this article presents an overview of the recent Frequency dependent and Frequency independent antenna theory. An antenna is defined by Webster’s Dictionary as “a usually metallic device (as a rod or wire) for radiating (transmitting) or receiving radio waves or EM wave.” The IEEE Standard Definitions of Terms for Antennas (IEEE Std 145–1983) defines the antenna as “a means for radiating or rece...

1. Theoretical Background It is known that electromagnetic energy also associated with the propagation of the electromagnetic waves. We can use theoretically all electromagnetic waves for a wireless power transmission (WPT). The difference between the WPT and communication systems is only efficiency. The Maxwell's Equations indicate that the electromagnetic field and its power diffuse to all di...

In mobile communication, a less explored technique to mitigate fading effects is based on the physical parameter of the transmitter by varying the physical dimension of the transmitting antenna. This paper deals with a self adaptive system to eliminate severe fading effects in different multi antenna set-ups by adaptively updating the effective aperture of the transmitting antenna. The system c...

The effect of fading and interference effects can be combated with equalizer. This paper analyses the performance of MMSE equalizer based receiver for MIMO wireless channel .The BER characteristics for the various transmitting and receiving antenna is simulated in mat lab tool box and many advantages and disadvantages the system is described. The simulation carried out signal processing lab sho...

A UWB impulse array antenna (IAA) utilizing a novel electrical scanning system with tapped delay lines is proposed and its usefulness is experimentally verified. The experimental antenna is composed of impulse generators installed in each antenna element and tapped delay lines used for creating transmitting trigger signals, which is a simple circuit configuration. It is shown that the output ph...

In this paper the design of a mobile antenna system consisting of a transmitting and receiving sub-systems for Ku band geo-stationary satellite broadcasting and communication is mentioned. A transmitting sub-system plays the role of sending the signal toward the satellite while the receiving sub-system plays the role of receiving signal from the satellite and tracking the target satellite. The ...

The advances in wireless technology lead to the simultaneous growth in data speed with high accuracy in the field of communication. It is well known that, meeting the increased requirements of data rate in 4G technology is a complex task. So in order to meet these requirements a Multiple-Input-Multiple-Output (MIMO) system has been developed. Also MIMO-OSTBC system helps in improving accuracy a...

This paper presents a novel technique for analyzing the mode content excited by antennas placed in multimode waveguides. The technique is based on measuring the frequency response between the two antennas coupled into a waveguide and using that information to extract the mode content generated by the transmitting antenna. The technique is applicable to cases in which the mode amplitudes are app...

In this paper a novel data multiplexing scheme is presented. This technique uses an antenna array with K transmit antennas. In total K information bits are multiplexed in an orthogonal fashion. The special property of the multiplexing technique is that for each symbol duration only one out of K antennas is transmitting using BPSK modulation. Furthermore, the symbol duration is equivalent to the...

This is a revolutionary method which overcomes many of the antenna system analysis problems associated with UWB communication. By using this method, the antenna system is analyzed from the viewpoint of antenna to antenna transfer function, which makes it possible to consider the transmitting antenna and receiving antenna as a complete unit rather than individual element. The refined formulation...