New equations for circles of constant noise measure in the source reflection coefficient plane are presented, and these used to derive closed-form expressions minimum ( $M_{\text {min}}$ ) associated termination notation="LaTeX">$\Gam...

We experimentally investigate and theoretically analyze the effect of microwave controlled atomic ground state coherence on phase-dependent amplification (PDA) an optical probe field. use three hyperfine levels in room temperature 85 Rb atoms, which are cyclically connected by two one electromagnetic show that a simultaneous fulfilment two-photon resonance condition creates three-photon leads t...

This work reports a multipurpose highly linear ultrawideband amplifier with gain-bandwidth product (GBP) of 1.75 THz, the highest reported in any monolithic microwave integrated circuit (MMIC) process. A transimpedance is cascaded distributed amplifier, emulating receiver subsystem. Using diamond heat spreader, to dissipate from transistors, amplification subsystem can achieve very high output ...

The demonstration of a 75-305-GHz power amplifier (PA) monolithic microwave integrated circuit (MMIC) is presented in this letter. PA based on an eight-cell traveling-wave unit (UA). Each cell contains RF cascode with two two-finger transistors gate width 20 ?m each. In the output stage, balanced configuration combines UAs Lange couplers. front, third UA used as driver amplifier. MMIC fabricate...

we propose and demonstrate a bandpass microwave photonic filter (MPF) with ultrahigh stopband attenuation and skirt selectivity based on a simple signal cancellation technique. By injecting two phase modulated signals located on opposite sides of two resonant gain peaks of a Fabry-Pérot semiconductor optical amplifier (FP-SOA), two microwave frequency responses can be generated by the two input...

YONG-CHAE JEONG Chonbuk National University Chonju, Korea SI-GYUN JEONG Samsung Electronics Gyeonggi-Do, Korea JONG-SIK LIM Korean Intellectual Property Office (KIPO) Daejeon, Korea CHUL-DONG KIM Sewon Teletech Inc. Kyeonggi-Do, Korea Recently, extensive research efforts on photonic band gap (PBG) structures where periodic patterns are etched on the ground plane of microstrip lines have been co...

Quasi-optical (QO) active circuits have originally received interest for power generation by large-scale power combining of solid-state devices at microwave and millimeter-wave frequencies. Here, we present an overview of QO components developed with functionality in mind, with an emphasis on bidirectional amplifier arrays for transmit/receive (T/R) front ends. We discuss possible advantages of...

Research centers and industries often need to measure the microwave electromagnetic emission of hot bodies, in order to calculate their temperature. It is well known that the most critical part of a microwave radiometer is its receiver, to obtain a very sensitive system that can also measure low emissions this needs, among other features, to be very sensitive, necessitating the use of expensive...