A novel planar circular Apollonian fractal shaped UWB monopole antenna with band rejection capability is presented in this paper. The antenna performs satisfactorily in the frequency range 1.8–10.6GHz which gives a wide impedance bandwidth of 142% for VSWR within 2. The proposed antenna has the capability to reject the frequency band 5.125–5.825GHz assigned for IEEE802.11a and HIPERLAN/2. This ...

Direction of arrival estimation in coherent multipath environment by using the superresolution technique often requires decorrelation techniques. Spatial smoothing preprocessings are the most popular scheme as the techniques. In mobile environment, position change of the target/transmitter often brings us decorrelation effect. Multiple transmitting signals by an antenna array like a MIMO transm...

In this paper, a practical antenna selection (AS) scheme is investigated for downlink multiuser massive multiple input multiple output (MIMO) networks where a base station (BS) is equipped with many antennas (N) and communicates with K mobile stations (MSs) simultaneously. In the proposed antenna selection technique, S antennas (S ≤ N) are selected for transmission based on the knowledge of cha...

Today’s power systems are developing from traditional multi-sensor to ubiquitous Internet of Things systems. The environmental backscatter technology makes communication equipment get rid the dependence on supply, is more energy-efficient, and effectively extends distance, which very suitable for scenarios. Tag antenna an important part backscattering, but it has problems such as low reliabilit...

To improve the coverage and timing capability of enhanced Loran signals, three transmitters are planned to be built in Western China. The most appropriate antenna configuration can determined by comparing domestic foreign mainstream small radio antennas. By analyzing electrical structural parameters signal propagation curves transmitting antenna, it concluded that single tower umbrella provides...

Spatially selective modulation (SSM) is a physical layer security technique that uses multiple transmitting antennas and single receiving antenna. SSM allows only the legitimate receiver to receive desired modulated signal correctly because of location dependence multipath channel. Previous studies have been statistically conducted using Rayleigh fading Here, we evaluated secret transmission pe...

[1] Cross-beam wind is usually estimated using a full correlation analysis (FCA) method applied to signals from spaced antennas. In this paper we present a cross-correlation ratio (CCR) method for wind measurements. The CCR method is illustrated using theory, and data obtained with the National Center for Atmospheric Research’s multiple antenna profiling radar. The standard errors of estimated ...