Abstract
On the basis of ordinary sinusoidal groove structures, an auxiliary sinusoidal distribution with a smaller etching period is superimposed, and a negative-taper is added, on the inner and outer conductor walls to form a coaxial Bragg structure with tapered-double-sinusoidal grooves. Through the FORTRAN software programming simulation experiments, we can see that compared with the ordinary sinusoidal grooves, the bandwidth of the working mode and competition mode gets narrower, the quality factor Q gets greater, the residual side-lobes are also suppressed, and the selectivity of frequency is enhanced when the coaxial Bragg structure adopts the tapered-double-sinusoidal grooves. At the same time, the center resonance frequency point of the competition mode is far away from the working mode, and the bandgap overlap is further separated. However, the reflectivity of the working mode decreases and the reflectivity of the competing mode increases with the increase in the gradient angle. These peculiarities of the negative-tapered-double-sinusoidal groove structure are favorable to construct a cavity with a narrower bandwidth and high quality factor and also are favorable to the mode selectivity.
Highlights
Bragg structures are widely used in optoelectronics, microwave electronics, terahertz technology, and many other fields, especially in the application of cyclotron autoresonance masers (CARMs) and free electron lasers (FELs) in the millimeter and submillimeter wave ranges
When the electromagnetic wave propagates, the electromagnetic wave in the specific frequency range will be affected by the coherent Bragg scattering and produce a strong reflection, which leads to the suppression of the transmission
The present paper is to demonstrate the frequency response characteristics of the tapered-double-sinusoidal groove structure operating at 0.35 THz frequency
Summary
Bragg structures are widely used in optoelectronics, microwave electronics, terahertz technology, and many other fields, especially in the application of cyclotron autoresonance masers (CARMs) and free electron lasers (FELs) in the millimeter and submillimeter wave ranges. The important characteristic of the Bragg structure is the electromagnetic bandgap effect. When the electromagnetic wave propagates, the electromagnetic wave in the specific frequency range will be affected by the coherent Bragg scattering and produce a strong reflection, which leads to the suppression of the transmission It can ensure the normal transmission of the high-energy electron beam and provide a good frequency selectivity for the set working mode. The frequency response characteristics of the tapered-double-sinusoidal groove structure working at 0.35 THz are studied. These characteristics facilitate the processing and heat dissipation of the reflector and improve the mode selectivity. The present paper is to demonstrate the frequency response characteristics of the tapered-double-sinusoidal groove structure operating at 0.35 THz frequency. Characteristics of frequency response in the tapered-double-sinusoidal groove structure operating at 0.35 THz frequency are demonstrated.
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