A High-Directivity, Wideband, Efficient, Electrically Small Antenna System

Tang, Maochun; Ziolkowski, Richard W.; Xiao, Shaoqiu; Li, Mei

doi:10.1109/tap.2014.2361891

Cited by 37 publications

(20 citation statements)

References 26 publications

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“…The first is the placement of an effective medium beneath the radiator that acts as an in-phase reflector, such as reactive impedance surface (RIS) substrates [20]; electromagnetic band gap (EBG) structures [21], [22]; and meanderline-shaped slot-structured conductor discs [23], [24]. The second is the arrangement of two, three or more radiators with similar structures, e.g., monopoles [25]- [29]; electrical dipoles [30], [31]; magnetic dipoles [32]; and ESAs [33], [34]; into an array to realize quasi-Yagi endfire configurations. The third is the construction of Huygens sources using pairs of electric and magnetic resonators/dipoles [35]- [38].…”

mentioning

confidence: 99%

Design and Testing of Simple, Electrically Small, Low-Profile, Huygens Source Antennas With Broadside Radiation Performance

Tang

Wang

Ziolkowski

2016

IEEE Trans. Antennas Propagat.

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108

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The efficacy of a simple, electrically small, low-profile, Huygens source antenna that radiates in its broadside direction is demonstrated numerically and experimentally. First, two types of electrically small, near field resonant parasitic (NFRP) antennas are introduced and their individual radiation performance characteristics are discussed. The electric one is based on a modified Egyptian axe dipole NFRP element; the magnetic one is based on a capacitively loaded loop (CLL) NFRP element. In both cases the driven element is a simple coax-fed dipole antenna, and there is no ground plane. By organically combining these two elements, Huygens source antennas are obtained. A forward propagating demonstrator version was fabricated and tested. The experimental results are in good agreement with their analytical and simulated values. This low profile, ~ 0.05 λ 0 , and electrically small, ka = 0.645, prototype yielded a peak realized gain of 2.03 dBi in the broadside direction with a front-to-back ratio (FTBR) of 16.92 dB. A backward radiating version is also obtained; its simulated current distribution behavior is compared to that of the forward version to illustrate the design principles.Index Terms -Broadside directivity, electrically small antennas, Huygens source, low profile, metamaterial-inspired structures, near field resonant parasitic antennas.

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mentioning

confidence: 99%

Design and Testing of Simple, Electrically Small, Low-Profile, Huygens Source Antennas With Broadside Radiation Performance

Tang

Wang

Ziolkowski

2016

IEEE Trans. Antennas Propagat.

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108

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“…It is observed at this frequency point that there is also a certain amount of current on the two parasitic SSRR surfaces. The reason is that the patch's resonance has a certain overlap with the other two, as one watches that there are also strong currents flowing on the SSRR elements .…”

Section: Antenna Configuration and Performancementioning

confidence: 99%

Bandwidth enhancement of dual‐layer patch antenna using low mutual‐coupling near‐field resonant parasiticl elements

Tang

et al. 2016

Micro & Optical Tech Letters

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A pair of face‐to‐face semicircular split‐ring resonators (SSRRs) was utilized to improve the impedance bandwidth of a planar patch antenna. By loading the SSRRs on the superstrate layer, their fundamental resonant modes could be capacitively induced by the radiation patch of the antenna underneath them, respectively. Benefitting from the ultra‐low mutual coupling level between the SSRRs even though their resonant modes are very close to each other, their resonant frequency ranges could be merged with the resonant frequency range from the fundamental mode of the radiation patch to produce a wide fractional impedance bandwidth as high as 4.2% (witnessing 5.16 times enhancement compared with that of a standard patch antenna), even with such a low profile (only 0.052λ0 height). Moreover, the experimental results, which are in good agreement with the simulation values, demonstrated its stable and excellent radiation characteristics, including strict broadside main beams with high polarization purity and large front‐to‐back ratios over the entire operational bandwidth. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:180–186, 2017

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“…An antenna is considered as an ESA if it can be completely enclosed within a radian sphere [2]. A general characteristic of ESAs is that they operate in the fundamental dipole mode because of the ESAs possess small physical sizes in term of their operational wavelengths [3]. Therefore, a challenge in designing ESA is to achieve a directional radiation pattern.…”

Section: Introductionmentioning

confidence: 99%

“…In order to address this issue, several ways of developing directive ESAs have been proposed. These ways, for instance, include: using electrically small reflectors [3][4][5] or directors [6], associating with ground plane [7,8], arranging ESA elements in linear array [9], and constructing Huygens source antennas [10][11][12]. On the other hand, it well known that circularly polarized (CP) radiation has been used to combat multi-path interferences or fading, mitigate polarization mismatch losses, and reduce Faraday rotation effects caused by the ionosphere.…”

Section: Introductionmentioning

confidence: 99%

Electrically-Small Circularly-Polarized Quasi-Yagi Antenna

Ta¹

2018

PIER Letters

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Abstract-In this letter, an electrically-small circularly polarized (CP) quasi-Yagi antenna is presented. It is composed of three elements; i.e., a compact single-feed crossed-dipole antenna acted as the driver and two parasitic elements acted as the reflector and director, respectively. Each arm of all elements contains a meander line with an arrowhead ending to realize compactness. The driver has double vacant-quarter printed rings incorporated into it to generate the CP radiation. The parasitic elements are incorporated with the crossed-dipole driver to not only produce a directive radiation, but also broaden the antenna bandwidth. The final design with overall size of 35 mm × 35 mm × 27 mm (0.184λ o × 0.184λ o × 0.142λ o at 1.575 GHz, ka = 0.93) a measured 10-dB bandwidth of 19.23% (1.476-1.790 GHz), 3-dB axial ratio bandwidth of 7.67% (1.505-1.625 GHz), a broadside gain of 3.0 ± 0.2 dBic, and the maximum front-to-back ratio of 8.2 dB. The proposed antenna is applicable to a variety of wireless system operating near 1.575 GHz, such as Global Positioning Systems, Global Navigation Satellite Systems, as well as international maritime satellite organization (Inmarsat) networks.

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A High-Directivity, Wideband, Efficient, Electrically Small Antenna System

Cited by 37 publications

References 26 publications

Design and Testing of Simple, Electrically Small, Low-Profile, Huygens Source Antennas With Broadside Radiation Performance

Design and Testing of Simple, Electrically Small, Low-Profile, Huygens Source Antennas With Broadside Radiation Performance

Bandwidth enhancement of dual‐layer patch antenna using low mutual‐coupling near‐field resonant parasiticl elements

Electrically-Small Circularly-Polarized Quasi-Yagi Antenna

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