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

The invention provides a CSRR structure-based ultra-wideband electrical tunable equalizer. A stepped impedance type microstrip is adopted as a main transmission line, notch units are connected betweenthe main transmission line and bias loops, and each notch unit comprises a load absorption resistor, a CSRR resonance unit and a variable capacitance diode which are connected in series, wherein a capacitance value of the notch unit is adjusted by controlling a reverse voltage applied to the variable capacitance diode to adjust the center frequency and the equilibrium quantity of the notch unit.The CSRR structure-based ultra-wideband electrical tunable equalizer is low in path loss, can achieve wider-range power equilibrium and can precisely control frequency points and frequency bands whichneed be equalized.

The invention discloses a waveguide ring coupler comprising a main waveguide, a coupling hole is formed in the side wall of the main waveguide, a coupling cavity is connected with the position of the coupling hole of the main waveguide, a coupling ring is arranged in the coupling cavity and connected with a coaxial port, moreover the coaxial port is arranged outside the coupling cavity, besides, transition steps are connected with the two ends of the main waveguide, and standard waveguides are arranged at one ends, far from the main waveguide, of the transition steps. Due to the fact that a main wire is of a waveguide structure, an auxiliary wire is coaxial, and a coupling mechanism is achieved by the single round hole, the waveguide ring coupler has the advantages of being simple in circuit, novel in structure, convenient to process and assemble, dispensed with tuning, moreover small in insertion loss, good in standing wave of the port, high in reliability, and specially suitable for the occasion of high-power bi-direction weak coupling degree measurement and indication.

The present invention discloses a super high frequency (SHF) wave band high-performance filter bank based on the low temperature co-fired ceramic (LTCC) and defected ground structure (DGS) technology. The filter bank comprises a single-pole double-throw switch at a SHF wave band and two filters with two different frequency bands; the single-pole double-throw switch comprises two ports which are a signal input port, a first signal output port, a second signal output port, a first output selection control end and a second output selection control end; and the first signal output port is connected with an input port of a first microwave filter while the second signal output port is connected with an input end of a second microwave filter. The two filters both adopt a stripline structure with five-level resonance, and are realized by adopting the LTCC technique. Excellent properties such as small insertion losses, small passband fluctuation, transitional zone steepness and excellent out-of-band rejection of the two filters are combined, and the filter bank is excellent in stability, reliable in electric performance, and applicable to separation treatment of different frequency portions in one circuit of signal or to other occasions with strict requirements and corresponding systems.

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 invention discloses a radio frequency PCB connecting structure and connecting method. The radio frequency PCB connecting structure comprises a first PCB and a second PCB. The first PCB is arranged above the second PCB, a first radio-frequency circuit is arranged on the top layer of the first PCB, a first signal welding disc is arranged on the bottom layer of the first PCB, and the first radio-frequency circuit is electrically connected with the first signal welding disc through a signal through hole; a second radio-frequency circuit is arranged on the top layer of the second PCB, a second signal welding disc corresponding to the first signal welding disc is arranged on the second radio-frequency circuit, and the first signal welding disc and the second signal welding disc are welded. According to the radio frequency PCB connecting structure and connecting method, the first radio-frequency circuit is communicated with the first signal welding disc through the signal through hole, then the first signal welding disc and the second signal welding disc located on the second radio-frequency circuit are welded, and signal communication between the first radio-frequency circuit and the second radio-frequency circuit is achieved.

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 present invention relates to a dual-end floating coaxial radio frequency adapter. A semi-flexible coaxial line is connected between two radio frequency plug terminals at two ends of the adapter, the semi-flexibility of the semi-flexible coaxial line can meet the axial and radial floating requirements, the features of the semi-flexible coaxial line determines that the semi-flexible coaxial linecan meet the phase consistency which must be met by the adapter, the inner and outer conductors of the semi-flexible coaxial line are electrically connected with an inner conductor module and an outer conductor of the two radio frequency plug terminals, radio frequency signals can be transmitted in a thickness-equal insulation medium between the inner and outer conductors of the semi-flexible coaxial line, the equal distance between the inner and outer conductors of the semi-flexible coaxial line can be achieved depending on the insulation layer in an annular so that the problem of impedancechange caused by varying of cross sections is avoid, the voltage standing wave is good, and the transmission quality of the radio frequency signals is greatly improved.

The invention discloses a 30w 24dB attenuating plate of an aluminum nitride ceramic substrate, the 30w 24dB attenuating plate comprises an aluminum nitride substrate in size of 5mm*5mm*1mm, wherein the back surface of the aluminum nitride substrate is printed with a back conductor layer, and the front surface of the aluminum nitride substrate is printed with a lead and a resistor, wherein the lead is drawn out from the centre of a pad, and the lead is connected with the resistor so as to form a TT (telegraphic transfer) type attenuating circuit which is symmetrical along the centre line of the aluminum nitride substrate; the output end and the input end of the attenuating circuit are respectively connected with one bonding pad. Each performance index of the attenuating plate is sufficiently considered in design so as to make the attenuating plate non-inductive at high efficiency, so that the situation that the original attenuating plate is applied to the low frequency only is broken, the application requirement of the current 3G (third-generation) network is met, and the series product line of the 30w fixed resistor type attenuating plate is extended.

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 present invention discloses a coplanar waveguide ultra wide band sum-difference device. The coplanar waveguide ultra wide band sum-difference device comprises two oppositely arranged metal cavities, two dielectric plates arranged between the two metal cavities and a copper-clad plate arranged between the two dielectric plates. The copper-clad plate comprises a dielectric substrate and sum-difference circuits formed at two sides of the dielectric substrate; each sum-difference circuit comprises one first transmission line arranged at the first surface of the dielectric substrate, a first T-shaped branch and a second T-shaped branch led out of the first transmission line, a second transmission line arranged at the second surface of the dielectric substrate, and a third T-shaped branch and a fourth T-shaped branch led out of the second transmission line, the first transmission line and the second transmission line are electrically connected through a metal via hole formed on the dielectric substrate, and one end, corresponding to the fourth T-shaped branch, of the first transmission line and one end, corresponding to the second T-shaped branch, of the second transmission line arearranged in a short-circuit mode. The coplanar waveguide ultra wide band sum-difference device can achieve good standing waves, amplitude and phase features at a region close to a double frequency region.

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.