Zobrazeno 1 - 10
of 33
pro vyhledávání: '"Junming Diao"'
Autor:
Junming Diao, Lu Liu
Publikováno v:
IEEE Open Journal of Antennas and Propagation, Vol 4, Pp 1056-1064 (2023)
In classical antenna theory, the Thévenin equivalent circuit is a commonly used tool to analyze the characteristics of receiving antennas. However, when dealing with a lossy antenna that is near a large load impedance, this circuit has limitations i
Externí odkaz:
https://doaj.org/article/8556a6fd5d564099ab3492c986d0ba25
Autor:
Junming Diao
Publikováno v:
IEEE Open Journal of Antennas and Propagation, Vol 3, Pp 1264-1272 (2022)
Distributed phased arrays based on unmanned aerial vehicle (UAV) swarm with small antenna elements on each micro-UAV are expected to achieve much better performance than the traditional phased arrays due to a large amount of swarm mobile individuals
Externí odkaz:
https://doaj.org/article/fda4ac9f51cd44158a465d9ad1429dcd
Publikováno v:
IEEE Antennas and Propagation Magazine. :2-13
Publikováno v:
IGARSS 2022 - 2022 IEEE International Geoscience and Remote Sensing Symposium.
Autor:
Junming Diao, Lu Liu
Publikováno v:
2022 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting (AP-S/URSI).
Publikováno v:
IEEE Antennas and Wireless Propagation Letters. 19:143-147
Streamlines of the Poynting vector field connect antenna figures of merit with the energy flow characteristics near a receiving antenna. Poynting streamlines properties and absorption aperture of antenna under different load conditions have been stud
Publikováno v:
IEEE Transactions on Antennas and Propagation. 67:884-891
The flow of energy around array antenna in receiving mode can be modeled by generating streamlines of the Poynting vector field. From the streamlines that terminate on the array element loads, a geometrical shape can be assigned to the effective area
Autor:
Karl F. Warnick, Junming Diao
Publikováno v:
IEEE Transactions on Antennas and Propagation. 66:432-437
Fundamental limits on the degree of practical achievable superdirectivity for antennas include narrow bandwidth, large antenna loss, and sensitivity to excitation and fabrication errors. Superdirective antennas are commonly considered as transmitters
Publikováno v:
IEEE Transactions on Antennas and Propagation. 65:7083-7090
Array antennas with aperiodic element placement provide a way to mitigate grating lobe level when the array element spacing is larger than one half wavelength. Design techniques for aperiodic arrays include thinning, numerical optimization, and other
Autor:
Karl F. Warnick, Junming Diao
Publikováno v:
IEEE Transactions on Antennas and Propagation. 65:5871-5877
For phased arrays used in satellite communications and radio astronomy, high sensitivity is required, and minimizing antenna losses is critical. Losses for single antennas can be minimized using high conductivity materials. It is less well understood