The spread in transmitting frequency is used to enable the simultaneous recording of up to 12 animals. For each animal one needs a separate receiver. Transmitting frequency is about 300 MHz. All experiments were done indoors. Crossed yagi antennae (Winkler Spezialantennen, Kreuzdipol 300, directional antenna tuned at 300 MHz) were connected to AOR 8600 receivers (AOR, Ltd., Japan) that were mod...

The rapid development of various kinds of aerospace application systems requires the appropriate high-accuracy time and frequency standard. In order to establish suitable time and frequency standard in aerospace, based on the establishment of aerospace satellite visual model, we simulate the satellite visual time of 3-layer satellite constellation, including GEO satellite(Geostationary Earth Or...

In this work, the propagation loss of three short range directive channels at 5.5GHz is measured using different directive antennas and a Vector Network Analyzer (VNA). Results are given for a channel bandwidth of 300 MHz which will be the future channel bandwidth of IEEE 802.11 ac system. It has been noted that the multipath induced fading tends to have Normal Distribution at low distance betw...

In the field of Intelligent Transport Systems (ITS), inter-vehicle communication systems are actively researched for the purpose of decreasing the number of traffic accidents. In particular, reduced visibility due to buildings and vehicles is a significant cause of right-turn accidents and head-on accidents. The Inter-Vehicle Communication system enables the position of a vehicle to be transmit...

Advanced satellite communications system needs large-scale satellite-borne antenna with a function of beam steering and/or multiple spot beams to cover wide service area with high antenna gain. Although phased array antenna is very useful for the feed for the large reflector to satisfy the requirements above, it generally causes increase in the equipment weight, feed loss, and complexity in bea...

Wireless network widely used today include, cellular network, wireless mesh network (WMNs), wireless local area network and personal area network. The increasing demand for these networks has turned spectrum into a precious resource. For this reason, there is always a need for methods to pack more bits/Hz. A particular solution is to use multiple antenna at both transmitter and receiver side. S...

Wise arrangement of antennas is critical in wireless cellular systems for both reduction of co-channel interference (CCI) and increase the quality of service (QoS). In this paper, a novel architecture for antenna arrangement in CDMA wireless cellular systems is presented. In this architecture that we called microzone, every cell is divided into three (or more) zones and information transmission...

During the past few years, research covering propagation, channel characterization, and wireless system performance has yield a substantial knowledge of the 60 GHz channel. The unlicensed 60 GHz frequency band presents many attractive properties for wireless communications. This paper addresses some wideband propagation characteristics for broadband wireless LANs (BWLANs). Important system-desi...

Ultrafast photoresponse of dc-biased optically-thick YBa2Cu3O7−δ microbridges at T < Tc triggered with 100 fs optical pulses of high fluence was investigated by means of sampling oscilloscope and approach of a S-(1.5– 4 GHz) & C-(4–7 GHz) frequency-band antenna radiation, excited by the photoresponse. A superposition of ultrafast(photokinetic) and slow(bolometric) components of the photorespons...

Channel capacity of indoor Multi-input Multioutput Space Division Multiplexing (MIMO-SDM) with antenna selection diversity is analyzed using the ray tracing method. A large number of receiving antennas are divided into several blocks. Each block is corresponding to a receiving MIMO channel, and the number of transmitting channel is assumed to be equal to the number of receiving channel. The num...