| 1. |
- Liu, Peiye, 1985, et al.
(author)
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Hollow Waveguide 32 x 32-Slot Array Antenna Covering 71-86 GHz Band by the Technology of a Polyetherimide Fabrication
- 2018
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In: IEEE Antennas and Wireless Propagation Letters. - 1548-5757 .- 1536-1225. ; 17:9, s. 1635-1638
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Journal article (peer-reviewed)abstract
- This letter presents the design and the fabrication of a 32 x 32-element high-gain corporate-fed slot array antenna in the E-band. First of all, a 2 x 2 cavity-backed slots subarray is designed. Second, the subarray is extended to the whole array antenna by T-junction power dividers. In addition, a vertical transition from WR-12 to distribution network is also designed in order to excite the array antenna. For massive production in industry, the proposed antenna is manufactured in reality by utilizing chemical-plated polyetherimide. Then, the fabricated parts have been adjoined together by two thin layers of isotropic conductive adhesive. Finally, the fabricated antenna shows an impedance bandwidth of 20% with input reflection coefficient better than -12 dB and the aperture efficiency mostly larger than 60% with about 37 dBi realized gain between 71 and 86 GHz.
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| 2. |
- Ding, Xuhui, et al.
(author)
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A 16 × 16-Element Slot Array Fed by Double-Layered Gap Waveguide Distribution Network at 160 GHz
- 2020
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In: IEEE Access. - 2169-3536 .- 2169-3536. ; 8, s. 55372-55382
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Journal article (peer-reviewed)abstract
- In this article, a slot array with double-layered full-corporate-fed distribution network by ridge gap waveguide (RGW) in the G-band is presented. The array antenna proposed in this article contains $16\times 16$ -element radiation slots fed by air-filled ridge gap waveguide distribution network that achieves high-efficiency. Gap waveguide technology avoids the demand for perfect electrical contact in millimeter waves, therefore the expensive diffusion bonding and the laser welding processes are not demanded. Moreover, the high-accurate Computerized Numerical Control (CNC) machining is applied for the fabrication. Due to the limited layout space for the distribution network, two types of universal stepped cavity power dividers are presented in this article. The proposed array antenna is fed by a standard WR-5 waveguide at the bottom. Furthermore, the tested outcomes show that the proposed $16\times 16$ -element array has a gain larger than 30 dBi with over 50% antenna efficiency in the frequency range of 155–171 GHz.
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| 3. |
- He, Zhongxia Simon, 1984, et al.
(author)
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Integrated-EBG Ridge Waveguide and Its Application to an E-Band Waveguide 32×32 Slot Array Antenna
- 2020
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In: IEEE Open Journal of Antennas and Propagation. - 2637-6431. ; 1, s. 456-463
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Journal article (peer-reviewed)abstract
- A methodology of designing an E-band waveguide 32×32 slot array antenna with high-efficiency and low-cost manufacturing characteristics is proposed in this article, which is based on an integrated electronic bandgap (EBG) ridge waveguide designed by integrating a cross rectangle-hollow EBG structures in the conventional ridge waveguide. The integrated EBG structure intercepts the leakage from the unconnected gap in between the two metallic plates of the waveguide, and then it decreases the manufacturing cost without using the diffusion bonding technology and multi-layer welding assembly process. The design guideline is discussed, and then the antenna is fabricated. The measured radiation characteristics are in good agreement with predicted ones, which confirms that the proposed cross rectangle-hollow EBG structures is an attractive candidate of high-performance millimeter wave antenna.
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| 4. |
- Jin, Cheng, et al.
(author)
-
Low-Cost mmWave Metallic Waveguide Based on Multilayer Integrated Vertical-EBG Structure and its Application to Slot Array Antenna Design
- 2022
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In: IEEE Transactions on Antennas and Propagation. - 0018-926X .- 1558-2221. ; 70:3, s. 2205-2213
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Journal article (peer-reviewed)abstract
- A novel methodology to create metallic waveguides with multilayer integrated vertical-electromagnetic bandgap (EBG) structure is proposed in this article, and the structure realizes low-cost millimeter-wave (mmWave) slot array antennas. A multilayer stack of easy-to-process thin metallic etching plates is introduced to design mmWave waveguide using compression fit instead of diffusion bonding and welding assembly process. The electromagnetic (EM) wave leakage from the gaps between the metallic plates is suppressed using the vertical-EBG structure and antiphasing feeding. The dispersion diagrams of the vertical-EBG unit cell are investigated to illustrate the suppression of leakage. Another leakage wave intercepting methodology is adopted by antiphase feeding to prevent leakage wave from the adjacent slot subarrays. Finally, two examples of 2 $\times $ 8 and 8 $\times $ 8 slot array antennas are presented to verify our design concept. The measured impedance bandwidths of the two antennas are 77.1-84.6 GHz (9.3%) and 78.6-84.9 GHz (7.7%). In addition, the 3 dB broadside gain bandwidths are 73.1-85.3 GHz (15.1%) and 76.8-84.4 GHz (9.4%). The results show the aperture efficiencies up to 56.4%.
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| 5. |
- Jin, Cheng, et al.
