34results about How to "Good standing wave" patented technology

The invention discloses a variable vector hybrid superimposed predistortion linearization method suitable for improving the linearity of a microwave millimeter wave solid-state power amplifier. According to the variable vector hybrid superimposed predistortion linearization method, on the basis of the working mechanism of the traditional diode reflected predistortion linearization, an effect of phase compression generated by gain expansion with the increase of the input power is realized by using the variable vector hybrid superimposing principle, good port standing wave is realized, and the purpose compensating the nonlinear distortion of the solid-state power amplifier within the microwave millimeter wave broad band is realized. By adoption of the variable vector hybrid superimposed predistortion linearization method, the defect that the traditional reflected simulated predistortion technology can only generate phase expansion with the increase of the input power and is only applicable to linear traveling wave tube power amplifiers, breaks through the limitation of the reflected predistortion circuit bandwidth; and the variable vector hybrid superimposed predistortion linearization method has the advantages of novel structure, simple and compact structure, easy processing and assembly, and is suitable for popularization and application in the technical field of microwave millimeter wave predistortion linearization.

The invention belongs to the field of PCB circuit design, in particular to a differential pair interface based on a circulator. The differential pair interface includes a microstrip hybrid ring, the input terminal of the microstrip hybrid ring is connected to a 50Ω RF port, and the isolation terminal of the microstrip hybrid ring is connected to a 50Ω surface mount resistor; the differential pair interface also includes a differential pair line, forming a differential pair The input port of each microstrip line of the line is connected to the microstrip hybrid ring via a matching balun: the microstrip hybrid ring, 50Ω surface mount resistor, matching balun, and differential pair are attached to one side of the dielectric board , the other side of the dielectric board is covered with copper; the dielectric board is provided with an air cavity. The invention has compact structure and high working reliability, not only can directly convert the radio frequency signal into a differential signal on the PCB board, so as to be sent to the required integrated chip, but also can ensure the compactness and simplification of the overall structure, In order to meet the application requirements of increasingly miniaturized and integrated products.

The present invention is a resistive-based ultra-wideband six-way power divider, which includes thin film resistors, matching microstrip lines, and connecting plates; input signals enter the connecting plates through microstrip lines and thin film resistors in turn; the connecting plates divide the input signals into six channels They are respectively output to six branches, and then output by each branch; the connection plate is a semicircular connection plate. The invention reasonably selects the resistance value, and designs a special multi-channel interconnection plate, and simultaneously realizes the ultra-wideband of the six-way power divider from 0.1GHz to 8GHz and the miniaturization of 20mm×16mm, and has excellent performance and consistent amplitude in the whole frequency band Better than 2.1dB, the input standing wave is better than 1.8, the output standing wave of any port is better than 1.52, and the isolation is better than 14dB.

The invention discloses an ultra-wideband sum-difference device, which comprises a dielectric substrate and a conductor layer arranged on the dielectric substrate, wherein the conductor layer is provided with a sum-difference circuit, and the sum-difference circuit includes two coplanar waveguide T-shaped branches, two coplanar waveguide-slot line T-shaped branches and four coplanar waveguide-slotline transitions; the two coplanar waveguide T-shaped branches and the two coplanar waveguide-slot line T-shaped branches are arranged at intervals and mutually connected to enclose into a closed area, and one coplanar waveguide-slot line transition is connected between the adjacent coplanar waveguide T-shaped branch and the coplanar waveguide-slot line T-shaped branch. The ultra-wideband sum-difference device can achieve good standing wave, amplitude and phase characteristics and large sum-difference isolation close to the octave.

The invention discloses a low-profile dual-polarized indoor ceiling antenna of an access point of a 3.5 GHz (3.3-3.8 GHz) wireless local area network (WiFi / WiMax), and the dimensions of the wireless local area network is 188*188*20(mm). A feeder part of the low-profile dual-polarized indoor ceiling antenna is a microstrip line based on a standard printed circuit technique. A radiating unit is formed by four groups of main incentive units of all-steel structures and nine spurious resonance units. The low-profile and flat dual-polarized indoor ceiling antenna conducts optimal design on the access point of a wireless local area network system with the work efficiency at 3.3-3.8 GHz, has 500 MHz bandwidth, 15.5+ / -0.5 dBi middle and high gains, a low cross polarization to co-polarization ratio of 20 dB and high port isolation degree of gt; 20 dB, and has the advantages of being simple in structure, small in size, low in cost and convenient to produce in batches, being capable of meeting requirements for planar circuit integration, etc.