Development Activity of Terahertz Power Amplifiers -W-band to 300GHz-

Transcription

1 6 th Japan-EU Symposium on ICT Research and Innovation at Makuhari Messe Development Activity of Terahertz Power Amplifiers -W-band to 300GHz- Oct. 7, 2016 NEC Network and Sensor Systems, Ltd. Microwave Tubes Division Norio Masuda, Mitsuru Yoshida, Koji Okamoto

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3 Agenda 1. Introduction of our TWT 2. TWT for wireless communications and power modules 3. Other application This work was supported in part by R&D on amplifier technology in 300 GHz band, in a part of R&D program on key technology in terahertz frequency bands of the Ministry of Internal Affairs and Communications, Japan.

4 Expected Applications Fixed to Mobile High data-rate Communication Network Imaging Systems Fixed Wireless Links THz signal Autonomous Driving Safety & Security (Walking trough) Non-destructive Inspection 4 NEC Corporation Network and 2015 Sensor System, Ltd NEC Group Internal Use Only

5 Review of Amplifier Devices Limits of microwave tubes 10 5 Radar (TWT/KLY/MAG 10 4 /CFA) 10 3 Competitive Power Limits of Single Device (Solid State) Solid state Earth station (TWT/KLY/HPA) Satellite Term./FWA (MPM/MMPM) Limits of Combined Solid State Amplifiers Ku/K/Ka Microwave tubes W Space (TWT/MAG/HPA) THz apps. (TWT) 10 0 Frequency(THz) J [W] (Atmospheric Attenuation) 0.1THz (NETS) THz Target [THz] (Review of Power Module) MAG: Magnetron KLY: Klystron CFA: Cross Field Device FWA: Fixed Wireless Access MPM: Microwave Power Module MMPM: Millimeter wave Power Module 1 5 NEC Corporation Network and 2015 Sensor System, Ltd NEC Group Internal Use Only

6 Introduction of our TWT

7 TWT TWT:Traveling Wave Tube Classified in Microwave Vacuum Devices (MVEDs) Achieve a high degree of amplification by interaction between electron beam and electromagnetic wave* Small and simple device structure, High efficiency, High power in high frequencies *Bring electromagnetic wave into sync with electron beam. Example of TWT Millimeter wave power module (IEEE Trans. Electron Devices, 52, 5, ) 7 NEC Corporation Network and 2015 Sensor System, Ltd NEC Group Internal Use Only

8 Use cases Earth station Broadcasting Satellite System (8GHz 20W TWT) SNG (Satellite News Gathering) Satellite relay vehicle 8 Power module for satellite relay vehicle NEC Network Corporation and2015 Sensor System, Ltd NEC Group Internal Use Only Satellite ECR ion source heavy ion radiotherapy

9 Basic structure of TWT Electron gun Generating electron beam RF Input / Output RF (Waveguide) Ex)864 x 432µm RF(Amplified) RF window Maintained in vacuum and RF transmission Collector Collecting spent electron beam Slow Wave Circuit Helix (Millimeter wave band) Periodic permanent magnet(ppm) Focusing electron beam Slow Wave circuit Amplified by interaction between RF and electron beam Folded Waveguide (THz wave band) Ex)653 x 95µm 9 NEC Corporation Network and 2015 Sensor System, Ltd NEC Group Internal Use Only

10 TWT for wireless communications and power modules

11 W-band GHz 5W TWT (Outline dimension:7 7 30cm) (Folded waveguide slow wave circuit) ] m B [ d t u t p u O F R ] m B [ d t u t p u O F R f=90ghz Frequency [GHz] RF Input [dbm] NEC Corporation Network and 2015 Sensor System, Ltd NEC Group Internal Use Only

12 MIC R&D program on key technology in THz band -300GHz-band amplifier technology( ) (1) Establish over 1 Watt amplifier technology in 300GHz band(20db gain) (2) Realize small size portable amplifier (A4) (3) Demonstrate several Gbit class wireless transmission(20 to 40 Gbps) Beam stick tube FWG made by X-ray LIGA Develop a 300 GHz TWT by using MEMS technology and FWG slow wave structure Key device subjects Transmission Equipment Prototype of 300GHz power module Receiving Equipment 300GHz band signal generator ANT 300GHz ANT Receiver Power: 1W class Bandwidth: several GHz (Anechoic camber) Wireless communication system for demonstration research 12 NEC Corporation Network and 2015 Sensor System, Ltd NEC Group Internal Use Only

13 0.3THz-band power module Attenuation O2:60GHz H2O:183GHz H2O:325GHz [Expected use case] Between buildings Disaster prevention Sports Events Target O2:118GHz P-to-P Design ********** Beam test tube ******* FY2014 FY2015 FY2016 FY2017 TWT prototype ************* Power module Prototype Transmission demonstration *********** **** Frequency Power Gain Consumption 280 to 300GHz 1W 20dB 100W 13 NEC Corporation Network and 2015 Sensor System, Ltd NEC Group Internal Use Only

14 Other applications

15 W-band imaging Transimitter (SSA) Replacement W-band TWT Anttena Captured image DUT Sub-THz imaging camera Envelope Sensor Array 0.05 to 0.7 THz 64 64, 3 mm pitch Ceramics 15 NEC Corporation Network and 2015 Sensor System, Ltd NEC Group Internal Use Only

16 Future work Our power modules are expected to extend FWA transmission distance in THz band. Our next issues are: - Development of compact outdoor units - Further improvement of efficiency, linearity, bandwidth. Developmental utilization of power module technology can have a positive impact on the 5G technology. 16 NEC Corporation Network and 2015 Sensor System, Ltd NEC Group Internal Use Only

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