Focusing of high power millimeter-wave radiation by a quasi-optical antenna system

1991 ◽  
Vol 70 (5) ◽  
pp. 979-988 ◽  
Author(s):  
SHOJI MIYAKE ◽  
OSAMI WADA ◽  
MASAMITSU NAKAJIMA ◽  
TOSHITAKA IDEHARA ◽  
G. F. BRAND
Keyword(s):  
Millimeter Wave ◽  
High Power ◽  
Antenna System ◽  
Wave Radiation ◽  
Optical Antenna

Advanced Ceramics Sintering Using High-Power Millimeter-Wave Radiation

1996 ◽  
Vol 430 ◽  
Author(s):  
Y. Setsuhara ◽  
M. Kamai ◽  
S. Kinoshita ◽  
N. Abe ◽  
S. Miyake ◽  
...  
Keyword(s):  
Silicon Nitride ◽  
Millimeter Wave ◽  
High Power ◽  
Antenna System ◽  
Wave Radiation ◽  
Optical Antenna ◽  
60 Ghz ◽  
Densification Temperature ◽  
Multi Mode ◽  
Focused Beam

AbstractThe results of ceramics sintering experiments using high-power millimeter-wave radiation are reported. Sintering of silicon nitride with 5%Al2O3 and 5%Y2O3 was performed in a multi-mode applicator using a 10-kW 28-GHz gyrotron in CW operation. It was found that the silicon nitride samples sintered with 28 GHz radiation at 1650'C for 30 min reached to as high as theoretical density (TD), while the conventionally sintered samples at 1700°C for 60 min resulted in the density as low as 90% TD. Focusing experiments of millimeter-wave radiation from the high-power pulsed 60-GHz gyrotron have been performed using a quasi-optical antenna system (two-dimensional ellipso-parabolic focusing antenna system) to demonstrate the feasibility of the power density of as high as 100 kW/cm2. Typical heating characteristics using the focused beam were made clear for this system. It was found that the densification of yttria-stabilized zirconia (ZrO2-8mol%Y2O3) samples to as high as 97% TD was obtained from the sintering with focused 60 GHz beam in pulse operation with a 10-ms pulse duration at a 0.5Hz repetition. The densification temperature for the zirconia could be lowered by 200°C than that expected conventionally.

Production of ECR Mirror Plasma by High Power Millimeter-Wave Radiation

1988 ◽  
Vol 27 (Part 1, No. 7) ◽  
pp. 1281-1286 ◽  
Author(s):  
Yoshiaki Arata ◽  
Shoji Miyake ◽  
Hiroaki Kishimoto ◽  
Nobuyuki Abe ◽  
Yoshinobu Kawai
Keyword(s):  
Millimeter Wave ◽  
High Power ◽  
Wave Radiation

Fabrication of Bulk Ceramics by High-Power Millimeter-Wave Radiation

2001 ◽  
Vol 40 (Part 1, No. 2B) ◽  
pp. 1080-1082 ◽  
Author(s):  
Yukio Makino ◽  
Toshiyuki Ueno ◽  
Takeshi Matsumoto ◽  
Shoji Miyake
Keyword(s):  
Millimeter Wave ◽  
High Power ◽  
Wave Radiation

Mirror-Trapped Plasma Heated by High-Power Millimeter-Wave Radiation as an Electron-Cyclotron-Resonanse Source of Soft X-Rays

2001 ◽  
Vol 40 (Part 1, No. 2B) ◽  
pp. 1016-1017
Author(s):  
Alexander V. Vodopyanov ◽  
Sergey V. Golubev ◽  
Vladimir G. Zorin ◽  
Andrey Yu. Kryachko ◽  
Alexey Ya. Lopatin ◽  
...  
Keyword(s):  
Millimeter Wave ◽  
High Power ◽  
Electron Cyclotron ◽  
Wave Radiation ◽  
X Rays

scholarly journals A reflective millimeter-wave photonic limiter

2022 ◽  
Vol 8 (2) ◽  
Author(s):  
Rodion Kononchuk ◽  
Suwun Suwunnarat ◽  
Martin S. Hilario ◽  
Anthony E. Baros ◽  
Brad W. Hoff ◽  
...  
Keyword(s):  
Millimeter Wave ◽  
High Power ◽  
Free Space ◽  
Damage Threshold ◽  
Wave Radiation ◽  
Wide Aperture

Wide-aperture free-space limiter with enhanced damage threshold provides protection from high-power millimeter-wave radiation.

The Quasioptical Gyrotron, A High-Power, Tunable Source of Millimeter-Wave Radiation

1994 ◽  
Vol 347 ◽  
Author(s):  
Arne W. Fliflet ◽  
Richard P. Fischer
Keyword(s):  
Millimeter Wave ◽  
High Power ◽  
Energy Recovery ◽  
Wave Radiation ◽  
Fusion Plasmas ◽  
Fabry Perot ◽  
High Power Operation ◽  
Depressed Collector ◽  
Power Operation ◽  
Tunable Source

ABSTRACTThis talk will summarize the present state of the art of the quasioptical gyrotron (QOG), an alternative gyrotron configuration which has been under development primarily in the U.S. and Switzerland for heating fusion plasmas in tokamaks and other high-power millimeter-wave applications. The QOG features an open-mirror Fabry-Perot resonator instead of the conventional waveguide cavity used in conventional gyrotrons. This gives the QOG the potential for wide tunability, advantages for high-power operation, and facilitates the use of a depressed collector for spent electron beam energy recovery. An experimental QOG has been tuned from 85 to 130 GHz by varying the applied magnetic field. QOGs have produced peak powers up to 600 kW for 13 μs pulses and 100 kW for 10 ms pulses. Electronic efficiencies up to 22% have been achieved at 85 GHz, and operation with a depressed collector yielded an overall efficiency of 30%. The design of a multi-kW CW QOG tunable from 80 to 120 GHz is discussed.

scholarly journals Investigation on a 220 GHz Quasi-Optical Antenna for Wireless Power Transmission

Electronics ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 634
Author(s):  
Meng Han ◽  
Xiaotong Guan ◽  
Moshe Einat ◽  
Wenjie Fu ◽  
Yang Yan
Keyword(s):  
Gaussian Beam ◽  
Millimeter Wave ◽  
Power Transmission ◽  
Divergence Angle ◽  
Wave Radiation ◽  
Optical Antenna ◽  
Wireless Power ◽  
Wireless Power Transmission ◽  
Output Beam ◽  
Long Distance

This paper investigates a 220 GHz quasi-optical antenna for millimeter-wave wireless power transmission. The quasi-optical antenna consists of an offset dual reflector, and fed by a Gaussian beam that is based on the output characteristics of a high-power millimeter-wave radiation source-gyrotron. The design parameter is carried on by a numerical code based on geometric optics and vector diffraction theory. To realize long-distance wireless energy transmission, the divergence angle of the output beam must be reduced. Electromagnetic simulation results show that the divergence angle of the output beam of the 5.6 mm Gaussian feed source has been significantly reduced by the designed quasi-optical antenna. The far-field divergence angle of the quasi-optical antenna in the E plane and H plane is 1.0596° and 1.0639°, respectively. The Gaussian scalar purity in the farthest observation field (x = 1000 m) is 99.86%. Thus, the quasi-optical antenna can transmit a Gaussian beam over long-distance and could be used for millimeter-wave wireless power transmission.

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