Brian Steer

Georgetown University

Author Statistics

Papers

Citation

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i-10 index

Research Trends

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Co-Authors

Albert Roitman

McGill University

Peter Horoyski

Georgetown University

Mark Hyttinen

Georgetown University

Richard Dobbs

Georgetown University

Dave Berry

Jet Propulsion Laboratory

Damon Berry

Technological University Dublin

D. Chernin

Leidos (United States)

N. Scott Barker

University of Virginia

M. Blank

Communications & Power Industries (United States)

M. Cattelino

Communications & Power Industries (United States)

Cooperative Institutions

Georgetown University

Jet Propulsion Laboratory

United States Naval Research Laboratory

California Institute of Technology

University of St Andrews

Leidos (United States)

University of Maryland, College Park

Science Applications International Corporation (United States)

University of Leicester

Andrews University

Author Statistics

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Research Field

High power 94 GHz amplifier for EarthCARE mission Doppler radar

M. Gambarara A. Battisti Marco Cantamessa Albert Roitman Richard Dobbs

EarthCARE (Earth Clouds, Aerosols and Radiation Explorer) is the 6th Earth Explorer Core Mission of the European Space Agency and a joint undertaking with the Japan Aerospace Exploration Agency (JAXA). It will study and analyze the interaction and impact of clouds and aerosols on the Earth's radiative budget. Along with other instruments, the satellite payload will include a 94 GHz Cloud Profiling Radar (CPR) with Doppler capability. This paper presents the development of a High Power Amplifier for the EarthCARE CPR and reviews HPA requirements, design and performance.

Payload (computing)

Earth observation

10.1109/ivelec.2009.5193406

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Citations (0)

A 263 GHz 10 Watt pulsed Extended Interaction Klystron amplifier

2022 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz) (2013)

Brian Steer Peter Horoyski Albert Roitman Mark Hyttinen Haotian Deng

A new model of vacuum tube amplifier, designed to produce over 10 Watts at 263 GHz is in development at CPI Canada. This device uses CPI's Extended Interaction Klystron technology, which has previously demonstrated good results from 17 to 220 GHz. With recent completion of a 264 GHz CW tunable oscillator, the amplifier development will extend the demonstrated envelope for EIKs to a frequency and power useful in DNP and other mm-wave applications.

Klystron

Watt

Envelope (radar)

Traveling-wave tube

Vacuum tube

10.1109/irmmw-thz.2013.6665706

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Citations (10)

On-Orbit Performance of the CloudSat EIK and Future Space Missions

Albert Roitman Maurice Viant Chris Nilsen M. Cattelino Dave Berry

This paper presents on-orbit performance of the CloudSat extended interaction klystron (EIK) and reviews requirements, design and performance of EIK's for future space missions. The CloudSat mission provides cross-sectional view of clouds with information on their thickness, altitude, optical properties, water and ice content. It is concluded that following successful development and on-orbit operation of the CloudSat EIK, more flight models of W-band and Ka-band EIK's are currently under development.

Orbit (dynamics)

10.1109/ivelec.2007.4283288

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Citations (3)

Millimeter-wave Extended Interaction Klystrons for high power ground, airborne and space radars

Brian Steer Albert Roitman Peter Horoyski Mark Hyttinen Richard Dobbs

This paper reviews the technology and demonstrated capability of millimeter wave Extended Interaction Klystrons for use in wide range of radar systems. It discusses design and manufacturing concepts stating self-imposed restrictions and design modifications to enhance RF performance, lifetime, reliability and extended operating frequency into the THz region. Presented data are supported using information provided by various academic and industrial customers.

Klystron

Extremely high frequency

Source

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Citations (4)

Compact, high power EIK sources used for ESR and NMR

Brian Steer Mark Hyttinen Albert Roitman Peter Horoyski Graham Smith

The EIKs described have demonstrated capability to provide mmW power suitable for improved ESR and NMR systems. The performance of EIKs at 94 GHz and 220 GHz is reviewed and possibilities for future improvement in performance, including increasing frequency, will be discussed. Presented data are supported by information provided by various academic and industrial customers.

10.1109/icimw.2008.4665478

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Citations (1)

Extended interaction sources above 220 GHz

International Conference on Infrared, Millimeter, and Terahertz Waves (2011)

Richard Dobbs Brian Steer

Summary form only given. CPI Canada have produced EIKs and EIOs at frequencies up to 220 GHz. Recent development programs have demonstrated that the technology exists to design and build Extended Interaction devices at low THz frequencies. This paper describes current and predicted performance of these devices, the design challenges and solutions to enable this performance.

10.1109/irmmw-thz.2011.6105059

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Citations (8)

Advantages of the Extended Interaction klystron Technology at Millimeter and Sub-Millimeter Frequencies

Albert Roitman Richard Dobbs Dave Berry Mark Hyttinen Peter Horoyski

The extended interaction klystron is one of the few readily available devices, capable of providing the required performance. This presentation describes the extended interaction klystron technology and presents improvements and design modifications in order to enhance power capability, bandwidth and to extend the operating frequency to the sub-millimeter region. A ladder-type RF circuit supports high efficiency and thermal stability at millimeter and sub-millimeter frequencies, while operating with moderate electron beam voltages. These EIKs operate at frequencies from 25 GHz to 280 GHz in continuous or pulsed modes.

Klystron

Extremely high frequency

10.1109/ppps.2007.4345972

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Citations (46)

Extended interaction klystrons for submillimeter applications

Damon Berry Peter Horoyski Mark Hyttinen Albert Roitman Brian Steer

The extended interaction klystron is one of the few available devices, which are capable of providing the required performance. This presentation describes the extended interaction klystron technology and presents improvements and design modifications in order to extend the operating frequency in to the sub-millimeter region.

Klystron

10.1109/icimw.2005.1572418

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Citations (11)

Sub-millimeter waves from a compact, low voltage Extended Interaction Klystron

Albert Roitman Damon Berry Mark Hyttinen Brian Steer

This paper reviews the demonstrated capability of mmW and Sub-mmW extended interaction klystrons at CPI Canada. It discusses design and manufacturing concepts including self-imposed restrictions followed by performance expectations into the THz region.

Klystron

Extremely high frequency

10.1109/icimw.2007.4516780

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Citations (21)

High Reliability, ≫10A/cm<sup>2</sup>, long-life, dispenser cathodes for space applications with multi-year in-orbit data from the CloudSat mission

M.C. Green Albert Roitman Brian Steer M. Cattelino G. Miram

This paper describes the dispenser cathode technology and cathode life testing at high current density that together underpin the design of a W-band 2 kW Extended Interaction Klystron developed for the nadir-pointing 94 Ghz radar of the CloudSat Earth Observation satellite. The cathode operates at an emission current density of 11.3 Amps/cm ² and, prior to launch, a 99% confidence level of meeting the mission goal of 22,500 hours operating life in orbit was required. The measured performance of the EIK amplifier in orbit is reported together with examples of cloud profiles obtained by the radar. The EIK life model has been validated and, based on the flawless performance of the radar in orbit and the high data yield, the mission has been extended from 2 years to 5.

Orbit (dynamics)

10.1109/ivelec.2009.5193412

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Citations (3)