Abstract
A novel low-profile dual-polarized magneto-electric dipole antenna with two choices of feeding probes are proposed and investigated. The antenna utilizes a radiating structure which adopts equilateral triangular cavities with small gaps as the magnetic dipole while maintaining the original rectangular planar patches as the electric dipole, reducing the thickness to $0.15\lambda _{0}$ (where $\lambda _{0}$ is the free-space wavelength at the center frequency). Each type of the feeding probe has its own merit and demerit in terms of mechanical robustness, performance and assembly tolerance. Measurement results show that the prototypes achieve wide impedance bandwidth of 48% (SWR < 2), high gain (7.7 to 11 dBi) and unidirectional radiation patterns with low cross-polarizations (< −22dB) and back-radiation level.
Highlights
Fast evolving wireless communication systems require smaller antennas with better performances in terms of bandwidth, gain and radiation patterns. Conventional designs such as horn, log-periodic and reflector antenna are incompatible with most modern wireless communication systems due to their bulky structure [1]
Microstrip patch antennas have been widely used for its low profile and convenience of fabrication
In 2006, Wong and Luk developed a new kind of complementary antenna called magneto-electric (ME) dipole which combines a shorted patch antenna with an electric dipole [14]
Summary
Fast evolving wireless communication systems require smaller antennas with better performances in terms of bandwidth, gain and radiation patterns. Microstrip patch antennas have been widely used for its low profile and convenience of fabrication To cope with their major limit in narrow bandwidth, many techniques have been studied, such as aperture-coupled feed [2]–[4], capacitive feed [5], L-probe [6], M-probe feed [7]–[9] and high-order mode [10]–[13]. In 2006, Wong and Luk developed a new kind of complementary antenna called magneto-electric (ME) dipole which combines a shorted patch antenna with an electric dipole [14] This type of antenna possesses advantages of wide bandwidth, high gain, low cross polarization and low backlobe radiation. In 2016, Lai developed a dual-polarized dual complementary source ME (DCS-ME) dipole antenna with thickness of 0.192λ0 using dual open-ended slot excitation [27] Such design brings significant impairment to the radiation characteristics including the cross-polarization level.
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