Single feed circularly polarised omnidirectional bifilar helix antennas with wide axial ratio beamwidth

Amin, Muhammad; Yousaf, Jawad; Iqbal, Sana

doi:10.1049/iet-map.2012.0630

Cited by 23 publications

(7 citation statements)

References 34 publications

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“…The conventional loop [23][24][25][26][27] or helical/helix shaped [28][29][30] antennas used as magnetic field antennas cannot produce the required high magnetic field intensity with the constraint of the low input feed power for the near-field magnetic field testing as per the NFIT setup of Figure 2. The embedding of high permeability materials such as ferrites in the antenna structure (sandwiching between the antenna radiator and ground plane as in [31,32]) could enhance the intensity of the generated magnetic field by the antenna.…”

Section: Design and Simulationmentioning

confidence: 99%

Near-Field Immunity Test Method for Fast Radiated Immunity Test Debugging of Automotive Electronics

et al. 2019

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This study presents a near-field immunity test (NFIT) method for the fast debugging of radiated susceptibility of industrial devices. The proposed approach is based on the development of an NFIT setup which comprises of developed near-field electric and magnetic field probes and device under test (DUT). The developed small-size and handy near-field testing probes inject the high electric (up to 1000 V/m) and magnetic (up to 2.4 A/m) fields on the DUT in the radar pulse ranges (1.2 to 1.4 GHz and 2.7 to 3.1 GHz) with the lower fed input power (up to 15 W) from the power amplifier in the developed NFIT setup. The proof of concept is validated with the successful near-field immunity debugging of an electric power steering (EPS) device used in the automotive industry with the developed NFIT setup. The radiated susceptibility debugging test results of developed NFIT method and conventional method of ISO 11452-2 test setup turned out to be close to each other for the tested DUT in immunity performance. The proposed procedure has advantages of industry usefulness with fast, handy, and cost-effective radiated immunity debugging of the DUT without the requirement of large antenna, high-power amplifiers, optical DUT connecting harness, and an anechoic chamber as needed in ISO 11452-2 standard setup for the debugging analysis.

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Section: Design and Simulationmentioning

confidence: 99%

Near-Field Immunity Test Method for Fast Radiated Immunity Test Debugging of Automotive Electronics

et al. 2019

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“…The proposed antenna possesses similar design concepts to the single feed bifilar helix antenna (SFBHA), which was presented first by Amin's group in 2007. A simple rectangular loop antenna is twisted in a specific turn angle to produce an omnidirectional pattern for slant 45 • linear polarization [18] or circular polarization [19,20]. On the other hand, two orthogonal loops (a general form of slot) are employed in this turnstile slot antenna.…”

Section: Operation Principlementioning

confidence: 99%

A Slim Horizontally Polarized Omnidirectional Antenna Based on Turnstile Slot Dipole

Chin¹,

Jou²

2014

PIER C

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Abstract-A novel horizontally polarized (HP) antenna with omnidirectional pattern is presented in this paper. The proposed antenna applies the concept of rotating electric field method to conventional slot dipoles. Two CPW-fed slot dipoles are placed in a perpendicularly conjugate form. By properly arranging the magnitude and phase of input signals, the omnidirectional pattern can be synthesized at broadside. A prototype is developed at the 2.6 GHz band, which offers a horizontally polarized omnidirectional radiation pattern with gain of 2.5-3.4 dBi, and the measured antenna efficiency is greater than 73% through the operating band (2.4-2.8 GHz). Furthermore, a 20-dB polarization purity is achieved in this design. The overall volume of the proposed antenna is 22 × 22 × 90 mm 3 (0.19λ 0 ×0.19λ 0 ×0.78λ 0 ). Distinct from the other proposed HP antennas provided with planar geometry, this antenna is slim in shape, and it can be readily integrated with vertical dipoles to form a polarization diversity system in current wireless router and AP applications.

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“…Also, they can suppress the multi-path effects caused by nearby circumstance [1][2][3]. Thus, the omnidirectional CP antennas are good candidates for various wireless systems [4].…”

Section: Introductionmentioning

confidence: 99%

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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Single feed circularly polarised omnidirectional bifilar helix antennas with wide axial ratio beamwidth

Cited by 23 publications

References 34 publications

Near-Field Immunity Test Method for Fast Radiated Immunity Test Debugging of Automotive Electronics

Near-Field Immunity Test Method for Fast Radiated Immunity Test Debugging of Automotive Electronics

A Slim Horizontally Polarized Omnidirectional Antenna Based on Turnstile Slot Dipole

Wideband Omnidirectional Circularly Polarized Patch Antenna With Multi-Resonant Structure

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