VHF/UHF Ultrawideband Slim Monopole Antenna With Parasitic Loadings

Qin, Dongjie; Sun, Baohua; Zhang, Rui

doi:10.1109/lawp.2022.3190015

Cited by 11 publications

(4 citation statements)

References 15 publications

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“…9-11 Also, lumped elements are used in the monopole antenna to improve bandwidth. 12,13 Shorting pins and inductive loading, NRI-TL Metamaterial loading are also used to expand antenna's bandwidth, 14,15 and other methods are used to expand the bandwidth of the antenna. These technical methods have achieved certain results in miniaturization and bandwidth expansion of antenna.…”

Section: Introductionmentioning

confidence: 99%

Design of Ka‐band, broadband, omnidirectional, with a top metal disk antenna

Wang,

Lu,

et al. 2023

Micro & Optical Tech Letters

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In this report, a Ka‐band, broadband, omnidirectional, with a top metal disk antenna is proposed. The antenna is fed by an air waveguide. The TE10 mode of the waveguide can efficiently be converted into an air coaxial TEM mode by a compact waveguide air coaxial transition. After matching and adjusting, the dielectric substrate is loaded and then transited to the metal radiation structure loaded with a top metal disc to obtain omnidirectional electromagnetic waves efficiently converted to free space. By optimizing the sizes of waveguide to air‐coaxial transition structure and disk, and so on, a good broadband omnidirectional antenna performance is finally achieved. The measured fractional impedance bandwidth is larger than 30% with the reference of S11 dB, which fully verifies the rationality of the design. In addition, measured patterns at the plane of different azimuth angles almost coincide with each other, which shows an excellent omnidirectional pattern.

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Section: Introductionmentioning

confidence: 99%

Design of Ka‐band, broadband, omnidirectional, with a top metal disk antenna

Wang,

Lu,

et al. 2023

Micro & Optical Tech Letters

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“…However, the antenna has a dimension of 0:25λ × 0:25λ at the minimum frequency and therefore is too large for handset application. In [4], a slim monopole antenna with two parasitic strips on both sides is presented. By adding novel in-body structures to the three strips, it can achieve wider impedance and radiation pattern bandwidths.…”

Section: Introductionmentioning

confidence: 99%

Design of Miniaturized Dual-Mode Antenna for Handset Terminal Communication

Zhang

Shi

Zhang

et al. 2023

International Journal of RF and Microwave Computer-Aided Engine

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This paper presents a miniaturized dual-mode handset antenna design. A quadrifilar helix antenna (QHA) is utilized to work at higher band (1980-2010 MHz and 2170-2200 MHz) with circular polarization. By cutting off a circular slot on the outer conductor of the QHA feedline and introducing four quarter-wavelength short-circuited stubs, the QHA radiator and its feedline can also work as a monopole antenna at lower band (440-560 MHz) with linear polarization. With this radiator-sharing technique, the dual-mode characteristics can be achieved utilizing only a QHA; therefore, the antenna dimension can be reduced remarkably since it is unnecessary to design an additional monopole antenna. Moreover, the short-circuited stubs are designed with stripline and integrated with the one-to-four power divider and phase shifter for further miniaturization. The measured S11 is less than -8 dB. The typical gain is higher than 0.5 dBi at lower band and 2.5 dBi at higher band. The AR of the QHA is better than 1.3 dB, and the head SAR values are much lower than the international standard at both lower and higher bands. The proposed miniaturized dual-mode antenna can be applied to portable handsets to realize the intercom and satellite communications.

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“…The Vivaldi structure, introduced in [9], yielded a bandwidth of 123%, while a CPW feeding line was employed in [10]. In [11], a monopole with three parallel strips specifically designed for backpack applications produced a bandwidth of 124.8% and a lightweight structure. Additionally, an inverted cone monopole with a wide bandwidth ranging from 1 to 4 GHz was presented in [12].…”

Section: Introductionmentioning

confidence: 99%

Wideband Omnidirectional Antenna Featuring Small Azimuthal Gain Variation

Zhang,

Fu,

et al. 2023

Micromachines

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Wideband omnidirectional antennas are essential components in radio monitoring and communication systems, enabling the reception of signals from all directions over a wide bandwidth. This paper presents a novel wideband omnidirectional antenna design that achieves a 1-dB gain variation across its azimuthal plane within a bandwidth of 1.8 GHz to 7.77 GHz. The antenna’s exceptional performance is attributed to two flower-bud-shaped monopoles that, through pattern superposition, generate a wideband omnidirectional radiation pattern. Analysis shows that the use of a circular ground plane also reduces the azimuthal gain variation. Additionally, an embedded matching structure integrated into the antenna’s base enhances the impedance bandwidth without compromising its compact size. Analytical investigations demonstrate that the matching structure effectively behaves as a five-order LC circuit, explaining its wideband matching capabilities. Furthermore, structural modifications effectively reduce side lobe levels, ensuring minimal interference. Experimental measurements corroborate the antenna’s omnidirectional radiation pattern and confirm that the azimuthal gain variation remains within 1-dB throughout its bandwidth, while maintaining an S11 below −10 dB from 1.8 GHz to 7.7 GHz. The antenna’s bandwidth overlaps with the spectrum intensively used in mobile communication technologies, such as LTE, Bluetooth, and IEEE 802.11be, as well as radiolocation applications, making it a promising choice for unmanned aerial vehicles conducting communication and radio monitoring missions.

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VHF/UHF Ultrawideband Slim Monopole Antenna With Parasitic Loadings

Cited by 11 publications

References 15 publications

Design of Ka‐band, broadband, omnidirectional, with a top metal disk antenna

Design of Ka‐band, broadband, omnidirectional, with a top metal disk antenna

Design of Miniaturized Dual-Mode Antenna for Handset Terminal Communication

Wideband Omnidirectional Antenna Featuring Small Azimuthal Gain Variation

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