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Author

Yuanxu Fu

Bio: Yuanxu Fu is an academic researcher from Kunming University of Science and Technology. The author has contributed to research in topics: Antenna measurement & Computer science. The author has co-authored 1 publications.

Papers
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Journal ArticleDOI
TL;DR: In this paper, an effective analysis method based on the proposed simplified formulas combined with full-wave simulation is given in order to realize the broadband characteristic of GaAs Schottky-diode-based mixers.
Abstract: To realize the broadband characteristic of GaAs Schottky-diode-based mixers, an effective analysis method based on the proposed simplified formulas combined with full-wave simulation is given in this letter. The complex nonlinear analysis is simplified, and the dimension of key circuit has been estimated based on simplified formulas. A 3-D electromagnetic simulation software has been used for accurate circuit dimension from the perspective of signal transmission notches. This optimization method simplifies the calculation process and saves the design time. To verify the above-mentioned technique, an E-band broadband fundamental mixer and a W-band broadband sub-harmonic mixer are fabricated and measured. The mixers have broadband characteristics and the measured results are in good agreement with the simulation results. The proposed method can be used to intuitively and quickly remove intermediate frequency (IF) output power nulls in broadband mixers’ working frequency band.

2 citations

Journal ArticleDOI
01 May 2023-Sensors
TL;DR: In this article , a Yagi-Uda antenna with stable gain by near-zero-index metamaterial (NZIM) has been proposed for vehicular 5G communication, which consists of magneto-electric dipole structure and coaxial feed patch antenna.
Abstract: In this paper, a stereoscopic ultra-wideband (UWB) Yagi–Uda (SUY) antenna with stable gain by near-zero-index metamaterial (NZIM) has been proposed for vehicular 5G communication. The proposed antenna consists of magneto-electric (ME) dipole structure and coaxial feed patch antenna. The combination of patch antenna and ME structure allows the proposed antenna can work as a Yagi–Uda antenna, which enhances its gain and bandwidth. NZIM removes a pair of C-notches on the surface of the ME structure to make it absorb energy, which results in two radiation nulls on both sides of the gain passband. At the same time, the bandwidth can be enhanced effectively. In order to further improve the stable gain, impedance matching is achieved by removing the patch diagonally; thus, it is able to tune the antenna gain of the suppression boundary and open the possibility to reach the most important characteristic: a very stable gain in a wide frequency range. The SUY antenna is fabricated and measured, which has a measured −10 dBi impedance bandwidth of approximately 40% (3.5–5.5 GHz). Within it, the peak gain of the antenna reaches 8.5 dBi, and the flat in-band gain has a ripple lower than 0.5 dBi.
DOI
TL;DR: In this article , a novel aperture-shared dual-polarized omnidirectional antenna for 5G application is proposed, where the vertically polarization and horizontal polarization share a physical region and a power divider with a Z-shaped feeding networks.
Abstract: In this letter, a novel aperture-shared dual-polarized omnidirectional antenna for 5G application is proposed. To realize the compact and broadband characteristics, the vertically polarization (VP) and horizontal polarization (HP) share a physical region and a Wilkinson power divider with a Z-shaped feeding networks is utilized. Two antenna prototypes are fabricated and measured, with the dimensions are 0.70λ0 × 0.70λ0 × 0.07λ0 and 0.62λ0× 0.62λ0 × 0.09λ0 for the 3.5 and 5.8 GHz antennas, respectively. The port isolation of the 3.5 GHz antenna is better than 35 dB, with radiation efficiency higher than 85.4%. The measured −10 dB impedance bandwidths of the 5.8 GHz antenna are better than 23.8%. The proposed antennas are suitable for 5G application for their low-profile, compact, broadband, and dual polarization characteristics.
Proceedings ArticleDOI
13 Jul 2023
TL;DR: In this article , the authors proposed an MIMO antenna for vehicle-to-everything (V2X) communication, which adopts two ways of combline filters and absorption wall decoupling.
Abstract: This paper presents an MIMO antenna for vehicle-to-everything (V2X) communication, which adopts two ways of combline filters and absorption wall decoupling. A combline filter and an absorption wall are used, respectively, for internal and external decoupling. The combline filter is incorporated between the ground of the two adjacent antennas, which reduces the mutual coupling between them. Additionally, the mutual coupling of radiation between adjacent antennas is significantly reduced by the absorber wall. These combline filters and absorber walls use the method of electromagnetic field distribution to explain the reduction in the mutual coupling between the adjacent antennas. The transmission coefficient and surface current distribution explain the effectiveness of the decoupling structure. When the frequency is between 3.8 and 4.8 GHz, the simulation and measurement results show that S11 is less than −10 dB, the bandwidth is 25% and the peak gain is 7.8 dBi. In addition, the proposed MIMO antenna has a high isolation between antenna units (>37 dB), and the envelop correlation coefficient (ECC) is less than 0.005.
Journal ArticleDOI
30 May 2023-Sensors
TL;DR: In this article , an absorbing material on a button antenna is proposed for pedestrian-to-vehicle (P2V) communication, which provides safety service to road workers on the highway or in a road environment.
Abstract: Vehicular communication systems can be used to enhance the safety level of road users by exchanging safety/warning messages. In this paper, an absorbing material on a button antenna is proposed for pedestrian-to-vehicle (P2V) communication, which provides safety service to road workers on the highway or in a road environment. The button antenna is small in size and is easy to carry for carriers. This antenna is fabricated and tested in an anechoic chamber; it can achieve a maximum gain of 5.5 dBi and an absorption of 92% at 7.6 GHz. The maximum distance of measurement between the absorbing material of the button antenna and the test antenna is less than 150 m. The advantage of the button antenna is that the absorption surface is used in the radiation layer of the antenna so that the antenna can improve the radiation direction and gain. The absorption unit size is 15 × 15 × 5 mm3.

