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15th International Conference on Microwave and Millimeter Wave Technology, ICMMT 2023

作者： Zhang, Yudong Li, Zheng Wang, Junhong Tian, Guansuo Li, Dawei Zhang, Tao Beijing Jiaotong University Key Laboratory of All Optical Network and Advanced Telecommunication Network Ministry of Education Institute of Lightwave Technology Beijing100044 China China Academy of Launch Vehicle Technology China

ISBN: (纸本)9798350338874

In this paper, a 1-bit uniform one-dimension (1-D) antenna array used for calculating radiation pattern of antenna is discussed. For this kind of antenna array, the amplitude of elements can only be set as 0 or 1. The method based on adjusting amplitude of elements for changing radiation angle is put forward. To generate uniform field distribution, the condition of beam switching is introduced and a new beam-scanning scheme which controls the gain of different beams by adjusting the number of used elements is discussed. A simulated example is used and calculated to verify the new beam-scanning scheme. The normalized radiation pattern, the normalized received power and the states of elements are shown. In this example, 20 beams which have different radiation angle and gain are used to generate a merged received power based on the principle of beam switching. From the calculated results, the last merged received power becomes uniform, which verifies the new beam-scanning scheme. © 2023 IEEE.

关键词： Antenna arrays

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Design of a Triple-layer SIW Antenna with Multidirectional Beam for 5G Applications

Design of a Triple-layer SIW Antenna with Multidirectional B...

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2022 IEEE Region 10 International Conference, TENCON 2022

作者： Fu, Xiaona Zhang, Zhan Beijing Jiaotong University Key Laboratory of All Optical Network and Advanced Telecommunication Network Institute of Lightwave Technology Beijing100044 China

ISBN: (数字)9781665450959

ISBN: (纸本)9781665450959

In this paper, a triple-layer SIW-fed linearly polarized antenna with endfire and pm broadside radiations is proposed for 5G Millimeter-Wave Applications. The pattern changes by switching different ports. When port 1 or port 3 is excited, the slots on the top and bottom layers work as the radiators to provide broadside patterns. When port 2 is excited, a horizontal magnetic current at the open aperture can be generated which is complementary to the electric dipole made up of the metal vias around, thereby obtaining an endfire beam. The proposed antenna has a compact size and shows good radiation performance. © 2022 IEEE.

关键词： Millimeter waves

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A Distributed Reception Based Method for Identifying Vortex Beams

SSRN

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SSRN 2024年

作者： Su, Yongfu Jiang, Youchao Zhao, Yuzhen Wang, Zixiao Xiao, Shiying Key Laboratory of All Optical Network and Advanced Telecommunication Network of EMC Institute of Lightwave Technology China Beijing Jiaotong University Beijing100044 China

After the vortex beam is transmitted in the space laser communication scene for hundreds of kilometers, the spot diameter will expand to several meters or even tens of meters, and the existing detection methods that require receiving the whole spot are no longer applicable. In order to address this problem, a distributed detection scheme is proposed in this paper for demultiplexing two L-G beams. We choose two specific points on the light spot to receive two optical signals. Then the two optical signals are interfered with a designed optical fiber path which use the cross-coupling of the coupler. Then the demultiplexing is achieved according to the interference results at two ports. The feasibility of this scheme is theoretically analyzed, and the demultiplexing of L-G beams with multiple combinations of topological charge numbers is realized. © 2024, The Authors. all rights reserved.

关键词： Demultiplexing

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A Dual-Band Magneto-Electric Monopole Antenna Fed by a Self-Reconfigurable Waveguide

A Dual-Band Magneto-Electric Monopole Antenna Fed by a Self-...

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2022 IEEE Region 10 International Conference, TENCON 2022

作者： Wang, Lan Li, Yujian Wang, Junhong The Institute of Lightwave Technology Key Laboratory of All Optical Network Advanced Telecommunication Network of Ministry of Education Beijing Jiaotong University Beijing China

ISBN: (数字)9781665450959

ISBN: (纸本)9781665450959

A dual-band magneto-electric (ME) monopole fed by a self-reconfigurable waveguide is proposed. By loading periodic structures with a stopband, the waveguide owns two operating bands supporting the single quasi TE10 mode. The antenna is developed based on the combination of an open-ended self-reconfigurable waveguide and electric monopoles that separately operate in microwave and millimeter-wave bands. Stable radiation characteristics are achieved within the low-frequency band from 10.6 to 11.7 GHz and the high-frequency band from 30.9 to 41 GHz, respectively. © 2022 IEEE.

