Circularly Polarized Complementary Antenna With Tilted Beam Based on Orthogonal Dipoles

Zhang, Wenhai; Lu, Wen‐Jun; Tam, Kam‐Weng

doi:10.1109/lawp.2018.2848304

Cited by 13 publications

(10 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The tilt angle of the beam reaches up to 25° away from zenith (the z ‐axis) when the patch is connected to the shorted wall; otherwise, the beam is hardly tilted, as shown in Figure 7A. The resonance frequency is reduced because of the shorted wall, as also explained in the References , so this shorted wall acts as a reflector. Figure 8A shows the normalized radiation patterns for different lengths L1 of the ground.…”

Section: Antenna Design and Analysismentioning

confidence: 68%

A novel dual‐mode patch antenna with pattern diversity and beam‐tilting for aircraft applications

Yan

Jiao

Zhang

2020

Int J RF Microw Comput Aided Eng

View full text Add to dashboard Cite

A dual‐mode patch antenna with pattern diversity that is beam‐tilted in a specific direction is presented. By placing a rectangular metal cavity below the circular patch and simultaneously shorting one end of the patch, the antenna produces tilted beams for dual‐mode radiation patterns. One pattern is excited using a proximity‐fed L‐shaped probe that generates a beam with a tilt angle of 25° from the broadside direction. The second pattern is excited using a coplanar waveguide (CPW)‐based feeding network that generates two beams with a tilt angle of θmax = ±45° in the directions of ϕmax = 70° and − 70°. The tilt angle can be varied by adjusting the metal cavity's length. A prototype antenna for operation at 2.38 GHz was fabricated and measured. The results indicate that the overlapped bandwidth (|S11| < −10 dB) for the two patterns is 330 MHz (2.22‐2.55 GHz). The measured peak gains for the two patterns are 6.74‐6.94 dBi and 5.82‐6.74 dBi, respectively. The isolation between the two ports is 18 dB.

show abstract

Section: Antenna Design and Analysismentioning

confidence: 68%

A novel dual‐mode patch antenna with pattern diversity and beam‐tilting for aircraft applications

Yan

Jiao

Zhang

2020

Int J RF Microw Comput Aided Eng

View full text Add to dashboard Cite

show abstract

“…Then, according to our prior study, a shorting pin is employed to connect the monopole antenna and the ground plane, and thus a pair of orthogonally oriented complementary dipoles antenna, that is, z ‐oriented electric dipole and y ‐oriented magnetic dipole, is realized. It is demonstrated that the right‐handed circularly polarized (RHCP) and left‐handed circularly polarized (LHCP) waves can be generated in the tilted directions of ± 45° and ± 135° of yz ‐plane in Figure . These works are focused on the realization of CP radiation, but the controllable mechanism of CP properties, such as the tilted beam direction and 3‐dB AR beamwidth, are rarely discussed.…”

Section: Reader Antenna With Tilted Bi‐sense Beam Propertymentioning

confidence: 99%

“…Recently, an althernative of using orthogonally oriented complementary dipoles for CP radiation is proposed and tested. 15,16 Based on the previous investigations, design approach of tilted bi-sense CP antenna is presented to fullfil the abovementationed requirements, and two main contributions are demonstrated in this article. Firstly, the tunability mechanism of CP perforamcnes, including 3-dB axial ratio (AR) beamwidth and tilted beam direction, is investigated.…”

Section: Introductionmentioning

confidence: 99%

Tilted bi‐sense circularly‐polarized antenna and its application for radio frequency identification system

