A Broadband Hybrid Monopole-Dielectric Resonator Water Antenna

A nested square-shape dielectric resonator for microwave band antenna applications

“…To meet the demands of modern communication systems, it is necessary to reduce the size of the antenna while maintaining a wide impedance bandwidth as well as stable radiation characteristics [7][8][9][10][11]. With high permittivity material, a small size along with a high radiation efficiency can be achieved only for a very narrow operating band [12][13][14]. Utilization of medium values of dielectric constants facilitates the realization of a required impedance bandwidth and a small area allocated for the antenna footprint in the communication systems but it is usually insufficient to fulfill all the design requirements [15][16][17].…”

Function-Reconfigurable Water Short Backfire Antenna

“…In [11], a water dielectric resonator antenna (DRA) with a compact size was proposed. A monopole antenna made of pure water was reported in [14]. In [20], a wideband optically transparent water patch antenna was designed.…”

An ultra‐small cavity‐backed sector antenna with fractal transmission lines and NRI‐TLs for VHF application

“…The technique can reduce the size of Yagi‐Uda antennas and make the antenna elements be inductively loaded by adding a short‐circuited cylindrical cover. The paper present a hybrid water antenna operating at very high‐frequency (VHF) band, in which a simple seawater monopole is loaded with two distilled water cylinders working as dielectric resonators (DRs). A VHF microstrip patch antenna was developed to achieve a bandwidth of 45 MHz with dual‐linear‐polarization capability.…”

“…A VHF microstrip patch antenna was developed to achieve a bandwidth of 45 MHz with dual‐linear‐polarization capability. Due to the additional loading technique, the size of these antennas is not small enough for some application with stringent demands of miniaturization. Haksu and Gil‐Young proposed a very low‐profile wideband antenna operating from 30 to 300 MHz, while its weight is as heavy as 9.07 kg due to the employed ferrite.…”

“…In the last decades, several types of S-band antennas have been developed for small satellite communication systems. [2][3][4][5][6][7][8][9][10][11] One of the earliest S-band antenna for small satellite system was designed by Tanaka et al, 2 which was operated at 2.225GHz with 1.5% fractional bandwidth and…”