Zobrazeno 1 - 10
of 295
pro vyhledávání: '"Yongxi Qian"'
Publikováno v:
IEEE Transactions on Vehicular Technology. 52:1181-1188
A wireless sensor server is developed based on a reconfigurable active smart-antenna/retrodirective array. The system can serve as both a retrodirective array transponder and a smart-antenna receiver simply by changing the frequency of the local osci
Publikováno v:
IEEE Transactions on Antennas and Propagation. 51:756-765
We present the analysis and design of a microstrip antenna array with a conical beam. The antenna array employs a periodic structure derived from a microstrip on a perforated ground plane. The microstrip antenna array consists of eight leaky lines ev
Publikováno v:
IEEE Transactions on Microwave Theory and Techniques. 51:653-659
A high-efficiency and compact AlGaN/GaN heterojunction field-effect transistor (HFET) power amplifier integrated with a microstrip antenna at 7.25 GHz is presented for RF front-end circuit applications. A microstrip circular sector antenna is employe
Publikováno v:
IEEE Transactions on Microwave Theory and Techniques. 50:1877-1884
A novel reconfigurable leaky-wave/patch microstrip aperture is introduced and characterized. The structure consists of a long leaky-wave microstrip antenna that has been segmented into several smaller patch antennas. The multimode structure can be re
Publikováno v:
IEEE Transactions on Antennas and Propagation. 50:600-606
A novel design of smart antenna system with adaptive beamforming capability is introduced for broad-band wireless communication. To achieve high data throughput of the multi-antenna system, a parallel analog-digital (A/D) signal processing scheme is
Publikováno v:
IEEE Transactions on Microwave Theory and Techniques. 49:1155-1161
This paper presents a C-band push-pull power amplifier integrated with a modified uniplanar quasi-Yagi antenna. In this circuit, corrugation is added to the truncated ground plane of the antenna so that it can be used for both out-of-phase power comb
Publikováno v:
Proceedings of the IEEE. 89:456-466
Recent studies showed that conventional approaches being used to solve problems imposed by hard-wired metal interconnects will eventually encounter fundamental limits and may impede the advance of future ultralarge-scale integrated circuits (ULSls).
Publikováno v:
IEEE Transactions on Microwave Theory and Techniques. 49:442-450
A balanced integrated-antenna self-oscillating mixer at 60 GHz is presented in this paper. The modal radiation characteristics of a dual-feed planar quasi-Yagi antenna are used to achieve RF-local oscillator (RF-LO) isolation between closely spaced f
Publikováno v:
IEEE Transactions on Microwave Theory and Techniques. 49:86-93
A new defected ground structure (DGS) for the microstrip line is proposed in this paper. The proposed DGS unit structure can provide the bandgap characteristic in some frequency bands with only one or more unit lattices. The equivalent circuit for th
Publikováno v:
IEEE Transactions on Microwave Theory and Techniques. 49:2336-2341
Several novel periodic structures for coplanar waveguides are presented. The proposed structures exhibit low insertion loss in the passband, simple fabrication, and slow-wave characteristics. These structures are applied to realize miniature low-pass