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.

A novel and useful fully integrated switched-mode wideband 60 GHz power amplifier architecture. Using an appropriate second-harmonic termination of its output matching network, the required systematic peak current of the final stage is reduced such that the PA functions as a class-E / F2 switched-mode PA at saturation. In addition, low / moderate magnetic coupling factor transformers in the intermediate stages enable the PA to reach a high power added efficiency (PAE) and bandwidth product. Transformers of low / moderate coupling are also utilized in the preliminary stages of the PA to improve the overall bandwidth. In addition, the PA exploits the different behavior of the output impedance matching network for differential mode (DM) and common mode (CM) excitations. The PA is also stabilized against the combination of DM and CM oscillation modes. The PA also provides a technique to stabilize transformer-based mm-wave amplifiers against various modes of undesired oscillations.

The invention relates to a serial-parallel connection modulation optical frequency multiplication millimeter-wave RoF (Radio Over Fiber) system and a QPSK (Quadrature Phase Shift Keying) / 16QAM (Quadrature Amplitude Modulation) modulation method thereof. The system comprises a central station, a base station and fiber connection thereof, wherein the central station comprises a single longitudinal mode laser, a double-electrode Mach-Zehnder optical modulator, an IQ optical modulator, two microwave signal sources, a pi phase shifter, a pi / 2 phase shifter and an erbium doped fiber amplifier; and the base station comprises an optical detector, a front low-noise amplifier, two millimeter-wave bandpass filters, two millimeter-wave amplifiers, a millimeter-wave duplexer and a millimeter-wave antenna. In the method, the cascading of the double-electrode Mach-Zehnder optical modulator and the IQ optical modulator is adopted, and a balanced optical waveguide structure formed by integrating the two optical modulators avoids the influence of optical source phase interference noise caused by support arm optical delay inequality on modulation signals.

A description is provided of a high-frequency, multi-stage, millimeter wave amplifier integrated circuit, and of a method for designing and constructing the circuit. The methods and structures have been created to enable the construction of an amplifier offering substantial gain at a relatively high power and high frequency, but occupying minimal area of an integrated circuit die. Various structures and methodologies are described which each contribute to the practical feasibility of constructing an amplifier with such performance in a relatively compact space.

The invention discloses a millimeter wave probe device and a millimeter wave control method for monitoring a weapon hidden on a human body. A millimeter wave probe consists of a millimeter wave antenna, a millimeter wave amplifier and a millimeter wave detector which work at the millimeter wave frequency, a direct-current amplifier, a signal processing unit and a power supply unit which work at low frequency, and a personal computer (PC). When the millimeter wave probe performs monitoring, the human body advances towards the millimeter wave probe, the millimeter wave probe outputs a monitoring signal to the PC from the moment when the human body enters a millimeter wave probe monitored area to the moment when the human body leaves the millimeter wave probe monitored area; if the weapon is not hidden on the human body, the monitoring signal output by the millimeter wave probe to the PC is an approximate bell-shaped pulse signal, and the PC makes judgment that the weapon is not hidden on the human body and sends a release command; if the weapon is hidden on the human body, the monitoring signal output by the millimeter wave probe to the PC is a non bell-shaped pulse signal which has the characteristic that the top of the signal is sunk, and the PC makes judgment that the weapon is hidden on the human body and sends an alarm command.

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.