47 results about "Millimeter wave amplifiers" patented technology

The invention is an improvement in microwave and millimeter wave amplifiers. Capacitors are connected in parallel with the source and drain terminals of all of the amplifying elements in a series of such elements except the first, compensating for current leakage due to gate capacitance. This results in improved synchronism of the amplifying elements, and improved overall efficiency and circuit performance.

The invention is applicable to the technical field of amplifiers and provides a dielectric-free high-frequency extensible-broadband high-performance waveguide amplifier. The waveguide amplifier comprises an upper cavity, sheets and a lower cavity which are integrated, wherein the sheets are positioned between the upper cavity and the lower cavity. A metal ridge is formed on wide sides of the lower cavity, and the metal ridge and the sheets form an imbalance-to-balance conversion structure, so that conversion from a waveguide field mode to a coplanar waveguide field mode is achieved. The waveguide amplifier has the advantages that bad influences such as dielectric loss, resonance and the like caused by dielectric substrates can be eliminated completely, performances of the millimeter wave amplifier designed based on a circuit are improved greatly, and particularly, the higher the frequency is, the more obvious the advantages displayed by the amplification circuit are.

The present invention relates to a system for generating a two-way light phase modulation millimeter wave and providing remote local oscillator in a millimeter wave optical fiber transmission system and a method thereof. The system comprises a center station and a base station. The center station is composed of a laser, two polarization controllers, a double-electrode Mach-Zehnder modulator, a microwave difference power amplifier, a light intensity modulator, an optical fiber amplifier and the like. The base station is composed of a photodetector, a front low-noise amplifier, a power divider,two band-pass filters, two millimeter wave amplifier and a millimeter wave transmitting antennae. In the method, a single mode laser is divided into two routes at the center station. Two opposite-phase 5GHz cosine microwave signals are used for phase modulating with large modulation index to the two routes of optical wave. The two routes of optical waves are overlapped. The phase variation of theoptical wave is switched to a strength variation through a FM-IM effect. The strength variation comprises a microwave signal and a high order component thereof. The millimeter wave signal is obtainedby extracting the high order harmonic. Then the optical fiber is executed with a strength modulation with a 2GHz BPSK signal and a mode of regulated subcarrier through a light intensity modulator. A 40GHz millimeter wave remote reference local oscillator and a 38GHz BPSK signal are obtained at the base station. The number of optical frequency doubling gets to 8, and the speed of baseband data transmission gets to 200Mbps.