Omnidirectional Circularly Polarized Antenna Combining Monopole and Loop Radiators

Li, Bo; Liao, Shaowei; Xue, Quan

doi:10.1109/lawp.2013.2255578

Cited by 79 publications

(50 citation statements)

References 4 publications

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“…In the design, the monopole mode of the patch antenna is excited by the disk-loaded coaxial probe for generating the E θ field, and the Γ-shaped strips are utilized to achieve the E ϕ field. Omnidirectional CP radiation pattern is obtained once the two orthogonal fields are equal in amplitude but in phase quadrature [18,21,22]. The E θ and E ϕ fields can be expressed as: where I d and I l are the currents on the probe or the shorting pins and the curved strips, respectively.…”

Section: Antenna Design and Discussionmentioning

confidence: 99%

“…In [11], a low-profile omnidirectional CP antenna is proposed which consists of a top-loaded cylindrical monopole and four printed arc-shaped dipoles. In [12], the presented antenna uses a monopole and a loop radiator to achieve omnidirectional CP property. Based on the ZOR of the MTL and curved branches, a novel omnidirectional CP antenna is reported in [13].…”

Section: Introductionmentioning

confidence: 99%

“…Based on the ZOR of the MTL and curved branches, a novel omnidirectional CP antenna is reported in [13]. Though the single-fed CP antennas in [11][12][13] are in low profile, they typically have narrow 10-dB impedance bandwidths (less than 14%). Additionally, dual-band omnidirectional CP antennas are investigated either by using the ZOR and FOR modes of the MTL [14] or by using the TM 01 and TM 02 modes of the microstrip antenna [15].…”

Section: Introductionmentioning

confidence: 99%

“…The antenna consists of a square patch fed by coaxial probe and modified Γ-shaped strips with shorting pins. Though the antennas in [11][12][13] use a similar configuration, they provide only a narrow bandwidth since just one resonance is excited. In this paper, a multi-resonant structure is adopted by adding an inner Γ-shaped strip inside the outer one, and as a result, the proposed antenna achieves another resonance of the monopole mode and provides a wide bandwidth.…”

Section: Introductionmentioning

confidence: 99%

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Wideband Omnidirectional Circularly Polarized Patch Antenna With Multi-Resonant Structure

Yang¹,

Zhang²,

Ji³

et al. 2017

PIER C

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Abstract-A wideband omnidirectional circularly polarized (CP) patch antenna is proposed in this paper. The proposed antenna is composed of a disk-loaded coaxial probe and four pairs of modified Γ-shaped strips loaded with shorting pins. Each pair of modified Γ-shaped strips consists of an inner Γ-shaped strip and an outer Γ-shaped strip. The approach employed in this design for improving the operating bandwidth is to add an inner Γ-shaped strip and make it couple to the outer one. By introducing the two coupled Γ-shaped strips, two different monopole modes can be achieved simultaneously and controlled separately by two different corresponding parts of these two Γ-shaped strips, respectively, and they can be merged to realize a wide-band impedance matching. Meanwhile, two minimum axial ratio (AR) points around the resonances of the antenna are excited by the coupled Γ-shaped strips, and they can be reallocated closely to each other for wide AR bandwidth. The measured results show that the proposed design has a 10-dB impedance bandwidth of 22.7% (2.26-2.84 GHz), 3-dB AR bandwidth of 33.6% (2.1-2.95 GHz) and low profile of 0.1λ 0 (λ 0 is the free-space wavelength at center frequency). In addition, a parametric discussion is conducted to further verify the proposed design.

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Section: Antenna Design and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Wideband Omnidirectional Circularly Polarized Patch Antenna With Multi-Resonant Structure

Yang¹,

Zhang²,

Ji³

et al. 2017

PIER C

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show abstract

“…A new omnidirectional circularly polarized (CP) antenna with good performance has been proposed [3]. However, the antenna size is quite large with the diameter of around 0.5λ 0 .…”

Section: Introductionmentioning

confidence: 99%

A Compact Multiband Omnidirectional GNSS Antenna for Artillery Projectiles Applications

Liu¹,

Sun²,

Zhou³

et al. 2016

PIER C

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Abstract-A compact multiband omnidirectional antenna for the reception of GNSS signals on artillery projectiles is designed in this paper. The proposed antenna consists of a metallic cone comprising a T-shaped monopole. It exhibits a broad bandwidth from 1.22 GHz to 1.28 GHz and from 1.44 GHz to 1.75 GHz, covering GPS L1, Galileo E2-L1-E1, GLONASS G1 and G2, CNSS B1 and B3. Measured results show that an omnidirectional radiation pattern is achieved, and the non-circularity in the azimuthal plane (xy-plane) is less than 2 dB for all the desired bands. Then the measured 6 dB beamwidth is about 110 • in the presence of a finite 20 millimeters (mm) radius ground plane. Such an antenna has the potential to be easily used for small artillery projectiles.

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Investigation on a compact wideband omnidirectional circularly polarized antenna in an indoor propagation channel for 2.4 GHz application

Emadian,

Ghobadi

2024

Int J Communication

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SummaryIn this paper, for the first time, the capability of a compact low‐cost wideband omnidirectional circularly polarized (CP) antenna to suppress multipath fading characteristics in a typical indoor propagation channel for 2.4 GHz applications is investigated. A ray tracing method based on the geometrical optics and uniform theory of diffraction is applied to analyze an indoor propagation channel using the measured radiation patterns of the proposed antenna. The design uses a conventional monopole antenna with a circular ground plane to generate a vertically polarized electric field. Sequentially flag‐shaped stubs are then added to the ground plane to produce horizontally polarized electric field and to improve the impedance bandwidth of the proposed antenna. The antenna is designed for 2.4 GHz WLAN application with 10 dB impedance bandwidth of 25.5% and 3 dB axial ratio (AR) bandwidth of 24.5%. The polarization can be readily changed between the left‐hand circular polarization (LHCP) and right‐hand circular polarization (RHCP) by altering the direction of the coaxial probe (monopole) or varying the orientation of the printed bended stubs. Both the LHCP and RHCP prototypes of the proposed antenna are designed, fabricated, and tested, and the similar results are obtained.

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Omnidirectional Circularly Polarized Antenna Combining Monopole and Loop Radiators

Cited by 79 publications

References 4 publications

Wideband Omnidirectional Circularly Polarized Patch Antenna With Multi-Resonant Structure

Wideband Omnidirectional Circularly Polarized Patch Antenna With Multi-Resonant Structure

A Compact Multiband Omnidirectional GNSS Antenna for Artillery Projectiles Applications

Investigation on a compact wideband omnidirectional circularly polarized antenna in an indoor propagation channel for 2.4 GHz application

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