MIMO (Multiple-input multiple-output) is an antenna technology for wireless communications in which multiple antennas are used at both the transmitter and the receiver. The antennas used at each end of the communications circuit are combined to optimize data speed within the limited radio frequency spectrum. The performance analysis of MIMO system over AWGN and Rayleigh fading channels using OS...

Multi-beam antenna is drawing attention due to its power-saving and interference-reducing. A topology control algorithm K-DRNG based on multi-beam antenna in heterogeneous wireless Ad Hoc network is proposed. The algorithm is mainly composed of three phases. In the stage of information collection, each node collects information of neighborhood by adjusting the transmitting power and controlling...

The design and optimization of an annular ring dielectric resonator antenna (DRA) operating in the C frequency band is addressed. The DRA is intended to be used as the radiating element of a transmitting array of active integrated antennas, its input impedance must exhibit a proper resistive load at the fundamental resonance frequency, as well as a dominant reactive behavior, either inductive o...

The derivation of a formula for accurate estimation of the total radiated power from a transmitting antenna for which the radiated power density is known in a finite number of points on the far-field sphere is presented. The main application of the formula is determination of directivity from power-pattern measurements. The derivation is based on the theory of spherical wave expansion of electr...

Heating, ventilation, and air conditioning (HVAC) ducts in buildings are typically hollow metal pipes which can be used as waveguides to carry signals and provide the network access to offices. Knowledge of channel properties is crucial to designing such a communication system. This paper presents a propagation model for a straight HVAC duct terminated at both ends. At high frequencies this duc...

Bistatic radar systems will play a great role in the coming decade since a large number of radar missions are being foreseen. Using existing transmitters, formations of small passive receivers will enhance our capability to gather backscatter information from earth. A bistatic SAR system operates with separated transmitting and receiving antenna and both can follow independent trajectories. If ...

Abstract We designed and fabricated a microwave transmitting antenna that uses an HTS thick disk as patch with resonant frequency of around 5.0 GHz. The reflection property S 11 , electromagnetic fields, current distributions, far-field several modes in the were analyzed using CST studio suite. compared properties resonance selected TM11 mode, which has smallest resonator size highest directivi...

Co-located MIMO is used to enlarge the antenna aperture virtually and increase angular resolution. This paper shows FMCW radar using VAA. Polyphase codes are designed for modulating successive chirps of transmitting signals. The optimized have low cross-correlations regardless Doppler filter mismatch. Compared with orthogonal codes, show robust performance mismatch lower angle estimation errors...

The recent exponential growth of high-speed Internet connections has created a huge demand for ubiquitous access links to the Internet, and mobile Internet services on cellular or wireless LAN networks have increased rapidly. A major role of mobile satellite communication networks is to provide ubiquitous broadband services. The target users of these services are people who do not have access t...