We report the generation and coherent detection of freely propagating ultrashort baseband electromagnetic pulses. Using optical rectification in ?110? GaAs for wideband emission and electro-optic sampling in a poled polymer for wideband detection, we demonstrate spectral sensitivity that extends from the far infrared (lambda~100 mum) to ~33 THz(lambda = 9 mum) . Over a band of nearly 20 THz, a ...

A novel coplanar waveguide (CPW) fed wide tapered slot antenna (WTSA) is presented in this paper. A wideband CPW-towide slotline (WSL) transition is employed to feed the antenna. The corrugated edge structure and broken line tapered profile are also applied in this design to achieve wideband performance, as well as maintain compact size. A prototype of the antenna is fabricated. The measured re...

In this paper, energy detectors are developed for wideband and ultra-wideband (UWB) pulse position modulation (PPM). Exact bit error probability (BEP) expressions are presented under different assumptions about the channel. More specifically, we present an expression for the instantaneous BEP for a specific channel realization as well as an expression for the average BEP for an i.i.d. zero-mean...

Using numerical and experimental techniques, a wideband, low-Q, electrically small antenna design is characterized as a function of frequency and the relati e phasing between antenna elements. The antenna demonstrates wideband operation, with a radiation Q approximately a factor of 20 below the Q-limit established by Chu for electrically small, omnidirectional antennas. 2000 John Wiley & Sons, ...

A novel miniature wideband rectangular patch antenna is designed for wireless local area network (WLANs) applications and operating for 5-6 GHz ISM band, and wideband applications. The proposed antenna gives a bandwidth of 4.84 to 6.56 GHz for S11<-10dB. The antenna has the dimensions of 20 mm by 15 mm by 0.8 mm on FR4 substrate. Rectangular slot and step have been used for bandwidth improvement.

This paper presents the design of a wideband 16 4 element array of a microstrip-proximity-fed rectangular-slot antenna for marine radar systems operating in the X-band. A wideband corporatefeed network is designed to feed the proposed array. The new design has a small size, a wide bandwidth of 52%, and good radiation characteristics in the entire operating band. © 2005 Wiley Periodicals, Inc. M...

High resolution eigenstructure-based techniques for signal source localization are known to be ineffective when the source covariance matrix is not of full rank. We present here two techniques to circumvent this problem in the context of wideband active source localization. An extension is made to show how eigenstructure methods can be applied even when there is only one snapshot available to e...

After a very short introduction to the history and theory of ultra wideband technology, we describe the current state-of-the-art (within the United States) in this emerging field by way of examples of recently fielded UWB hardware and equipment. Multispectral Solutions, Inc. (MSSI) is a pioneer and an established industry leader in the development of ultra wideband systems and has been actively...

This chapter covers key technologies in wideband audio coding including auditory masking, perceptual coding, frequency domain coding, and dynamic bit allocation. The MPEG standardization work is then described. MPEG algorithms have found a wide range of communications-based and storage-based applications. For example, European digital audio broadcast (DAB) makes use of MPEG-1. It will then be s...

Various wideband antennas have been interesting subjects in antenna designs and have found important applications in military and civilian systems. For examples, the super-wideband (SWB) antenna is a key component of electronic counterwork equipment in the information warfare; while the ultra-wideband (UWB) antenna is widely used in impulse radar and communication systems. With the development ...