Zhang

Tam

et al. 2020

Int J RF Microw Comput Aided Eng

Self Cite

View full text Add to dashboard Cite

A tilted bi‐sense circularly polarized (CP) antenna and its application for UHF radio frequency identification (RFID) system is proposed. A planar concial monopole working as the electric dipole is designed at first. When a shorting pin is added, a loop radiator would be generated, and thus a pair of orthogonally oriented complementary dipoles is realized. In this way, both right‐handed circularly polarized (RHCP) and left‐handed circularly polarized waves (LHCP) are generated simultaneously in tilted directions within one hemisphere. Then, closed‐form formulas are derived to reveal the tunability mechanism of bi‐sense property and provide a design guideline for system application. It is demonstrated that flare angle of conical monopole has a linear relationship and sine function to CP beam direction and 3‐dB axial ratio (AR) beamwidth, respectively. Finally, antenna prototypes are fabricated and tested for validation. It is also demonstrated that at the tilted direction of θ = ± 45°, a 3‐dB AR bandwidth of 4.9%, and gain up to 5 dB are realized. Comparing with conventional microstrip patch antenna, an enhanced reading range over 5 m can be obtained in the tilted range from 40° to 75° and − 75° to −40° in UHF RFID sytem application.

show abstract

“…Previous research proposed techniques to realize wideband CP antennas [6][7][8][9][10][11][12][13][14]. In [6], a CP slot antenna was proposed, and the antenna could achieve a fractional CP bandwidth (FCPBW) over 40% and 3-dB AR bandwidth of 48%.…”

Section: Introductionmentioning

confidence: 99%

“…In [9], a simple rotational symmetric printed bow-tie dipole structure was proposed for frequency-selective polarization antenna (FSPA), and the antenna could achieve impedance bandwidth of 1.9 -5.65 GHz (98.7%) and 3-dB AR bandwidths of 8.3% (2.3 -2.5 GHz) and 13.3% (4.9 -5.6 GHz). In [10], a novel antenna was proposed to achieve bidirectionally tilted circular polarization. In [11], a CP monopole antenna based on natural boundary conditions was proposed and could achieve 3-dB AR bandwidths of 5.38% and 2.84%.…”

Section: Introductionmentioning

confidence: 99%

Single-Fed Broadband CP Bidirectional Antenna with Double-Layer Diagonally Aligned Plates for Universal UHF-RFID Applications

Dentri

Pookkapund

Luadang

et al. 2020

International Journal of Antennas and Propagation

View full text Add to dashboard Cite

This research proposes a single-fed broadband circularly polarized (CP) bidirectional antenna operable in 840–960 MHz frequency band for readers of universal UHF-RFID applications. The proposed antenna is comprised of upper-layer conductor, lower-layer conductor, and wall patches. The upper-layer conductor consists of two diagonally aligned rectangular copper plates with a feeding gap at the center, and the lower-layer conductor is of two diagonally adjoined rectangular plates. The upper- and lower-layer conductors are adjoined with the wall patches. The diagonal alignment technique of the upper- and lower-layer plates was used to realize circular polarization and improve 3-dB axial ratio (AR) bandwidth. The double layers were deployed to improve impedance bandwidth (|S11| < −10 dB) and achieve bidirectional radiation pattern. The simulated impedance bandwidth and 3-dB AR bandwidth were 772.19–1014.6 MHz (27.13%) and 675–1000 MHz (38.80%), and the corresponding measured results were 759–1011 MHz (28.47%) and 648–1110 MHz (52.55%). The simulated LHCP/RHCP half-power beamwidth (HPBW), 3-dB AR beamwidth, and gain were 56° – 90°/54° – 92°, 60° – 104°, and 4.94 – 5.89 dBic, while the corresponding measured results were 52° – 98°/62° – 97°, 96° – 126°, and 4.28 – 5.72 dBic. As a result, the single-fed broadband CP bidirectional antenna is applicable to universal UHF-RFID readers. Besides, the novelty of this research lies in the use of diagonal alignment of conducting plates to achieve circular polarization and wider AR bandwidth.

show abstract

Circularly Polarized Complementary Antenna With Tilted Beam Based on Orthogonal Dipoles

Cited by 13 publications

References 21 publications

A novel dual‐mode patch antenna with pattern diversity and beam‐tilting for aircraft applications

A novel dual‐mode patch antenna with pattern diversity and beam‐tilting for aircraft applications

Tilted bi‐sense circularly‐polarized antenna and its application for radio frequency identification system

Single-Fed Broadband CP Bidirectional Antenna with Double-Layer Diagonally Aligned Plates for Universal UHF-RFID Applications

Contact Info

Product

Resources

About