57results about How to "Good standing wave characteristics" patented technology

The invention relates to a dielectric loaded wideband miniature dual circularly polarized antenna, in particular to a dual circularly polarized antenna which is applied to emit and receive dual circularly polarized waves and wide in frequency band, low in standing wave, high in gain and large in power capability. The dielectric loaded wideband miniature dual circularly polarized antenna comprises a dual circularly polarized radiator (1) and a frustum reflector (2), the dual circularly polarized radiator (1) comprises a medium (3), a square waveguide (4), a step partition (5) and coaxial joints (6 and 7), and the medium is teflon. A partition circular polarizer is used to directly feed, and signals are radiated into the space through dielectric loading and reflection of the reflector, so that good standing-wave characteristics are guaranteed while wave beams are widened, gain and axial ration within a range of pitch angle of +/-65 degrees are guaranteed to meet requirements, and bandwidth is wide. In addition, a symmetric structure is adopted, so that radiating performances of left and right rotating circularly polarized waves are guaranteed to be consistent.

The invention provides a reconfigurable mono-pulse antenna. The reconfigurable mono-pulse antenna comprises fourantenna units arranged along longitudinal and transversal directions in a two-dimensional array manner, four switches in one-to-one correspondence with the antenna units, and a one-to-four equal-amplitude and equal-phase-position power distributor; each antenna unit comprises two feed ports; the feed ports at the two ends of each antenna unit are connected with the switches respectively through finite ground coplanar waveguide transmission lines; among the ports at the two ends of the antenna units, only one port is in the working state though the switch control; and four branches of the one-to-four equal-amplitude and equal-phase-position power distributor are connected with the switches respectively, and can feed one port of the two ports of the four antenna units separately through the switch control. The input ports of the antenna units can be changed by changing the states of the switches so as to change the phase positions of the antenna units to form three different antenna patterns: sum beams, azimuth difference beams and pitch difference beams so as to realize mono-pulse positioning.

The invention discloses a miniature orthogonal broadband electric bridge. The miniature orthogonal broadband electric bridge comprises a two-sided copper-coated dielectric plate and two single-sided copper-coated dielectric plates, wherein microstrip circuits with same structure are respectively etched on a front surface and a back surface of the two-sided copper-coated dielectric plate, each microstrip circuit comprises two N-order Lambda-fourth impedance matching transmission lines which are symmetrically arranged, N is equal to 2, 3 until 10, ends of the two Lambda-fourth impedance matchingtransmission lines are connected via a 50-ohm impedance line, an open-circuit branch is arranged at a connection position of the Lambda-fourth impedance matching transmission lines, the two single-sided copper-coated dielectric plates are respectively laminated onto the front surface and the back surface of the two-sided copper-coated dielectric plated etched with the microstrip circuits to forma deviation strip line-structure directional coupler, four ports of the two microstrip circuits are respectively an input port, a direct-through port, a coupling port and an isolation port, the inputport and the direct-through port are arranged in the same microstrip circuit, the coupling port and the isolation port are arranged in the same microstrip circuit, and the direct-through port and thecoupling port are arranged at the same side.

The invention discloses a micro-wave low-band ultra-micro matching PIN diode electronically controlled attenuator, which is applied to various microwave systems such as radars, electronic countermeasure, communication and so on, and comprises a transmission line and a bias line led out from the transmission line, wherein a PIN diode is codirectionally connected at N nodes, which have an interval of one fourth wavelength and have the quantity of more than or equal to 2, with the transmission line respectively and then is earthed to ensure that the N PIN diodes are parallelly connected to the transmission line, the PIN diodes at both sides are serially connected with a 50ohm resistor respectively, and circuits are produced on a ceramic substrate. The circuit design achieves good standing wave property and flatter attenuation characteristic and can better improve the matching of input ports; the designed circuits of the electronically controlled attenuator with a micro-wave matching form are produced on the ceramic substrate; the circuits have good consistency, and the micro-wave low-band ultra-micro matching PIN diode electronically controlled attenuator has the advantages of high integration level, small volume, simple structure and so on.

Provided is a broadband millimeter wave antenna. The antenna comprises an upper rectangular metal block, a lower rectangular metal block, and an intermediate dielectric substrate, one sides of the upper rectangular metal block and the lower rectangular metal block are respectively provided with a metal arm in an extended manner, the two metal arms are in mirror symmetry with respect to the dielectric substrate, the distances between two opposite surfaces of the metal arms are equal, the distances between two surfaces, which are face to face, of the metal arms are gradually increased along the length direction, a V-shaped radiation opening is formed, the end of the radiation opening forms a horn-shaped mouth portion, one end, with large diameter, of the mouth portion, is arranged towards the outside of the radiation opening, the upper surface and the lower surface of the dielectric substrate are metal surfaces, the dielectric substrate is provided with a switching circuit and a substrate integrated waveguide along the length direction, the switching circuit is arranged from a microstrip line to the substrate integrated waveguide, an output end of the substrate integrated waveguide is provided with a dielectric plate in an extended manner, the width of the dielectric plate is gradually reduced along the length direction, and the dielectric plate stretches into the radiation opening. The antenna is advantaged by wide bandwidth, low cost, small size, simple and compact structure, and easy integration and array organization.

