Abstract
We consider the scattering of the H-polarized eigenwaves of a planar dielectric waveguide by a coplanar system of graphene strips in the THz range. The strips are placed along the centreline of the waveguide. Our treatment is based on the singular integral equations with the Nystrom-type discretization algorithm. Dependences of the scattering characteristics, near and far fields, are studied. Frequency scanning radiation patterns are presented. Maximum of the radiated power is observed near the plasmon resonances. The resonant frequency and main lobe level can be controlled by variation of the chemical potential. Applied optimization procedure allows to obtain the radiation pattern with the side-lobe level less than − 20 dB. The presented results can be used in designing of graphene leaky-wave antennas.
Highlights
Radiating structures based on gratings embedded into a dielectric waveguide transforming eigenwaves to free space waves are promising as low-cost, low-profile, and easy-to-fabricate elements of millimeter-wave devices such as filters or antennas with frequency scanning ability [1, 2]
In the present work we study how the radiation from the dielectric waveguide with finite graphene strip grating can be controlled in the THz range
The radiation patterns calculated with the help of HFSS show slight instability: the width and the angle of the main lobe vary in the interval 20...30, the angle and magnitude of the side-lobes significantly depends on the size of the "vacuum box"
Summary
Radiating structures based on gratings embedded into a dielectric waveguide transforming eigenwaves to free space waves are promising as low-cost, low-profile, and easy-to-fabricate elements of millimeter-wave devices such as filters or antennas with frequency scanning ability [1, 2]. In the absence of spatial dispersion and magnetostatic bias field, the conductivity of graphene is a scalar function = ( f , c, ,T ) of frequency f , chemical potential c , electron relaxation time , and temperature T. It can be obtained from the Kubo formalism [19, 20]. In the present work we study how the radiation from the dielectric waveguide with finite graphene strip grating can be controlled in the THz range. Preliminary results were presented in the conference papers [35, 36]; here results are significantly extended
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