Average amplitude spectra are presented for large radiation impulses from the initial stage of 15 cloud-to-ground (CG) and 36 intracloud (IC) lightning discharges. The spectra are obtained by Fourier transformation of the time domain records of lightning radiation fields with wide bandwidth devices. The field records include the electric field change ∆E (bandwidth 0 –500 kHz), the electric fiel...

Q-enhanced LC filter technology offers an alternative to the use of direct conversion techniques for implementing fully integrated receivers. Design and performance issues for QE LC filters are discussed and a fully integrated 850-MHz, two-pole, bandpass filter with an 18-MHz 3-dB bandwidth is reported. The prototype design is implemented in a standard 0.8m CMOS process and achieves a rejection...

The aim of this paper is to discuss the development of LTE algorithm which has the most advantages compare to other technologies such as WiMAX and WiFi. In order to improve LTE disadvantages is to increase the bandwidth at both sides (transmitter and receiver), where the current bandwidth is 100 MHz and the peak data rate is 1Gpbs. The objective of this paper is to increase the bandwidth up to ...

For increased sensitivity in L-band radiometry, bandwidths on the order of 100 MHz are desirable. This will likely require active countermeasures to mitigate RFI. In this paper, we describe a new radiometer which coherently samples 100 MHz of spectrum and applies realtime RFI mitigation techniques using FPGAs. A field test of an interim version of this design in a radio astronomy observation co...

The purpose of this study was to ultrasonically characterize infarcted human myocardial tissue at the microscopic level by scanning acoustic microscopy. Infarcted myocardial specimens from ten cases with acute myocardial infarction were studied. Specimens were formalin fixed, paraffin embedded and sectioned to 10-micron thickness. A specially developed scanning acoustic microscope system, opera...

In the GPR frequency range, electromagnetic wave attenuation is largely controlled by dielectric relaxation processes. A primary relaxation commonly occurs in the 10 – 100 MHz range for many earth materials in which the GPR signal propagates effectively. This relaxation leads to strong nonlinearity in the frequency dependent attenuation and occurs in a frequency range that is often used for gro...

A low-voltage, low-power analog multiplier operating at 1.2 V is presented. The multiplier i,s composed of a pair of voltage-to-current converters and a pair of voltage followers. The current produced is then added in resistors to produce the voltage output. The circuit rnultiplies the incoming 900 MHz RF signal with an 800 MHz local oscillator signal to produce a 100 MHz IF output. The circuit...