32results about How to "Good harmonic suppression" patented technology

An electronic assembly includes a substrate (66), a balun transformer (42) formed on the substrate (66) and including a first winding (50) and a second winding (52), each having respective first and second ends, and a reaction circuit component (48) formed on the substrate (66) and electrically coupled to the second winding (52) between the first and second ends thereof. The balun transformer (42) and the reaction circuit component (48) jointly form a harmonically suppressed balun transformer having a fundamental frequency, and the reaction circuit component (48) is tuned such that the harmonically suppressed balun transformer resonates at a selected harmonic of the fundamental frequency.

The invention discloses and especially relates to a secondary harmonic inhibition method for a broadband helix travelling wave tube, and belongs to the technical field of broadband helix travelling wave tubes. Within a certain range, a travelling wave tube harmonic inhibition situation becomes greater if a distance between a fin to a center is reduced, however, the reduced distance will make the fin closer to a helix and might cause engineering machining troubles and many other potential troubles. Therefore, two different fin structures are adopted by an input segment and an output segment respectively, and the distance from a fin on the input segment to the center is made to be greater. Through the even and symmetric fin structure, a better harmonic inhibition effect is exhibited, and other factors in terms of the design of a travelling wave tube can be better weighed.

A harmonic rejection mixer having a phase rotator fed by a local oscillator signal. The local oscillator signal has a reference frequency. The phase rotator produces a plurality of output signals, each one of the signals having a common frequency related to the reference frequency and having different relative phase shifts. A plurality of mixer sections, each one of the sections being fed an input signal and a corresponding one of the plurality of output signals mixes the local oscillator signal with the corresponding one of the plurality of output signals fed thereto. A combiner combines the mixer signal from the plurality of mixer sections into a composite output signal. A detector detects energy in a harmonic of the composite signal and for adjusting the output signal of the phase rotator to reduce the selected harmonic of the composite signal.

The invention discloses a filter direct synthetic method. By means of the filter direct synthetic method, the transmission zero points of filters can be flexible arranged, a smoothing polynomial of the filters can be led out, and the smoothing polynomial includes all information of the filters and can be directly used for achieving the filters. Effective connection is conduced through some basic structures which can achieve one or more transmission zero points, an achieving network of the filters is finally obtained, and modularization synthesis can be achieved; the method can be used for designing digital filters through bilinear transformation; the types of the filters comprise the low-pass type, the high-pass type, the band-pass type, the band elimination type and the like. The filter direct synthetic method has the advantages of being simple, fast and accurate.

The invention discloses a 4.0-5.0 GHz 8W GaN monolithic power amplifier and a design method. The amplifier comprises an input matching network, an inter-stage matching network, an output matching network and pHEMT transistors; the input matching network is connected with the inter-stage matching network through one pHEMT transistor; the inter-stage matching network is connected with the output matching network through four pHEMT transistors; a gate bias power source is connected with the input matching network and the inter-stage matching network; and a drain bias power source is connected with the inter-stage matching network and the output matching network. According to the 4.0-5.0 GHz 8W GaN monolithic power amplifier and the design method of the invention, the design difficulty of a modular circuit is simplified, the size of the modular circuit is reduced significantly compared with the size of a traditional hybrid integrated circuit; the optimal load impedance and optimal source impedance of the transistors are determined; the circuit schematic diagrams of the input matching network, the output matching network and the inter-stage matching network are designed; indexes such as a stabilization coefficient, an input and output standing wave system, gain, power, efficiency and harmonic suppression are optimized; and the layout of the monolithic microwave power amplifier is designed.

