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Author

Lianghao Yuan

Bio: Lianghao Yuan is an academic researcher from Huaqiao University. The author has contributed to research in topics: Dipole antenna & WiMAX. The author has an hindex of 2, co-authored 2 publications receiving 7 citations.

Papers
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01 Aug 2017
TL;DR: In this paper, the horizontal size of the proposed antenna is reduced by adding vertical metallic strips at the end of the driver and reflector, and the 1/4 wavelength transformer and balun are placed horizontally to reduce the vertical size.
Abstract: This paper presents a novel miniaturezation Quasi Yagi-Uda antenna based capacitive loading technique and new layout. In the proposed antenna, the horizontal size of the proposed antenna is reduced by adding vertical metallic strips at the end of the driver and reflector. Meanwhile, the 1/4 wavelength transformer and balun are placed horizontally to reduce the vertical size. In this way, the overall dimensions of the proposed antenna could be decrease without much loss in other performance indicators. Then the parameters of the antenna is optimized by the software HFSS. The measurement results exhibit that the proposed antenna has a good VSWR from 902MHz to 928MHz and its gain is about 5.8dBi at 915MHz. And the overall size of proposed antenna is 110mm∗105mm that is around λ/3 × λ/3 where λ is the wavelength of the centre frequency.

5 citations

Proceedings ArticleDOI
01 Nov 2017
TL;DR: A miniaturized broadband Quasi-Yagi antenna which adopt new compact layout and modified bowtie driven dipole and ground patch which can be used for wireless communications and recognitions like WLAN, RFID, WiMAX and LTE is presented.
Abstract: This paper presents a miniaturized broadband Quasi-Yagi antenna which adopt new compact layout and modified bowtie driven dipole. In the proposed antenna, the micro strip feed and λ/4 impedance transformer are placed horizontally to reduce the vertical size. Meanwhile, in order to reduce the horizontal size, the vertical metallic strips are loaded to the end of bowtie driven dipole and ground patch. Compared to the conventional Quasi-Yagi antenna, the overall size of the proposed antennas are reduced about approximately 50%. The measured results show that the impedance bandwidth (reflection coefficient< −10dB) of proposed antenna is 1.16GHz (42.6%) for 2.14–3.3GHz and it has a wide bandwidth about 2.23–3.25GHz with reflection coefficient<-15dB. Moreover, the realized gain is around 4dBi in the operating bandwidth. This antenna can be used for wireless communications and recognitions like WLAN, RFID, WiMAX and LTE.

2 citations


Cited by
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Journal ArticleDOI
TL;DR: A novel concept on the design of a broadband printed Yagi antenna for S-band wireless communication applications is presented and its characteristics, such as reflection coefficient, radiation pattern, and gain, are compared with simulation results.
Abstract: In this paper, a novel concept on the design of a broadband printed Yagi antenna for S-band wireless communication applications is presented. The proposed antenna exhibits a wide bandwidth (more than 48% fractional bandwidth) operating in the frequency range 2.6 GHz–4.3 GHz. This is achieved by employing an elliptically shaped coupled-directive element, which is wider compared with other elements. Compared with the conventional printed Yagi design, the tightly coupled directive element is placed very close (0.019λ to 0.0299λ) to the microstrip-fed dipole arms. The gain performance is enhanced by placing four additional elliptically shaped directive elements towards the electromagnetic field’s direction of propagation. The overall size of the proposed antenna is 60 mm × 140 mm × 1.6 mm. The proposed antenna is fabricated and its characteristics, such as reflection coefficient, radiation pattern, and gain, are compared with simulation results. Excellent agreement between measured and simulation results is observed.

4 citations

Proceedings ArticleDOI
01 Dec 2019
TL;DR: In this article, a single zero compensation dipole antenna for WLAN frequency band is designed, and the antenna can be suspended above the space and the radiation range can cover the whole space below.
Abstract: In this paper, a single zero compensation dipole antenna for WLAN frequency band is designed. The antenna can be suspended above the space and the radiation range can cover the whole space below. The antenna is fed by the parallel transmission lines, and the radiation unit consists of a printed dipole antenna and a Yagi antenna. The printed dipole antenna is printed on both sides of the FR-4 dielectric substrate with relative permittivity of 4.3. The printed dipole antenna adopts complementary symmetry structure to optimize the non-roundness of H plane. The driver arms of the Yagi antenna are printed on both sides of the substrate, while the director and the reflector of the Yagi antenna are located in the dielectric substrate to compensate the zero point of the dipole antenna. The simulation results show that the VSWR of the antenna is less than 2 in the 2.32-2.45 GHz band. The maximum directivity is more than 1.8 dBi in the 2.322.45GHz band. The non-roundness of the H plane of the antennais less than 2dB,which shows good omni-directivity. A zero point in the radiation pattern of the E plane is compensated, and it is -1.68dBi at 2.36GHz,0.62dBi at 2.4GHz and 0.48dBi at 2.44 GHz, respectively, while the other zero point of the E plane remains below -12 dBi in the working frequency range, namely realizing the function of single zero compensation.

1 citations

Patent
19 May 2020
TL;DR: In this article, a dipole antenna with single zero point compensation was proposed, which can achieve the purposes that the antenna is suspended above the space, and the radiation range covers the periphery and the lower portion of the whole space.
Abstract: The invention discloses a dipole antenna with single zero point compensation. The dipole antenna comprises a dielectric substrate, and a dipole antenna and a microstrip yagi antenna which are arrangedon the dielectric substrate. According to the dipole antenna, dipole arms are arranged on the front surface and the back surface of the dielectric substrate; the dipole arms on the front surface andthe back surface of the dielectric substrate are connected; the dipole arm on the front surface of the dielectric substrate and the dipole arm on the back surface of the dielectric substrate adopt a double-array symmetrical structure; the dipole antenna can perform omnidirectional radiation on an H surface, and a feed port is led out of the dipole antenna; and the microstrip yagi antenna is used for compensating a radiation zero point of the E surface of the dipole antenna in a strong directivity manner in the direction of a director of the microstrip yagi antenna. The dipole antenna with single zero point compensation can achieve the purposes that the antenna is suspended above the space, and the radiation range covers the periphery and the lower portion of the whole space.
Proceedings ArticleDOI
01 Mar 2019
TL;DR: In this paper, a conventional patch antenna with defected ground plane structure to operate under 3.4 and 4.6 GHz frequencies suitable for wireless terminal devices in WiMAX and extended C band applications is presented.
Abstract: This article introduces a conventional patch antenna with defected ground plane structure to operate under 3.4 and 4.6 GHz frequencies suitable for wireless terminal devices in WiMAX and extended C band applications. The antenna is designed on a 20 × 20 × 1.6 mm3 FR-4 substrate. A 7x4 array of Triangular shaped interconnected Closed Loop Structures (TCLS) are etched on the ground plane which behaves as a metamaterial in the 4.5GHz frequency range. This property of metamaterial contributes in creating a narrow band response along with the patch antenna resonance. Over the entire operating region, an omnidirectional and bidirectional radiation pattern are observed in the orthogonal planes.