关键词： Monopole antennas

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A Compact Reconfigurable Filtering Antenna for Wireless Applications 13

A Compact Reconfigurable Filtering Antenna for Wireless Appl...

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13th Asia-Pacific International Symposium on Electromagnetic Compatibility and Technical Exhibition, APemc 2022

作者： Li, Yihang Chen, Meie Institute of Lightwave Technology Beijing Jiaotong University The Key Laboratory of All Optical Network and Advanced Telecommunication Network Ministry of Education Beijing China

ISBN: (数字)9781665416719

ISBN: (纸本)9781665416719

A compact reconfigurable filtering antenna is presented in this paper. The proposed antenna consists of a fork-shaped radiation patch, a four-pole hairpin feeding network, a T-branch and two PIN diodes. The PIN diodes inside the feeding network can switch the operation frequency bands. By turning ON/OFF the diode D1 and D2, the antenna can work in 1.5-1.6GHz (L-band for satellite communication), 2-2.1GHz (n65 band for LTE) and 3.3-3.4GHz (indoor communication for 5G). The antenna can be used for multiple purposes. © 2022 IEEE.

关键词： Microwave antennas

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A Wideband Dual-Beam Patch Array Antenna With Compact Size and High Efficiency for Dual-Target Wireless Communications

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IEEE Antennas and Wireless Propagation Letters 2025年

作者： Zheng, Wei Wang, Junhong Beijing Jiaotong University Key Laboratory of All Optical Network and Advanced Telecommunication Network Ministry of Education Institute of Lightwave Technology Beijing100044 China

In this letter, a wideband dual-beam patch antenna and its array with compact size and high efficiency are proposed, analyzed, and measured. The antenna geometry and operational principle based on pattern multiplication theory are first introduced. A two-element dual-beam antenna is then designed, followed by the development of a 2×1 dual-beam antenna array to achieve higher gain and narrower beamwidth. Two prototypes are manufactured to validate the design concept. The measured results confirm that the peak gains of proposed element and its 2×1 antenna array are 6.1 dBi and 9.7 dBi, and their bandwidths are 43.7% and 55.9%, respectively. Besides, the total radiation efficiencies of both prototypes exceed 90%. The proposed antennas possess advantages of low cost, wideband and high efficiency, thereby provides a promising candidate for advanced dual-target wireless communication systems. © 2002-2011 IEEE.

关键词： Bandwidth

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3D-printed High-Gain Wideband Antenna Arrays for Millimeter-Wave Applications

3D-printed High-Gain Wideband Antenna Arrays for Millimeter-...

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2022 IEEE Region 10 International Conference, TENCON 2022

作者： Li, Yujian Sun, Fanqi Wang, Junhong The Institute of Lightwave Technology The Key Laboratory of All Optical Network and Advanced Telecommunication Network of Ministry of Education Beijing Jiaotong University Beijing China

ISBN: (数字)9781665450959

ISBN: (纸本)9781665450959

The millimeter-wave high-gain wideband antenna arrays with dual- and linearly-polarized radiation realized by the three-dimensional (3D) printing technology are summarized in this paper. The dual-polarized magneto-electric (ME) dipole and horn antennas serving as the radiating elements are fed by the air-filled full-corporate feed networks. A novel air-filled differential feeding cavity loaded with a shorted-ended cross-shaped waveguide are employed to widen the bandwidth for the array with dual-polarization. In view of the theoretical analysis based on the one-time-reflection circuit model, the X-junctions and multi-reflection-nulls T -junctions are respectively cascaded to form the X-type and H-type topology full-corporate feed networks in order to achieve bandwidth enhancement for the large-scale array. The measured results of the three arrays have confirmed that the 3D-printed arrays are attractive candidate for various millimeter-wave wireless applications. © 2022 IEEE.

