha me ha prestado una valiosa ayuda cuando lo he necesitado.Por supuesto, debo agradecer a Marco Gugliemli por permitirme explorar algunas de sus innovadoras ideas sobre filtros HFRW, y a la Prof. Kawthar Zaki por acogerme en su laboratorio de la University of Maryland. Asímismo, a mis compañeros de Aurorasat y el GAM, con los que he compartido muy buenos momentos.Porúltimo, a mi familia por todo su apoyo. Su confianza en mi capacidad para llevar a cabo esta tesis ha sido de gran ayuda para seguir adelante. A mis amigos y brothers, por estar ahí siempre. Y a Ellen, por todos losánimos que me ha dado, en especial a la hora de escribir. ivCon esta tesis se cierra un capítulo de mi vida y se abre uno nuevo. Espero que, sea donde sea, sigamos colaborando durante muchos años. Carlos Carceller AbstractModern communications systems impose stringent requirements on the equipment that operates at microwave frequency, especially in the case of wireless communications. The design of passive components for these applications is contingent upon the availability of accurate electromagnetic (EM) modeling tools that can efficiently handle the complex geometry of these components. Despite the widespread use of mesh-based general-purpose computer-aided engineering (CAE) tools to perform final design verifications, their application during the optimization process is limited. Optimum designs require a large ...

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Minimizing RF Performance Spikes in a Cryogenic Orthomode Transducer (OMT)

Cited by 41 publications

References 17 publications

The Atacama Large Millimeter/sub-millimeter Array band-1 receiver

The Atacama Large Millimeter/sub-millimeter Array band-1 receiver

W-Band Orthomode Transducer for Dense Focal-Plane Clusters

Full-wave characterization of bi-dimensional cavities and its application to the design of waveguide filters and multiplexers

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