In this paper, a wideband circularly polarized (CP) filtering hybrid antenna is presented. The liquid dielectric resonator (DR) excited by microstrip-coupled cross-slot to generate CP radiation. Four inverted L-shaped strips are loaded on the ground plane introduce an additional resonant point, then two adjacent axial ratio (AR) minima combined improve bandwidth of single-feed antenna. By etchi...

In this paper we present an ultra low-voltage (ULV) floating-gate (FG) transconductance amplifier The amplifier is can operate at supply voltages down to 0.3V in a standard digital double poly CMOS process . The amplifier consists of three subcircuits, the single input analog FG inverter, the additive (double input) analog FG inverter with tunable gain and a FG digital inverter. Preliminary mea...

S. Weiss, T. Uelzen, G. Pantel, J. Mueller Philips Research Laboratories, Hamburg, Germany, Department of Micro Systems Technology, Hamburg University of Technology, Hamburg, Germany, MRI Devices Daum GmbH, Schwerin, Germany Objective: The motivation for the application of intravascular imaging coils is to gain high SNR images from a local area. To maximize SNR, proper tuning and matching of su...

Exponential growth and superradiance regimes in a high-gain free electron laser (FEL) are studied in this paper for both a seeded FEL and a Self-Amplified Spontaneous Emission (SASE) FEL. The results are compared to the earlier superrdaince theory and the recent experimental observation. The influence of an initial energy chirp along the electron bunch on the superradiance mode is explored for ...

We describe a quantum well intermixing process for the monolithic integration of various devices, each with a unique band edge. The process involves a single ion implant followed by multiple etch and anneal cycles. We have applied this method to design and fabricate widely-tunable sampledgrating DBR lasers with integrated electroabsorption modulators. The devices employ three unique band edges,...

An optimum SBS gain profile is designed to achieve better slow-light performance. It consists of a nearly flat-top profile with sharp edges. Tunable delays up to 3 pulse widths for 100-ps-long input pulses, corresponding to 10 Gb/s data rates, are found while keeping an output-input pulse-width ratio below 1.8. Bit-error-rate (BER) measurements performed for a non-return-to-zero modulation form...

We theoretically and experimentally compare the performance of two fully tunable phase shifter structures based on semiconductor optical amplifiers (SOA) by means of several figures of merit common to microwave photonic systems. A single SOA stage followed by a tailored notch filter is compared with a cascaded implementation comprising three SOA-based phase shifter stages. Attention is focused ...