The invention discloses a broadband low-profile antenna with a reconfigurable directional diagram. The broadband low-profile antenna comprises four antenna units which are distributed in a two-dimensional array in vertical and horizontal directions, four switches in one-to-one correspondence to the antenna units, and a one-into-four equal-amplitude equal-phase power distributor, wherein each antenna unit is provided with two feed ports; the feed ports of each antenna unit are connected with the switches through a corresponding microstrip transmission line (7); four branches of the one-into-four equal-amplitude equal-phase power distributor are connected with the switches respectively; and the switches are used for controlling the equal-amplitude equal-phase power distributor to be fed to one of the two ports of each antenna unit separately for realizing that only one of the two ports of each antenna unit is in the working state. The broadband low-profile antenna has the advantages of low profile, broad band, simple structure, easy integration, as well as consistency, easy realization, low cost and the like.

A suspended strip line ultra-wideband zero-point-adjustable band-pass filter disclosed by the invention is small in area, high in integration level and excellent in standing wave performance. According to the technical scheme, at least two resonators and a double-layer metallization coupling via hole which are arranged between double rows of metallization coupling via holes are distributed on the front face and the back face of a dielectric substrate, and each resonator is jointly composed of a main resonator located on one side and a resonator loading capacitor located on the other side; the resonator loading capacitors of all the resonators are connected with the metal ground at the two sides of the dielectric substrate; and transmission lines at the two ends achieve connection of the upper layer and the lower layer through a metalized through hole, and the self-resonant frequency of each resonator can be adjusted by adjusting the size of the resonator loading capacitor on the back face of the dielectric substrate of the resonator. The size of the capacitance loading part is increased, so that the self-resonant frequency of the resonators shifts towards the low-end direction of the frequency, the capacitance loading size of the back surface of the resonators is reduced, the self-resonant frequency of the resonators shifts towards the high-end direction of the frequency.

The invention discloses a frequency polarization reconfigurable patch antenna. The antenna includes a dielectric substrate, the upper surface of the dielectric substrate is provided with a metal patch, The lower surface of the dielectric substrate is provided with a ground plane, and the antenna further comprises three groups of ground via holes arranged in the dielectric substrate, wherein the ground via holes connect the metal patch and the ground plane, and the antenna further comprises two pairs of controllable perturbation parts arranged on the metal patch, wherein the three groups of ground via holes and the two pairs of controllable perturbation parts are connected with switches respectively. The antenna can work at different frequencies by changing the states of three groups of ground via holes. The antenna has three different polarization characteristics: linear polarization, left-handed circular polarization and right-handed circular polarization, and satisfies better polarization characteristics, better standing wave characteristics, small gain fluctuation, low profile, small volume, simple implementation and easy integration.

The invention discloses a polarized reconfigurable antenna. The polarized reconfigurable antenna comprises a dielectric substrate (1), an upper metal layer (21), a lower metal layer (22), a pair of controllable grounding through holes (5) with symmetrical structures, and more than two metal through holes (41) in array configuration to form a cavity body (4); the upper metal layer (21) is provided with an antenna radiation structure while the lower metal layer (22) is provided with an antenna feed structure; the grounding through holes (5) are connected with a switch separately; and the switch is used for controlling the grounding states of the grounding through holes (5) to realize different current disturbances. By changing the switch state, namely, changing the states of the pair of controllable grounding through holes, current disturbances are changed to form three kinds of different polarized waves, including linear polarization wave, left-hand circular polarization wave and right-hand circular polarization wave, thereby realizing the polarized reconfigurable antenna.

The invention discloses an ultra-wideband adjustable phase shift unit loaded with a fan-shaped line reflection load and a phase shifter. The ultra-wideband adjustable phase shift unit comprises an input node, an output node and a quadrature coupler. An input node for receiving a to-be-phase-shifted signal is connected with the input end of the quadrature coupler. An output node for outputting a phase shift signal is connected with an isolation end of the quadrature coupler. The straight-through end and the coupling end of the quadrature coupler are respectively connected with a single-port variable reflective load unit. According to the invention, a reflective phase-shifting circuit architecture of the quadrature coupler is adopted, so that good input and output standing wave characteristics can be realized in an octave range, a relatively large phase-shifting range and relatively low additional amplitude change are further realized in an ultra-wideband range, and the problem of circuit consistency caused by process fluctuation in production is greatly reduced.