A signal filter (100) comprises a first transferred impedance filter, TIF, (TIF_A) having four differential signal paths (P_A,1, P_A,2, P_A,3, P_A,4) and a second TIF (TIF_B) having four differential signal paths (P_B,1, P_B,2, P_B,3, _PB,4)−. A first differential signal port of the first TIF (32_A) is coupled to a first differential signal port of the second TIF (32_B). A first clock generator (12_A) is arranged to provide first-TIF clock signals (CLK_A,I+, CLK_A,Q+, CLK_A,I−, CLK_A,Q−) having four non-overlapping phases for selecting the respective first-TIF differential signal paths (P_A,1, P_A,2, P_A,3, P_A,4), and a second clock generator (12_B) is arranged to provide second-TIF clock signals (CLK_B,I+, CLK_B,Q+, CLK_B,J−, CLK_B,Q−) having four non-overlapping phases for selecting the respective second-TIF differential signal paths (P_B,1, P_B,2, P_B,3, P_B,4). The phases of the second-TIF clock signals (CLK_B,I+, CLK_B,Q+, CLK_B,Q−) are equal to the phases of the first-TIF clock signals (CLK_A,I+, CLK_A,Q+, CLK_A,I−, CLK_A,Q−) delayed by 45 degrees. The first-TIF first, second, third and fourth clock signals (CLK_A,I+, CLK_A,Q+, CLK_{A,I−L, CLKAQ−}) and the second-TIF first, second, third and fourth clock signals (CLK_B,I+, CLK_B,Q+, CLK_B,I−, CLK_B,Q−) have a duty cycle in the range 16.75% to 25%.

The invention relates to a TE01 mixing cavity filter device and provides an implementation method for a TE01 dielectric resonator and coaxial metal resonator mixing cavity filter. According to a mixed structure which integrates the advantages, such as high Qvalue and stable temperature coefficient of TE01 dielectric resonators as well as relatively far distance between higher-order modes and main modes of coaxial metal resonators, the TE01 dielectric resonators and the coaxial metal resonators are arranged in a mutually crossed manner, the TE01 dielectric resonators are assembled on the side surface of a cavity body, and the space between each coaxial metal resonator and each TE01 dielectric resonator is changed by moving a tuning plate so as to realize the purpose of tuning the frequencies of the TE01 dielectric resonators. The TE01 mixing cavity filter device disclosed by the invention is applicable to metal resonant cavity devices, such as a metal resonant cavity filter, a duplexer and a combiner which can satisfy out-of-band rejection, but cannot realize insertion loss under a condition of limited volume, and can be applicable to devices, such as a TE01 dielectric resonant cavity filter, a duplexer and a combiner which can satisfy out-of-band rejection and insertion loss, but cannot meet a coupling coefficient required by larger relative bandwidth.

A harmonic rejection mixer for carrying out a frequency translation of a mixer input signal having a mixer input frequency, the mixer including an up-conversion mixer for generating an intermediate signal by multiplying the mixer input signal with a first local oscillation signal having a first local oscillation frequency, and a down-conversion mixer for generating a mixer output signal by multiplying the intermediate signal with a second local oscillation signal having a second local oscillation frequency. The first local oscillation frequency and the second local oscillation frequency are greater than the mixer input frequency. The first local oscillation signal is an l-time oversampled sine wave and the second local oscillation signal is an m-time oversampled sine wave.

A microwave radiometer with reduced volume, mass, phase noise, and power requirements and increased harmonic rejection, includes a fixed number of frequency banks configured to provide signals within separate, non-overlapping local oscillation frequency bands, a detection circuit configured to detect one or more microwave RF signals, and an RF downconverter configured to mix the signals within the separate, non-overlapping local oscillation frequency bands with the one or more microwave RF signals to provide a continuous range of down converted frequencies.

Examples of a capacitive-coupled bandpass filter include a plurality of coupling capacitors connected in series along a signal path extending between an input contact and an output contact, a first harmonic suppression notch circuit configured to provide a first harmonic suppression notch in a frequency response of the capacitive-coupled bandpass filter, and a second harmonic suppression notch circuit configured to provide a second harmonic suppression notch in the frequency response of the capacitive-coupled bandpass filter. The first harmonic suppression notch circuit includes a first pair of series L/C resonators connected in shunt between the signal path and a reference potential, and the second harmonic suppression notch circuit includes a second pair of series L/C resonators connected in shunt between the signal path and the reference potential.