In this paper it evaluates the BER (bit error rate) performance of MIMO system. MIMO uses multiple transmitting antennas, multiple receiving antennas and the space time block codes to provide diversity. MIMO transmits signal encoded by space time block encoder through different transmitting antennas. These signals arrive at the receiver at slightly different times. Spatially separated multiple ...

An optical dipole nano-antenna can be constructed by placing a sub-wavelength dielectric (e.g., air) gap between two metallic regions. For typical applications using light in the infrared region, the gap width is generally in the range between 50 and 100 nm. Owing to the close proximity of the electrodes, these antennas can generate very intense electric fields that can be used to excite nonlin...

Mode-selective surface-enhanced Raman spectroscopy (SERS) is demonstrated using plasmonic dipole antennas fabricated with electron beam lithography. An∼10× change of the relative enhancement between two different Raman modes is observed when the resonance frequency of the plasmonic antennas is tuned over the Raman modes by varying the geometrical parameters of the antennas, i.e., changing their...

The capacity of a flat-fading wireless channel increases with the number of antennas used at both ends of the wireless link. However, the complexity of Multiple Input Multiple Output (MIMO) transmission algorithms increases coincidently. Transmitting and receiving over a subset of the available antennas is referred to as antenna selection. A signal strength based selection criterion is introduc...

This paper derives a general analytical expression for the correlation coefficient of signals received by two identical spaced antennas in a radar system used to detect meteorological phenomena such as rain and clouds. Such a correlation coefficient is found as a function of the relevant physical parameters, namely distance between antennas (baseline distance), signal bandwidth, and antenna dir...

This paper presents results of experiments using a variety of antennas inside several buildings. Path loss models are presented for the 1.3 GHz and 4.0 GHz bands, and indicate little difference in indoor path loss throughout the low-microwave region. Results show that line-of-sight (LOS) channels offer significantly more cross-polarization discrimination than obstructed (OBS) channels. A profou...

1 WATERHOUSE. R.B : 'Small microstrip patch antenna', Electron. Lett., 1995, 31, pp. 604605 2 ROWLEY. J.T., and WATERHOUSE. R.B.: 'Performance of shorted microstrip patch antennas for mobile communications handsets at 1800MHz', IEEE Trans. Antennas Propug., (to appear) 3 WATERHOUSE, R.B., ROWLEY, J.T., and JOYNER. K.H.: 'Stacked shorted patch', Electron. Lett.. 1998, 34, pp. 612-614 4 TARGONSKI...

Over the last couple of years a number of spacetime block codes have been proposed for use in multiple transmit antennas systems. In this article we propose a method to extend any space-time code constructed for m transmit antennas to m p transmit antennas through GroupCoherent Codes (GCC). GCC make use of very limited feedback from the receiver (as low as one bit). In particular the scheme can...

1 Abstract—The paper discusses recent developments and challenges in the design of small omnidirectional circularly-polarized (CP) antennas. Although omnidirectional CP coverage is easily achievable using antenna arrays, it is just recently that small and low-cost antennas delivered this functionality. The paper addresses practical design problems for these antennas, not reported in previous pu...

Antennas radiate (vector) momentum as well as energy, but if the radiation pattern is symmetric, the total radiated momentum is zero. Consider a simple antenna array that consists of two short linear dipole antennas whose centers are λ/4 apart and whose conductors point along the line of centers of the antennas. If the two antennas are excited with a 90◦ phase difference, deduce the asymmetric ...