Scalar-field dark matter models imply small oscillations of fundamental constants. These could result in observable variations the magnetic field a permanent magnet. We propose an experiment for detection this type through searches magnets with SQUID magnetometer or low-noise radiofrequency amplifier. show that may have comparable sensitivity to leading experiments searching constants range fre...

This paper describes a straightforward methodology for ultra low power design of a radiofrequency building block in CMOS technology. This design methodology is based on two parameters: First, the inversion coefficient of the transistor and the extracted equations from the radiofrequency circuits. Second, an optimum tradeoff between the performance key parameters such power consumption, gain, no...

A structurally supportive miniaturized low-weight (≤150 g) radiofrequency switch mode amplifier developed to power the small diameter Pocket Rocket electrothermal plasma micro-thruster called MiniPR is tested in vacuum conditions representative of space to demonstrate its suitability for use on nano-satellites such as “CubeSats.” Argon plasma characterization is carried out by measuring the opt...

Abstract In the framework of Compact Light XLS project [1], a Ka-band linearizer with electric field ranging from 100 to 150 MV/m is requested [2, 3, 4]. order feed this structure, proper high power klystron amplifier efficiency needed. This paper reports possible solution for operating on TM 010 mode at 36 GHz, third harmonic 12 GHz linac frequency, an 44% and 10.6 MW radiofrequency output pow...

We report the design and experimental measurement of a powered active magnetic metamaterial with tunable permeability. The unit cell is based on the combination of an embedded radiofrequency amplifier and a tunable phase shifter, which together control the response of the medium. The measurements show that a negative permeability metamaterial with zero loss or even gain can be achieved through ...

The low noise amplifier (LNA) serves as the first component of the radio frequency receiver system. The performance of LNA determines the sensitivity and selectivity of the receiver. In order to maximize performance the gain, noise figure and input matching of LNA needs to be optmized. This paper presents a 60GHz low noise amplifier on 0.13-μm standard CMOS technology designed using classical n...

A novel method for the excitation of ELF waves in the ionosphere is presented. It utilizes the nonlinear mixing of two groundor satellite-produced radio frequency waves with a compressional Alfv6n wave. Parametric amplification thresholds are estimated to be between 10 and 20 MW peak power for 5-MHz pumps producing waves in the ELF range. Potential applications to ELF communications are discussed.

This paper examines different linearization techniques which are used to linearize the power amplifier by emphasizing on weakness and strength of each technique. After complete analyze it has been concluded that Digital Pre Distortion (DPD) technique is the best linearization technique to linearize the power amplifier. DPD technique for linearizing a wideband radio frequency power amplifier has...

A linearized digital radio frequency (RF) power amplifier (PA), a switched RF PA, is more power efficient than an analog amplifier, but may cause interference in adjacent transmitting channels similar to analog amplifiers. This interference is due to the inherent nonlinearities, and this project investigated the possibility of reducing this interference by using a prefilter, a predistorter, to ...