Broadband interconnected receiver–transmitter surface for generating dual circularly polarized dual beams

Huili Wang,Ruirong Dang,Pei Yang,Hongwei Qin

doi:10.1063/5.0075559

Huili Wang, Ruirong Dang + Show 2 more

Open Access

https://doi.org/10.1063/5.0075559

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Abstract

We propose an interconnected receiver–transmitter surface (IRTS) for simultaneously generating left-hand circularly polarized (CP) beams and right-hand CP beams based on the Pancharatnam–Berry phase, thus realizing dual CP dual beam radiations. The IRTS is composed of upper-layer gradient patches and lower-layer periodic patches that are connected by the metal probes that cross the center tears of the middle metal ground. The lower-layer patches of the IRTS can receive linearly polarized waves and couple the energy into the upper-layer by the metal probe for obtaining dual CP dual beam radiations. In particular, the working bandwidth of the present design can also be further extended when both IRTSs with adjacent working frequency bands are superimposed on each other to form a broadband IRTS (BIRTS). Finally, we fabricate the proposed IRTS and BIRTS with a standard gain horn antenna as the feed and experimentally demonstrate the functionalities of generating dual CP dual beams.

Highlights

Polarized (CP) waves have played an important role in developing wireless satellite communication systems due to advantages such as minimizing the polarization mismatch component and restraining environmental interference compared with linearly polarized (LP) waves
The unit cell is composed of a patch unit cell as the upper-layer, metal ground with center tear as the middle-layer, and patch unit cell as the lower-layer, where threelayer structures are separated by two-layer substrates and the patch unit cells in the upper and lower layers can be connected by the metal probes that are across the center tears of the metal ground
For the interconnected receiver–transmitter surface (IRTS), the left-hand CP (LHCP) beam has a peak gain of 17.2 dBic at −20○, and the right-hand CP (RHCP) beam has a peak gain of 16.9 dBic at 18○

Summary

Introduction

Polarized (CP) waves have played an important role in developing wireless satellite communication systems due to advantages such as minimizing the polarization mismatch component and restraining environmental interference compared with linearly polarized (LP) waves. Dual CP systems have been widely used and are capable of improving communication capacity, reducing channel interferences, and allowing flexible orientations of the transmitter and receiver compared with the single-polarization system. The phase gradient surface is an anisotropic structure with sub-wavelength thickness, which can produce different phase gradients to tune the radiation direction and the polarization state of reflected and transmitted waves.. Transmissive meta-surfaces have demonstrated the great capability of generating two symmetric CP beams with opposite helicities by employing a multilayer structure, cavity meta-surface, and partially reflecting metasurface sandwich.. Considering the thickness of the multilayer structure and the narrow bandwidth of the cavity metasurface and the partially reflecting metasurface sandwich, it is always scitation.org/journal/adv desirable to propose a meta-surface structure with small thickness and wide bandwidth for achieving dual CP dual beam radiations The phase gradient surface is an anisotropic structure with sub-wavelength thickness, which can produce different phase gradients to tune the radiation direction and the polarization state of reflected and transmitted waves. Currently, phase gradient surfaces have demonstrated the great capability of producing highly collimated beams, converting electromagnetic (EM) waves into different polarizations, and even simultaneously manipulating wave directions and polarizations. In particular, functional transmissive metasurfaces have been proposed to achieve an unprecedented DOF of EM wavefront control by independently controlling phase, amplitude, and polarization and to demonstrate the function of wavelength-direction multiplexed with high capacity, high efficiency, and extra DOFs. In the previous research has indicated the perfect polarization changes in LP waves to dual CP dual beams and tuned the radiation directions of both CP components at the same time by regulating the orientations of Pancharatnam–Berry (PB) elements. Transmissive meta-surfaces have demonstrated the great capability of generating two symmetric CP beams with opposite helicities by employing a multilayer structure, cavity meta-surface, and partially reflecting metasurface sandwich. considering the thickness of the multilayer structure and the narrow bandwidth of the cavity metasurface and the partially reflecting metasurface sandwich, it is always scitation.org/journal/adv desirable to propose a meta-surface structure with small thickness and wide bandwidth for achieving dual CP dual beam radiations

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