Weak signal detection and localization are basic and important problems in radar systems. Radar performance can be improved by increasing the receiver output signal-to-noise ratio (SNR). Localizing the received signal is an important task in the detection of signal in noise. Distorting the localization of the received signal can leads to incorrect target range measurements. In this paper an alg...

This article presents the response of RF microelectromechanical systems (RF MEMS), barium strontium titanate (BST), and gallium arsenide (GaAs)-based tunable filters and reconfigurable matching networks to a wideband code-division-multiple-access signal centered at 1.95 GHz. The RF MEMS tunable filter and impedance tuner result in very low intermodulation distortion and spectral regrowth compar...

Radiofrequency (RF) energy can be emitted into the skin, either non- or invasively, via a monopolar mode that utilizes an active electrode and a grounded electrode or via a bipolar mode that employs two active electrodes. In this experimental study of RF tissue reactions, bipolar RF energy was emitted in vivo to micropig skin at varying microneedle penetration depths, signal amplitudes, and con...

A high power oscillator circuit, designed to power radio-frequency ~rf! ion guides and traps, is described. The rf circuit is directly coupled to the guide/trap electrodes, and no frequency or impedance matching is required. The design provides precisely adjustable rf amplitudes from ;50 to 600 V, either under manual or computer control. The operating frequency can be varied from ,1 to ;30 MHz ...

Abstract The proposed Next Linear Collider (NLC) contains linac systems operating at L,S,C, and X band. This paper describes a wideband modular low-level RF (LLRF) system applicable for all NLC pulsed RF systems. High speed digital IF techniques are used for both arbitrary klystron drive modulation and accurate RF vector detection. Measurement of relative beam to RF phase, beam loading compensa...

Nowadays, it is easy to find radio transceivers having small size, low cost and still offering numerous functionalities. High-integration of radio-frequency (RF) circuits is still the main trend in the development of wireless devices. A down-converter is an essential part of any RF receiver. It basically performs the frequency translation between an incoming RF signal into a lower frequency to ...

We present the femtosecond synchronization between an 800-nm photocathode laser and an S-band RF oscillator using an optical-RF phase detection system at KAERI-WCI Accelerator. A 79.33-MHz commercial Ti:sapphire photocathode laser oscillator is locked to a 2.856-GHz RF master oscillator (RMO) using a fiberloop-based optical-microwave phase detector (FLOMPD), which results in 13 fs (rms) out-of-...

A printed dipole antenna integrated with a duplex RF switch used for mobile base station antenna beam steering is presented. A coplanar waveguide to coplanar strip transition was adopted to feed the printed dipole. A novel RF switch circuit, used to control the RF signal fed to the dipole antenna and placed directly before the dipole, was proposed. Simulated and measured data for the CWP-to-CPS...

Introduction The presence of an implantable active device (e.g. pacemaker or deep brain stimulator) usually represents a contraindication for an MR examination. Currently, effort is spent on the development of MR-conditional implantables. An important safety risk factor of all active implantable devices is potential RF coupling to conducting parts which may lead to RF heating. RF coupling is a ...