Metasurface For Microstrip-fed Slot Antennas
Microstrip feedline enables the control of the coupling and provides good matching.The annular-slot is connected to the split-ring-slot by a rectangular slot, which increases the surface of the current path, thus notably reducing the resonant frequency for a given size.The embedded split-ring-slot structure allows many resonant modes to be. A low-profile reconfigurable antenna with a capability of generating multidirectional beams is presented in this paper. The design consists of a 4 × 4 unit cells metasurface (MS), a four-slotted ground plane, and a reconfigurable feeding network.
Abstract
Metasurface For Microstrip-fed Slot Antennas Ham Radio
The metasurface concept has emerged as an advantageous reconfigurable antenna architecture for beam forming and wave-front shaping, with applications that include satellite and terrestrial communications, radar, imaging, and wireless power transfer. The metasurface antenna consists of an array of metamaterial elements distributed over an electrically large structure, each subwavelength in dimension and with subwavelength separation between elements. In the antenna configuration we consider, the metasurface is excited by the fields from an attached waveguide. Each metamaterial element can be modeled as a polarizable dipole that couples the waveguide mode to radiation modes. Distinct from the phased array and electronically-scanned-antenna architectures, a dynamic metasurface antenna does not require active phase shifters and amplifiers but rather achieves reconfigurability by shifting the resonance frequency of each individual metamaterial element. We derive the basic properties of a one-dimensional waveguide-fed metasurface antenna in the approximation in which the metamaterial elements do not perturb the waveguide mode and are noninteracting. We derive analytical approximations for the array factors of the one-dimensional antenna, including the effective polarizabilities needed for amplitude-only, phase-only, and binary constraints. Using full-wave numerical simulations, we confirm the analysis, modeling waveguides with slots or complementary metamaterial elements patterned into one of the surfaces.
Metasurface For Microstrip-fed Slot Antennas Antenna
7 More- Received 27 June 2017
DOI:https://doi.org/10.1103/PhysRevApplied.8.054048
© 2017 American Physical Society