(author)
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Ultra-Wide-Angle Bandpass Frequency Selective Surface
- 2021
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In: IEEE Transactions on Antennas and Propagation. - 0018-926X .- 1558-2221. ; 69:9, s. 5673-5681
-
Journal article (peer-reviewed)abstract
- A novel theory is proposed in this paper to design a bandpass frequency selective surface (FSS) with a stable angular response. Based on this theory, the performance of the structure is closely related to its tangential and normal components of permittivity and permeability. Theoretical formulas are derived to realize a high-efficiency transmission response with angular independency. To validate our design concept, an ultra-wide-angle bandpass FSS with metallic strips and square patch printed on the dielectric substrate is designed, and it exhibits a characteristic impedance matching for nearly all incident angles from 0° to 80°. Moreover, varactor diodes are mounted at the center of the square patch, and the transmission window can be tuned by changing the capacitance of the varactors from 6.07 GHz to 6.61 GHz without affecting its ultra-wide-angle characteristic. Finally, a prototype of the tunable ultra-wide-angle bandpass FSS is fabricated and measured, and the experimental results are in satisfying agreement with the predicted ones.
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| 6. |
- Liu, Jinlin, 1983, et al.
(author)
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A High-Gain High-Efficiency Corporate-Fed Slot Array Antenna directly Fed by Ridge Gap Waveguide at 60-GHz
- 2017
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In: 2017 International Symposium on Antennas and Propagation (ISAP). - 9781538604656 ; 2017-January
-
Conference paper (peer-reviewed)abstract
- An 8×8 slot array with high-efficiency and corporate-fed single layer by ridge gap waveguide at 60-GHz is introduced in this paper. The manufactured antenna depicts more than 19.6% bandwidth with input reflection coefficient better than -10 dB and the aperture efficiency higher than 70% with around 26 dBi realized gain between 58 and 66 GHz.
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| 7. |
- Liu, Jinlin, 1983, et al.
(author)
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A Low Sidelobe Double-Layer Corporate-Feed Array Antenna by Inverted Micro strip Gap Waveguide at 28 GHz
- 2019
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In: 2019 INTERNATIONAL SYMPOSIUM ON ANTENNAS AND PROPAGATION (ISAP 2019). - 9787900914040
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Conference paper (peer-reviewed)abstract
- In this work, a novel low sidelobe array antenna is designed at 28 GHz. The proposed array antenna is fed by classic full-corporate double-layer distribution networks based on newly introduced inverted microstrip gap waveguide. In order to achieve low sidelobe property, a classic Taylor synthesis method is adopted in this work. In the distribution network, a couple of unequal power dividers with identical output phases are applied for the low sibelobe in this work. The fundamental radiator is 2 x 2 slot sub-array, and the entire array antenna is constructed by 8x8 of such kind sub-arrays. The simulated radiation patterns show that the first sidelobe levels, front-back ratio of both E-plane and II-plane from 26.5 GHz to 29.5 GHz are very well improved compared with traditional ones with the equal amplitude and phase distribution networks. The input impedance bandwidth is about 12% with the reflection coefficient below-10 dB, and the gain is more than 29 dBi from 26.5 GIlz to 29.5 GHz.
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| 8. |
- Liu, Jinlin, 1983, et al.
(author)
-
A Low Sidelobe Double-Layer Corporate-Feed Array Antenna by Inverted Microstrip Gap Waveguide at 28 GHz
- 2019
-
In: 2019 International Symposium on Antennas and Propagation, ISAP 2019 - Proceedings.
-
Conference paper (peer-reviewed)abstract
- In this work, a novel low sidelobe array antenna is designed at 28 GHz. The proposed array antenna is fed by classic full-corporate double-layer distribution networks based on newly introduced inverted microstrip gap waveguide. In order to achieve low sidelobe property, a classic Taylor synthesis method is adopted in this work. In the distribution network, a couple of unequal power dividers with identical output phases are applied for the low sibelobe in this work. The fundamental radiator is 2×2 slot sub-array, and the entire array antenna is constructed by 8×8 of such kind sub-arrays. The simulated radiation patterns show that the first sidelobe levels, front-back ratio of both E-plane and H-plane from 26.5 GHz to 29.5 GHz are very well improved compared with traditional ones with the equal amplitude and phase distribution networks. The input impedance bandwidth is about 12% with the reflection coefficient below -10 dB, and the gain is more than 29 dBi from 26.5 GHz to 29.5 GHz.
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| 9. |
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| 10. |
- Liu, Jinlin, 1983, et al.
(author)
-
Analytical Solutions to Characteristic Impedance and Losses of Inverted Microstrip Gap Waveguide Based on Variational Method
- 2018
-
In: IEEE Transactions on Antennas and Propagation. - 0018-926X .- 1558-2221. ; 66:12, s. 7049-7057
-
Journal article (peer-reviewed)abstract
- This paper initially introduces analytical solutions to newly invented inverted microstrip gap waveguide (IMGW). By applying the classical variational method the characteristic impedance, dielectric loss, and conductor loss of the IMGW are obtained. The calculated characteristic impedance and losses of IMGWs with the present analytical method have been verified by commercial software CST. Furthermore, we have theoretically proved that the total loss of electromagnetic energy in the IMGW is much lower than that of covered microstrip line in millimeter waves (mmWs). Thereby, the IMGW has big advantages over covered microstrip lines for high-gain, high-efficiency array antennas in mmWs.
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