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This letter presents a novel circularly polarized water spiral antenna with polarization reconfigurability and low profile. It is basically an Archimedean spiral antenna with two water arms and fed by a parallel stripline. A conducting plate is used as the reflecting plane for unidirectional radiation. A glass container with two water channels, the upper one for left-hand circular polarization and...
A frequency-reconfigurable antenna integrated with solar cell is presented in this paper. The solar cell is used as a conducting plane and antenna is constructed by cutting a slot on the solar cell. The solar cell slot antenna is fed by a microstrip line under the solar cell. Moreover, water is employed as a reconfigurable and transparency dielectric loading for the antenna. The center frequency of...
A pure-water Yagi monopole operating at 1.62 GHz is presented in this paper, which comprises a probe-fed water monopole as the driven element and a water cylinder as the parasitic element. Both the driven and parasitic elements are isolated from the ground plane of infinite size using a thin layer of Teflon. By varying the diameter and radius of the parasitic element and the spacing between the two...
This paper introduces two types of reconfigurable water antennas. One is a water-grating leaky-wave antenna and the other is a sea-water monopole antenna. The water-grating leaky-wave antenna consists of a parabolic reflecting surface-wave launcher and a periodic water-grating structure, which is designed for wide-angle beam-scanning. While the sea-water monopole antenna mainly comprises of a Teflon...
This paper deals with the in-band RCS reduction of dielectric resonator antenna (DRA). Scattered fields by the DRA are initially separated into two parts: structural mode and antenna mode. By properly choosing the termination impedance at the antenna's port, the re-radiated field from the antenna mode can effectively cancel the scattered field by the structural mode, resulting in a substantial reduction...
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