Abstract
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.
Highlights
A magneto-electric (ME) dipole antenna is a type of complementary antenna that consists of an electric dipole (formed by a horizontal planar half-wave dipole) and a magnetic dipole (formed by a vertical shorted quarter-wave patch) placed orthogonally
A magneto-electric (ME) dipole antenna is a type of complementary antenna that consists of an electric dipole and a magnetic dipole placed orthogonally
Compared to the other low-profile wideband antennas, such as a slot-loaded patch antenna [18], a slot-fed dipole-patch antenna [19], a hybrid metasurface antenna [20], and a differentially-fed patch antenna [21], the proposed antenna has the advantages of wider impedance bandwidths (IBWs) and higher front-to-back ratio (FBR)
Summary
A magneto-electric (ME) dipole antenna is a type of complementary antenna that consists of an electric dipole (formed by a horizontal planar half-wave dipole) and a magnetic dipole (formed by a vertical shorted quarter-wave patch) placed orthogonally. S. Trinh-Van et al.: Bandwidth-Enhanced Low-Profile ME Dipole Antenna With Shorting Parasitic Elements were decreased to 0.173λ0 and 0.169λ0, while the impedance bandwidths (IBWs) in cases for which VSWR < 1.5 for these antennas were 54.8% and 53.6%, respectively. An ME dipole antenna with a low profile of 0.116λ0 that utilizes a pair of -shaped shorted patches was presented, reportedly showing an IBW of 43.6% [16].
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