| 1. |
- Tao, Yonghui, et al.
(författare)
-
Design of Planar Directional Coupler using 2-Bit Fragment Structures
- 2021
-
Ingår i: Applied Computational Electromagnetics Society Journal. - 1054-4887. ; 36:12, s. 1610-1615
-
Tidskriftsartikel (refereegranskat)abstract
- Automatic design of planar directional coupler can be implemented by multi-objective optimization searching for the optimal planar fragment-type structure (FTS). The 2-bit FTS description scheme may include necessary fine structures in fragments to enhance the FTS design. By coding the coupler design space on PCB in 2-bit FTS, defining the FTS design matrix, and searching for the optimal structure, directional coupler can be designed without any structure presetting or artificial intervention. The scheme is demonstrated by designing 10-dB wideband directional coupler with 2-bit FTS scheme. The designed directional couplers are fabricated and tested to show maximum directivity of 58 dB with 36% operation bandwidth.
|
|
| 2. |
- Tao, Yonghui, et al.
(författare)
-
Monte carlo‐based indoor rfid positioning with dual‐antenna joint rectification
- 2021
-
Ingår i: Electronics. - : MDPI AG. - 2079-9292. ; 10:13
-
Tidskriftsartikel (refereegranskat)abstract
- A novel Monte Carlo‐based indoor radio‐frequency identification (RFID) positioning scheme is proposed for dual‐antenna RFID systems with the cooperation of dual‐antenna joint rec-tification. By deploying reference passive RFID tags on the ground to establish an RFID tag‐based map, indoor self‐positioning of a moving platform carrying an RFID reader with two forward‐look-ing antennas can be simply implemented by looking up the positions of responded RFID tags at each time step of movement, and estimating the platform position by using the proposed Monte Carlo‐based algorithm. To improve the positioning accuracy of Monte Carlo‐based positioning, each antenna channel, with its own footprint on the ground, may rectify its position estimation by using the tag position information interrogated by the other antenna channel. The algorithm for dual-antenna rectification is proposed. The performance of the proposed Monte Carlo‐based self‐posi-tioning scheme is demonstrated by both simulation and experiment tests. Some factors in a practical indoor‐positioning system, such as the reference tag distribution pattern, reader antenna footprint size, and footprint overlap, are discussed. Some guide rules for deploying the RFID indoor‐posi-tioning system are also reported.
|
|
| 3. |
- Wang, Xinchen, et al.
(författare)
-
Design of High-Data-Density Chipless RFID Tag Embedded in QR Code
- 2022
-
Ingår i: IEEE Transactions on Antennas and Propagation. - 0018-926X .- 1558-2221. ; 70:3, s. 2189-2198
-
Tidskriftsartikel (refereegranskat)abstract
- A design scheme for embedding a chipless radio frequency identification (RFID) tag in a quick response (QR) code is proposed and demonstrated. By searching for QR modules that can be metalized to form a loop resonator in the edge area and to load the loop in the central area, the chipless RFID tag with an optimized loaded-loop resonator can be designed in the QR code. A specific loop genetic operator is proposed for optimization searching. The optimized loaded-loop resonator has a sharp dominant resonant peak at frequency as low as possible and a harmonic resonant peak at frequency as high as possible, which provides large space for data encoding of chipless RFID. By removing or demetalizing the metalized loading modules, the resonant frequency can be tuned conveniently for frequency shift keying (FSK) coding. For demonstration, the chipless RFID tag embedded in the QR code is designed and tested. It is shown that the RFID tag allows at least nine distinct resonant frequencies for simple FSK coding, which indicates a coding capacity of 3.17 bits and a normalization coding density of approximately 501.78 bits/ $\lambda _{\mathrm {g}}^{2}$ /GHz for the chipless RFID tag embedded in the QR code.
|
|