The invention provides a novel high-frequency broadband power amplifier comprising a frequency bandwidth expansion circuit, a broadband matching circuit and a power amplifier circuit, wherein the frequency bandwidth expansion circuit comprises a first power supply, a second power supply and an input end, a resistor, a first inductor and a first capacitor are sequentially connected in series between the first power supply and the input end, a first transistor and a second transistor are connected between two ends of the first inductor in parallel, a second inductor is connected between the drain electrode of the first transistor and the drain electrode of the second transistor, a third inductor is connected between the drain electrode of the second transistor and the second power supply, the broadband matching circuit comprises a microstrip line, and the drain electrode of the first transistor is connected with the microstrip line through a second capacitor. According to the novel high-frequency broadband power amplifier provided by the invention, two transistors are connected in parallel to expand the frequency bandwidth, thereby simplifying the circuit design, and ensuring a simple circuit design form, a small size, high efficiency and a low cost on the premise of satisfying high frequency, broad frequency band and high power output.

A microwave attenuator based on a novel topological structure comprises a plurality of periodical absorption structures, thin-film resistors and matched microstrip lines. Each periodical absorption structure comprises a low-impedance microstrip line and a resistor, grounding through punching is not needed, even absorption of high-frequency microwave signal energy is achieved, attenuation values of microwave signals of various frequencies in a working bandwidth are the same, reflection signals of any frequencies in the bandwidth can be reduced to an extremely-low level, and good matching is achieved. Compared with a traditional thin-film resistance attenuator, application frequency is substantially improved, in-band standing waves are improved, in-band flatness is good, punching is not needed, and the technology can be realized more easily.

The invention relates to a lightning-protection reflection type high-strength dual-waveband directional antenna. The lightning-protection reflection type high-strength dual-waveband directional antenna comprises a metallic reflection cavity, wherein microstrip plates are arranged in the metallic reflection cavity; a multiplexer is arranged on the microstrip plates; a coaxial cable is connected onto a main circuit of the multiplexer; a first radiation oscillator and a second radiation oscillator are respectively connected onto a first branch and a second branch of the multiplexer; a solid antenna housing covers on the first radiation oscillator and the second radiation oscillator; the solid antenna housing is provided with a lightning-protection reflection oscillator; the lightning-protection reflection oscillator is located at the same side of the first radiation oscillator and the second radiation oscillator; the first radiation oscillator and the second radiation oscillator adopt hollow sail-shaped unipolar metal oscillators; the hollow sail-shaped unipolar metal oscillators consist of first metallic straight strips, second metallic straight strips and arc-shaped metallic strips; the first metallic straight strips, the second metallic straight strips and the arc-shaped metallic strips are connected with one another in an end-to-end manner; angles formed by the first metallic straight strips, the second metallic straight strips and the arc-shaped metallic strips are acute angles; and metal blocks are arranged or directly welded on the hollow sail-shaped unipolar metal oscillators so as to form an inner-and-outer embattlement type structure.

The invention discloses a directional diagram and polarization reconstructable antenna which comprises four antenna units and four switches that are in one-to-one correspondence with the antenna units. Each antenna unit has two pairs of controllable perturbation parts. The two pairs of controllable perturbation parts are respectively connected with the switch which corresponds with the antenna unit. The switch is used for controlling the state of the perturbation part, thereby changing disturbance to the current. Each antenna unit comprises three feeding ports. The feeding ports of each antenna unit are connected with the switch which corresponds with the antenna unit with the feeding ports by feeding probes through transmission wires. The transmission wire is divided into two parts by a first equal-phase equal-amplitude power divider. Each part is divided into two parts by a second equal-phase equal-amplitude power divider. The finally divided four parts are connected with four switches. The directional diagram and polarization reconstructable antenna can realize the directional diagrams in different directions and furthermore can realize left-hand circular polarization and right-hand polarization.

The invention discloses a small-sized antenna for medium and short wave band ships. It consists of four components: a dielectric layer, a wire layer, a coaxial feeder, and a grounding plate; the wire layer is a planar structure, engraved on the upper surface of the dielectric layer, and consists of a number of curved wire segments connected end to end. Based on two six-order Hilbert fractal structures, the ends of the wires are connected by a short wire; the antenna is installed vertically on the upper surface of the ground plate, and a hole is opened at the geometric center of the ground plate, and the coaxial feeder is connected to the antenna through the hole of the ground plate. Experimental data show that the antenna prototype can work in the medium and short bands of 2-8MHz, and has the characteristics of small size, wide frequency band, low profile, omnidirectional, and suitable for ships. The invention can not only be used in the marine radio navigation system, but can also be extended to other related systems.

The invention discloses a 1w 28DB attenuating plate for high heat-conductivity aluminum oxide ceramic substrate; the attenuating plate comprises a ceramic substrate with a high thermal conductivity factor, wherein the ceramic substrate is made of aluminum oxide ceramic; the ceramic substrate is printed with two symmetrical pads, two leads are respectively drawn out from the two pads; a membrane-shaped resistor is printed between the leads and connected with the leads so as to form an attenuating circuit, wherein the attenuating value of the attenuating circuit is determined based on the fine resistance adjustment of the membrane-shaped resistor. Each performance index is sufficiently considered on design of the attenuating plate so as to make the attenuating plate non-inductive at high efficiency, so that the situation that the initial 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 1w fixed membrane-shaped resistor type attenuating plate is extended.