A 650-GHz Backward Wave Oscillator Based on Axial Loaded Double Defected-Photonic Crystal SWS

Nashed, A. I.; Chaudhuri, S.K.; Safavi‐Naeini, Safieddin

doi:10.1109/tps.2017.2655009

Cited by 9 publications

(3 citation statements)

References 28 publications

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“…There are 19 resonant frequencies-corresponding to the 0-mode, π/18-mode, 2π/18-mode, 3π/18-mode, 4π/18-mode, 5π/18-mode, 6π/18-mode, 7π/18-mode, 8π/18-mode, 9π/18-mode, 10π/18-mode, 11π/18-mode, 12π/18-mode, 13π/18-mode, 14π/18-mode, 15π/18-mode, 16π/18-mode, 17π/18-mode, and π-mode-observed in both S 11 and S 12 . As per frequency relation formula [29]:…”

Section: A 022 Thz Bwo Based On Dual-gridded Cnt Cold Cathode Electrmentioning

confidence: 99%

Theoretical Study of a 0.22 THz Backward Wave Oscillator Based on a Dual-Gridded, Carbon-Nanotube Cold Cathode

et al. 2018

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The carbon nanotube (CNT) cold cathode is an attractive choice for millimeter and terahertz vacuum electronic devices owning to its unique instant switch-on and high emission current density. A novel, dual-gridded, field emission architecture based on a CNT cold cathode is proposed here. CNTs are synthesized directly on the cathode surface. The first separating grid is attached to the CNT cathode surface to shape the CNT cathode array. The second separating grid is responsible for controlled extraction of electrons from the CNT emitters. The cathode surface electric field distribution has been improved drastically compared to conventional planar devices. Furthermore, a high-compression-ratio, dual-gridded, CNT-based electron gun has been designed to further increase the current density, and a 21 kV/50 mA electron beam has been obtained with beam transparency of nearly 100%, along with a compression ratio of 39. A 0.22 THz disk-loaded waveguide backward wave oscillator (BWO) based on this electron gun architecture has been realized theoretically with output power of 32 W. The results indicate that higher output power and higher frequency terahertz BWOs can be made using advanced, nanomaterial-based cold cathodes.

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Section: A 022 Thz Bwo Based On Dual-gridded Cnt Cold Cathode Electrmentioning

confidence: 99%

Theoretical Study of a 0.22 THz Backward Wave Oscillator Based on a Dual-Gridded, Carbon-Nanotube Cold Cathode

et al. 2018

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“…For analyzing and predicting the behavior of these devices, it is vitally important to know the dispersion characteristics in these SWSs because dispersion relation provides information regarding the probable oscillating frequency and possible operation at positive or negative group velocity, along with the knowledge about coupling coefficients of the electron and solution of mode competition . Extensive development of BWOs range from S‐band to terahertz (THz) frequencies . Experimental demonstration of multisection inhomogeneous SWSs have been reported for achieving higher efficiency while PIC simulation predicts 70% efficiencies at S band .…”

Section: Introductionmentioning

confidence: 99%

Dispersion characteristics and electromagnetic properties of semicircularly corrugated slow‐wave structure for backward‐wave oscillators

Al‐Amin

Amin

Sagor

2018

Int J Numerical Modelling

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The dispersion relation of semicircularly corrugated slow‐wave structure (SCCSWS) is calculated and verified numerically using synthetic technique. The metallic periodic structure resonates at discrete frequencies when both ends of it are shorted and excited properly. From the discrete frequencies of the axial modes of the resonant cavity, continuous dispersion curve for both the fundamental and the higher order passband modes (TM01‐TM03) are generated. The generated dispersion curve is compared with the analytical results, which agree excellently with a maximum deviation of 1.33% for TM01 mode, 1.94% for TM02 mode, and 1.30% for TM03 mode. The electromagnetic field patterns of SCCSWS in both radial and axial direction are also calculated and compared with analytical field patterns. Comparative results validate both the obtained dispersion relation and field patterns of SCCSWS, which can be employed as viable alternative of the existing slow‐wave structure (SWS) in high‐power microwave devices.

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“…The concept of photonic crystals has been used for designing novel SWSs and also for improving the performance of existing SWSs [19]- [21]. A novel SWS for BWO has been designed by arranging metal rods in a particular pattern and creating some intentional defects in [19], [20]. Photonic crystals have been used as the side wall of the corrugated rectangular waveguide SWS.…”

Section: Slow-wave Structures (Swss)mentioning

confidence: 99%

Application of planar helix slow-wave structure in backward-wave oscillators

Kumar¹

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I would also like to express my gratitude to the School of Electrical and Electronic Engineering, Nanyang Technological University, for offering me a peaceful working atmosphere and scholarship for this research. I also extend my gratitude to every staff and friend in the Satellite Research Centre, NTU for their help during my Ph.D. Besides, I would like to thank all my friends at NTU. Last but not least, I would like to express sincere thanks to my father Muraleedharan Nair, my mother Indhiramma, my brother Arun, and my wife Anupama for their understanding and encouragement.

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A 650-GHz Backward Wave Oscillator Based on Axial Loaded Double Defected-Photonic Crystal SWS

Cited by 9 publications

References 28 publications

Theoretical Study of a 0.22 THz Backward Wave Oscillator Based on a Dual-Gridded, Carbon-Nanotube Cold Cathode

Theoretical Study of a 0.22 THz Backward Wave Oscillator Based on a Dual-Gridded, Carbon-Nanotube Cold Cathode

Dispersion characteristics and electromagnetic properties of semicircularly corrugated slow‐wave structure for backward‐wave oscillators

Application of planar helix slow-wave structure in backward-wave oscillators

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