Circularly polarised printed crossed dipole antennas with broadband axial ratio

Baik, Jung-Woo; Lee, K. J.; Yoon, Won‐Sang; Lee, T. H.; Kim, Young Sik

doi:10.1049/el:20080794

Cited by 141 publications

(99 citation statements)

References 6 publications

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“…In free-space, a conventional crossed dipole produces bidirectional CP radiation in the broadside directions. In order to redirect a half of the radiation into the opposite direction, the crossed-dipole antennas are generally horizontally placed on a metallic reflector [14]. In addition, the operational bandwidth of conventional crossed dipoles can be broadened by loading parasitic elements [15,16] or by using an enlarged dipole [17,18].…”

Section: Introductionmentioning

confidence: 99%

Bandwidth-Enhanced Low-Profile Antenna with Parasitic Patches

Kedze

2017

International Journal of Antennas and Propagation

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This paper presents low-profile broadband antennas, which are composed of four parasitic patches placed between planar radiators and a perfect electric conductor ground plane. Two types of planar radiators, a conventional dipole and a crossed dipole, are employed to produce linearly polarized (LP) and circularly polarized (CP) radiations, respectively. The radiator and parasitic patches are realized on thin substrates to lower the cost. Owing to the presence of parasitic patches, the antenna performance improves in terms of profile reduction, resonant frequency decrease, and bandwidth enhancement. These improvements are discussed and confirmed computationally and experimentally. The LP design with the overall dimensions of 120 mm × 120 mm × 16.3 mm (0.64λ 0 × 0.64λ 0 × 0.087λ 0 at 1.6 GHz) has a |S 11 | < −10 dB bandwidth of 1.465-1.740 GHz (17.2%), a broadside gain of 8.5-8.8 dBi, and a radiation efficiency > 96%. The CP design, which has the same physical size as the LP case, has a |S 11 | < −10 dB bandwidth of 1.388-1.754 GHz (23.3%), a 3 dB AR (axial ratio) bandwidth of 1.450-1.685 GHz (15.0%), a right-hand CP broadside gain of 7.8-8.7 dBic, and a radiation efficiency > 90%.

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Section: Introductionmentioning

confidence: 99%

Bandwidth-Enhanced Low-Profile Antenna with Parasitic Patches

Kedze

2017

International Journal of Antennas and Propagation

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“…It has found wide applications in the consumer products due to its good characteristics and low cost, which has been comprehensively reported in several studies [1][2][3]. On the other hand, the circular polarization (CP) antennas [4][5][6][7][8][9][10][11][12][13][14] have become more and more popular not only in the satellite communications but also in the territorial communications. For example, CP antennas can be used in radio frequency identification (RFID) systems and global positioning system (GPS) to reduce power loss due to polarization mismatch.…”

Section: Introductionmentioning

confidence: 99%

A Coplanar-Strip Dipole Antenna for Broadband Circular Polarization Operation

Tsai¹

2011

PIER

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Abstract-A coplanar-strip dipole antenna with two enhanced features is presented for broadband circular polarization (CP) operation. The first feature of the proposed antenna is the replacement of a conventional thin dipole by a wide strip, resulting in two degenerated orthogonal modes to make CP operation possible. The second one is the use of two coplanar strips instead of two non-coplanar ones, thereby giving rise to the advantages of easy implement, good impedance matching, and wide axial ratio (AR) bandwidth. Two examples are given, one for the lower band around 1.8 GHz and the other for the ultra-wideband (UWB). For the lower band, the measured −10 dB return loss (RL) bandwidth is 119% (0.74 to 2.93 GHz), and the measured 3 dB AR bandwidth is 50% (1.45 to 2.41 GHz). As for UWB, the measured RL is below −10 dB between 2.1 to 10.1 GHz, and the measured AR is below 5 dB between 4.1 to 7.75 GHz.

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“…In recent, some papers [21][22][23] try to introduce circularly polarized radiation by modifying the conventional dipole antenna. Two dipoles [21,22] are fed by two transmission lines, individually, with a ninety-degree phase difference and the same amplitude to produce the circular polarization property.…”

Section: Introductionmentioning

confidence: 99%

“…Two dipoles [21,22] are fed by two transmission lines, individually, with a ninety-degree phase difference and the same amplitude to produce the circular polarization property. In paper [23], the circularly polarized operation is achieved by combining a dipole antenna with an artificial ground plane.…”

Section: Introductionmentioning

confidence: 99%

A Wideband Wide-Strip Dipole Antenna for Circularly Polarized Wave Operations

Chi¹,

Bor²,

Deng³

et al. 2010

PIER

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Abstract-A thin dipole antenna is a well-known antenna with linearly polarized wave operation. In this work, a wide-strip dipole antenna is proposed for circularly polarized wave operations. To obtain circularly polarized (CP) wave operations, there are two conditions to be satisfied. One is that the antenna must have two degenerated orthogonal modes with different resonant frequencies. The other is that the phase difference of two orthogonal modes is 90 degrees. To match the first condition, the slab width W is tuned to generate current distributions directed in two different directions. In addition, the second condition is matched by asymmetric feeding point by adjusting the overlapped square width C. The parametric study is completed by the Ansoft HFSS simulator. Simulated results reveal that the CP wave is mainly influenced by the slab width W . The influences of the parameters C and d on the performances of the proposed antenna are also investigated in this paper. Taking −8 dB as reference, there are two working bands for this proposed antenna and the measured center frequencies are 0.66 GHz and 2.04 GHz, respectively, and the corresponding bandwidths are 0.27 GHz (40%) and 1.78 GHz (87%), respectively. In addition, the measured center frequencies and bandwidths of the axial ratio are 1.94 GHz and 0.53 GHz (27%), respectively.Corresponding author: L.-P. Chi (cp531220@ms23.hinet.net). 70Chi et al.

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Circularly polarised printed crossed dipole antennas with broadband axial ratio

Cited by 141 publications

References 6 publications

Bandwidth-Enhanced Low-Profile Antenna with Parasitic Patches

Bandwidth-Enhanced Low-Profile Antenna with Parasitic Patches

A Coplanar-Strip Dipole Antenna for Broadband Circular Polarization Operation

A Wideband Wide-Strip Dipole Antenna for Circularly Polarized Wave Operations

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