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In this paper, we have proposed a triple-band antenna with H-shaped and U-shaped slots for PCS/WLAN/UWB applications. The antenna has a modified trapezoidal radiating patch, H-shaped and U-shaped slots, CPW feeding, and step for impedance matching. Parametric studies and radiation characteristics for the antenna are presented. The proposed antenna exhibits a voltage standing wave ratio (VSWR) of less...
This paper describes a field demonstration and presents the network performance of an 802.11 ground-UAV network composed of 11 ground stations, a mobile vehicle and two fixed wing UAVs, connected by two routing gateways to a legacy wired network. The network effects demonstrated include mobility, network partitions and merges, and gateway failovers. The paper presents experimental results for recorded...
So far we have developed Emergency Telemedicine System (ETS) which is a robust system using heterogeneous networks. In disaster areas, however, ETS cannot be used if the primary network channel is disabled due to damages on the network infrastructures. Thus we designed network management software for disaster communication network by combination of Mobile Ad hoc Network (MANET) and Wireless LAN (WLAN)...
A linear RF power amplifier with integrated reverse biased diode linearizer for IEEE 802.11b/g WLAN terminals is implemented with a 33 GHz-fT, 0.5-mum-SiGe bipolar technology. The proposed linearizer maintains the fixed base voltage of power stage HBTs. The power amplifier exhibits 24.5 dBm of 1-dB compression point (P1dB), with 36% of the power-added efficiency (PAE), and 17 dB of the power gain...
This paper set out to use a camera attached to a mobile terminal in order to inquire a car and track its location anywhere. The technology based in the research is to automatically recognize and verify license plates on the front and back of a car. The plates are input through a camera attached to a mobile terminal. The technology enables us to detect a car registration number and to transmit it along...
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