Cited by
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Proceedings ArticleDOI
12 Sep 2022
TL;DR: In this article , an E-band wideband receiver front-end with stable output power over large input dynamic range is presented, which adopts a double-conversion superheterodyne structure combined with automatic gain control (AGC) technology to realize the wideband signals reception and dynamic range compression.
Abstract: An E-band wideband receiver front-end with stable output power over large input dynamic range is presented in this paper. It adopts a double-conversion superheterodyne structure combined with automatic gain control (AGC) technology to realize the wideband signals reception and dynamic range compression. An E-band mixer is designed based on Schottky diodes which features advantages in broadband and low cost, compared with commercially available chips. The AGC loop in the intermediate frequency circuit utilizes 3 voltage variable attenuators to provide a 78 dB continuously variable gain and uses a logarithmic detector to form an analog feedback loop, which exhibits a stable and high-flatness output power over 73 dB input dynamic range. The measured input dynamic range of the receiver front-end is −55dBm to +5 dBm with output power fluctuation better than ±1 dB, in the operating frequency range of 66.5~75.5 GHz. The power flatness of the output frequency response within the 500 MHz channel bandwidth is better than ±0.5 dB. Besides, the harmonic suppression and spur suppression of the IF output signal is better than 52 dBc and 75 dBc, respectively.
DOI
12 Sep 2022
TL;DR: In this paper , an E-band wideband receiver front-end with stable output power over large input dynamic range is presented, which adopts a double-conversion superheterodyne structure combined with automatic gain control (AGC) technology to realize the wideband signals reception and dynamic range compression.
Abstract: An E-band wideband receiver front-end with stable output power over large input dynamic range is presented in this paper. It adopts a double-conversion superheterodyne structure combined with automatic gain control (AGC) technology to realize the wideband signals reception and dynamic range compression. An E-band mixer is designed based on Schottky diodes which features advantages in broadband and low cost, compared with commercially available chips. The AGC loop in the intermediate frequency circuit utilizes 3 voltage variable attenuators to provide a 78 dB continuously variable gain and uses a logarithmic detector to form an analog feedback loop, which exhibits a stable and high-flatness output power over 73 dB input dynamic range. The measured input dynamic range of the receiver front-end is −55dBm to +5 dBm with output power fluctuation better than ±1 dB, in the operating frequency range of 66.5~75.5 GHz. The power flatness of the output frequency response within the 500 MHz channel bandwidth is better than ±0.5 dB. Besides, the harmonic suppression and spur suppression of the IF output signal is better than 52 dBc and 75 dBc, respectively.