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Characteristics of E-pHEMT vs. HBTs for PA Applications

Time Matters — How Power Meters Measure Fast Signals

Modern peak power meters can measure virtually all types of pulsed or repeating signals. To achieve this, these instruments are equipped with sophisticated trigger capabilities. Prerequisite to any fast measurement is the synchronization of the instrument’s measurement cycle to the actual event. Simply put, the input signal of interest has first to be “found.” Specific trigger settings prepare the instrument for this synchronization and, once the desired event occurs, provide stable signal representations, allowing detailed signal analysis and accurate measurements. To be able to “look ahead,” digital instruments often use special techniques such as circular acquisition buffers to facilitate display and measurement of pre-trigger events. Most RF peak power meters provide internal and external trigger capabilities. Internal triggering utilizes the envelope of the actual incoming RF signal, while external triggering utilizes a baseband trigger signal that is in some way synchronized with the RF input signal.
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What is Phase Noise?

Comparing Harmonic Load Pull Techniques With Regards to

Three harmonic load pull techniques are compared for optimizing power-added efficiency. A Fujitsu FLL351ME device is used at 1.9 GHz along with Focus iCCMT, iPHT and iMPT electromechanical tuners. As long as the tuning range limitations of the triplexer solution are disregarded, the three methods of harmonic tuning: Triplexer method, Harmonic Rejection Tuner (PHT) method, Multi-Purpose Multi-Frequency method, give nearly-identical results.
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Wireless Power Transmission with Circularly Polarized Rectenna

The rectenna is the voltage-doubler rectifier with the low-pass filter (LPF) for efficiency optimization and higher order harmonics re-radiation elimination. According to the measured results, the maximum RFto- DC conversion efficiency of the rectenna achieved 75% when the RF power of 15dBm is received with a load resistance of 2k at free space. The experimental results prove that the proposed rectenna is suitable for the WPT applications.
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Solutions for Wideband Radar and Satcom Measurements

A growing trend in Satellite communication (Satcom) and Radar systems in the aerospace and defense market is the need for increased signal and analysis bandwidth and processing gain. Satcom systems are being driven by demands for increased data rates, while modern Radar systems require more processing gain to improve range resolution, which in turn drives wider modulation bandwidths.
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Understanding Cable & Antenna Analysis

The cable and antenna system plays a crucial role of the overall performance of a Base Station system. Degradations and failures in the antenna system may cause poor voice quality or dropped calls. From a carrier standpoint, this could eventually result in loss of revenue.
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Wireless Location Signature Technology Overview

The Polaris Wireless Location Signatures (WLS) technology is an extremely cost-effective software based solution to the high-accuracy location determination problem, because no changes in the wireless device or in the wireless service provider’s base stations are required.
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The Cost and Performance Benefits of 80 GHz Links Compared to Short-Haul 18-38 GHz Licensed Frequency Band Products

GHz wireless links deliver multi-gigabit data rates over multi-kilometer distances, with the interference protection of licensed band operation. The key benefits provided by these systems include: highest available throughput; simple, all-outdoor design; lowest spectrum licensing costs and lowest dollar-per-megabit total cost of ownership.
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What's the Best Wireless Transport Option of Uncompressed HDTV Video?

A dual channel SMPTE292M wireless transport system is used as a characteristic example of a commercial MMW application. This system demonstrates the capacity benefits of MMW techniques by providing roughly 3Gbps of raw HDTV production video throughput in an unlicensed band.
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