Low-profile Magneto-electric Dipole Antenna Research Articles

A Low-profile Magneto-electric Dipole Antenna Based on Comb Structure and its Application in Frequency-Scanning Array with Ground

A Low-profile Magneto-electric Dipole Antenna Based on Comb Structure and its Application in Frequency-Scanning Array with Ground

Bandwidth-Enhanced Low-Profile Magneto-Electric Dipole Antenna With Shorting Parasitic Elements

This paper presents a low-profile magneto-electric (ME) dipole antenna with an enhanced impedance bandwidth realized by the loading of shorting parasitic elements. The antenna contains a horizontal planar electric dipole antenna, a <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\Gamma $ </tex-math></inline-formula> -shaped shorted patch antenna, a pair of parasitic L-shaped shorted patches, and a direct feed. By loading of the parasitic L-shaped patches such that they are shorted to the ground, the proposed antenna attains a significant bandwidth enhancement while maintaining excellent broadside radiation characteristics. An antenna prototype with a low profile of only <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$0.11\lambda _{0}$ </tex-math></inline-formula> was fabricated and tested ( <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\lambda _{0}$ </tex-math></inline-formula> is the free-space wavelength referring to the center frequency). The antenna achieves a measured impedance bandwidth of 75.64% (1.34–2.97 GHz) for a voltage standing wave ratio (VSWR) of less than 2. Within the operating band, the measured gain ranges from 6.23 to 8.49 dBi. Additionally, stable radiation patterns on both E- and H-planes with a high front-to-back ratio of more than 20.5 dB are achieved.

Substrate‐integrated low‐profile unidirectional antenna

In this study, a novel substrate integrated low-profile magneto-electric dipole antenna is proposed and investigated. The proposed antenna is composed of semi-circular patches as an electric dipole, vertical plated through holes which are shorted to the ground as a magnetic dipole, a modified ground, and a rectangular reflector for enhancing the gain. The antenna is fed via a Γ-shaped probe. The entire structure is achieved by the multilayer printed circuit board technology, and it is suitable for mass production and low cost. By introducing the defected ground structure, the total thickness of the proposed antenna is decreased to 0.082 λ 0 (where λ 0 is the free-space wavelength at 5.5 GHz). To improve the impedance matching, two open slots are etched on the semi-circular patches. An antenna prototype was fabricated and measured. The results illustrate that the antenna obtains a broad bandwidth of 14.7% from 5.10 to 5.91 GHz (voltage standing wave ratio (VSWR) ≤ 2). Moreover, the stable gain and unidirectional radiation patterns with low back lobe and low cross polarisation in the E - and H -plane are obtained over the operating frequency band. It is demonstrated that the antenna satisfies the requirements of 5G wireless local area network, worldwide interoperability for microwave access (WiMAX), and WiFi.

Low-Profile Magneto-Electric Dipole Antenna

A novel low-profile magneto-electric dipole antenna is proposed and investigated. The antenna utilizes an obtuse-triangular structure to work as a magnetic dipole, which reduces the antenna thickness to ${0.097 {\lambda}_0}$ (where ${{\lambda }_0}$ is the free-space wavelength at the center frequency). A prototype with ground plane size of around $1{{\lambda }_0} \times 1{{\lambda }_0}$ is fabricated and measured. Measurement result shows that the proposed design achieves an impedance bandwidth of 28.2% (1.67–2.22 GHz) for ${{\rm SWR} . A stable gain of $9.2 \pm 1.1 \hbox{dBi}$ is realized. The antenna has a unidirectional radiation pattern with low cross polarization ( $ ) and low back-radiation level ( $ ) across the operating frequency band.

A Magneto-Electric Dipole Antenna With Low-Profile and Simple Structure

By combining a horizontal planar dipole and a vertically oriented folded shorted patch antenna, a new low-profile magneto-electric dipole antenna is presented. The antenna is simply excited by a coaxial feed that works as a balun. A prototype was fabricated and measured. Simulated and measured results agree well. An impedance bandwidth of 45.6% for SWR ≤ 1.5 from 1.86 to 2.96 GHz was achieved. Stable radiation pattern with low cross polarization, low back radiation, and an antenna gain of 8.1 ± 0.8 dBi was found over the operating frequencies. The height of the antenna is only 0.169λ (where λ is the free-space wavelength at the center frequency). In addition, the antenna is dc grounded, which satisfies the requirement of many outdoor antennas.

A Low-Profile Magneto-Electric Dipole Antenna

A new low-profile magneto-electric dipole antenna composed of a horizontal planar dipole and a vertically oriented folded shorted patch antenna is presented. The antenna is simply excited by a coaxial feed without the need of an additional balun. A rectangular cavity-shaped reflector is introduced for enhancing the stability in radiation pattern over the operating frequencies. A parametric study is performed for providing practical design guidelines. A prototype with a thickness of 0.173λ was designed, fabricated and measured. Results show that an impedance bandwidth of 54.8% for SWR ≤ 1.5 from 1.88 to 3.3 GHz was achieved. Stable radiation pattern with low cross polarization, low back radiation and an antenna gain of 8.6 ± 0.8 dBi was found over the operating frequencies. In addition, the antenna is d.c. grounded, which satisfies the requirement of many outdoor antennas.