The advancement of low earth orbit (LEO) satellite communication technology has necessitated the emergence of antenna systems with exceedingly stringent technical requirements, including beam scanning, dual-band ortho...
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The advancement of low earth orbit (LEO) satellite communication technology has necessitated the emergence of antenna systems with exceedingly stringent technical requirements, including beam scanning, dual-band orthogonal polarization, low-profile, low-cost, and lightweight. Programmable guided-wave-driven metasurfaces demonstrate dynamic and advanced control of electromagnetic (EM) waves without external spatial feeding, complex power divider and accompanying phase shifter networks, making it a good candidate for LEO satellite communication. Herein, a frequency-multiplexed guided-wave-driven metasurface for independent and dynamic control of dual-band EM waves is proposed to achieve uplink and downlink in LEO satellite communication. Through vias are utilized to connect the meta-atoms and the bottom layer of the substrate integrated waveguide, realizing a guided-wave-driven metasurface in which a complicated feeding network of radiation-type metasurface can be avoided. By modulating the states of the four p-i-n diodes integrated within each meta-atom, dynamic and independent 1-bit phase switching across two distinct, tailored frequency bands is achieved. To validate this concept, the designed metasurface is fabricated and characterized, which exhibits excellent beam-scanning performance at the two operating bands: 10.4 GHz for downlink and 12.5 GHz for uplink. The proposed low-profile, dual-band, and programmable metasurface shows great application potential in further satellitecommunication.
In this work, a frequency-multiplexed multifunctional coding metasurface is proposed, which can realize focusing lens at the lower frequency and multiple scattering beams at the higher frequency. The two functions can...
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In this work, a frequency-multiplexed multifunctional coding metasurface is proposed, which can realize focusing lens at the lower frequency and multiple scattering beams at the higher frequency. The two functions can be manipulated independently. The proposed metasurface is composed of the top metal patch with a circular ring, two fan rings and two rectangle patches (CFRP), the bottom metal patch with C-shaped and rectangular metal slots (CRS) and a dielectric substrate. By changing the opening direction and size of CRS and the tilt direction and fan ring size of CFRP, the amplitude and phase of transmission and reflection can be modulated, respectively. The transmission mode works at 7 GHz, which can form focal points in different focal planes. The reflection mode works at 17.5 GHz, which can form multiple scattered beams in different directions in the far field. To further verify its practical feasibility, the proposed metasurface is fabricated and measured, the experimental results are in good agreement with the numerical simulation results. The proposed metasurface provides new possibilities to develop multifunctional devices.
A scalar-tensor composite holographic impedance meta surface (HIMS) for frequency-multiplexed is proposed. The scalar and tensor parts operate at low frequency and high frequency, respectively, the coupling between th...
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A scalar-tensor composite holographic impedance meta surface (HIMS) for frequency-multiplexed is proposed. The scalar and tensor parts operate at low frequency and high frequency, respectively, the coupling between them can be over come, and then more multifunction orbital angular momentum (OAM) beams with good performance can be obtained. As an example, a scalar-tensor HIMS is designed for three OAM beams: (1) Beam-I at fL = 11.2 GHz, which is generated by scalar part. (2) At fH = 18.2 GHz, Beam-II and Beam-III, which are generated by tensor part. The proposed scalar-tensor HIMS has the following advantages: (i) More flexible multifunction design due to the decoupling of scalar and tensor parts. (ii) High aperture efficiency (14.93% at 11.2 GHz, much higher than conventional scalar HIMS, 23.3% at 18.2 GHz). The HIMS can be used in future high-capacity secure communication, imaging, and so on.
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