关键词： Millimeter waves

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A 3D-Printed Simple Asymmetric Orthomode Transducer for Wideband THz Applications

A 3D-Printed Simple Asymmetric Orthomode Transducer for Wide...

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IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP)

作者： Junyao Tan Yujian Li Junhong Wang Key Laboratory of All Optical Network and Advanced Telecommunication Network of MOE Beijing Jiaotong University Beijing China

ISBN: (数字)9798350351019

ISBN: (纸本)9798350351026

A novel compact asymmetric wideband orthomode transducer (OMT) design method is presented in this paper. The design employs an asymmetric geometry which is based on a T-waveguide transmission line. To address the issue of higher-order mode reflections typical of asymmetric structures, a novel T-shaped waveguide-to-waveguide transducer structure has been proposed. This new structure is compatible with both fundamental and higher-order modes, expanding the bandwidth of the OMT. To verify the design, the OMT is connected to a pyramidal horn and fabricated by micro-3D printing with a weight of only 0.35 g. Measured results demonstrate that the proposed OMT achieves a wide bandwidth of 53.9% (from 126 GHz to 219 GHz) and an isolation between the two ports of more than $\mathbf{5 0} \mathbf{d B}$. Benefitted from the compact structure and excellent performance, the new method would be an attractive candidate in the new generation of terahertz wireless communication systems.

关键词： Printing Wireless communication Geometry Transducers Power transmission lines Transmission line measurements Reflection Feeds Wideband Terahertz communications

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Sidewall-Integrated Ultra-Wideband ME-Dipole Phased Array for Millimeter-Wave Applications

Sidewall-Integrated Ultra-Wideband ME-Dipole Phased Array fo...

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Antennas and Propagation & USNC/URSI National Radio Science Meeting

作者： Junyao Tan Yujian Li Junhong Wang Key Laboratory of All Optical Network and Advanced Telecommunication Network of MOE Beijing Jiaotong University Beijing China

ISBN: (数字)9798350369908

ISBN: (纸本)9798350369915

A sidewall-integrated ultra-wideband ME-dipole antenna array is presented. The antenna array radiation structure is composed of an open-ended substrate integrated waveguide (SIW) and a pair of electric dipoles which are successfully integrated into the PCB edge through a sidewall metallization process. A direct feeding mechanism based on SIW open-ended structure is developed. The integrated feeding approach offers a straightforward yet efficient method of realizing impedance matching over a wideband. The antenna demonstrates outstanding performance with a bandwidth of 94.7% and stable radiation characteristics. Furthermore, by eliminating the scanning blindness, wide scanning angles of ±65° at 30GHz, ±50° at 40 GHz, and ±40° at 50GHz can be achieved, respectively. The measured results exhibit a high degree of consistency with the simulated ones.

关键词： Phased arrays Dipole antennas Metallization Impedance matching Millimeter wave technology Millimeter wave measurements Millimeter wave propagation

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The performance research of ADMIN detection algorithm for MDL-impaired mode division multiplexing fiber transmission

The performance research of ADMIN detection algorithm for MD...

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2021 International Conference on optical Instruments and Technology: optical Communication and optical Signal Processing

作者： Fengju, Fan Jianyong, Zhang Institute of Lightwave Technology Beijing Jiaotong University Beijing100044 China Key Laboratory of All-Optical Network and Advanced Telecommunication Network of 7 EMC Beijing Jiaotong University Beijing100044 China

ISBN: (纸本)9781510655614

We investigate the performance and complexity of minimum mean square error (MMSE) and alternating direction method of multipliers based infinity-norm (ADMIN) for mode dependent loss (MDL) impaired mode division multiplexing (MDM) systems. Our result shows the performance of ADMIN is better than that of MMSE in medium and small MDL. In QPSK modulation mode, the computational complexity of ADMIN detection algorithm is lower than that of MMSE. In addition, we studied how to continue to improve the performance of the ADMIN detection algorithm. We found that the increase of the ß parameter will significantly improve the performance of ADMIN in the MDL communication system without increasing the computational complexity. When the ß parameter is increased by 20 times, the BER performance changes from 10-4 to 10-5, which is an order of magnitude improvement. © 2022 SPIE.

关键词： Mean square error

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