44results about How to "Gain fluctuation is small" patented technology

A kind of broadband and broad-beam micro-strip antenna unit adopts keyhole coupling and multi-layer micro-strip technology and made up by four rectangular metal patches whose lengths and widths are parallel and three layers of medium layer. The third metal patch is grounding, and the fourth metal patch is micro-strip transmission line. Metal cylinder crosses a rectangular hole at the middle of metal patch without touching it, and its upper end connects with the second metal patch and its bottom end connects with micro-strip transmission line. Count to get the length and width of the first andsecond metal patch, the diameter of metal cylinder, length and width of rectangular hole, the thickness of each layer of medium, the length and width of micro-strip transmission line according to user's request. Adjust the place of metal cylinder crossing the rectangular hole according to the resonance frequency and matching instance. The frequency of micro-strip antenna unit is 3% to 10%, the unit standing wave of broadband VSWR is not bigger than 2.5, the width of unit wave arrives to 120 degree and gain undulation inside the taper space is less than 5dB.

The invention discloses a hemispherical broadband electrified small antenna based on the near-field coupling principle, and belongs to the technical field of antenna design. The antenna consists of outer metal radiation strips, an inner metal radiation strip, a hemispherical dielectric substrate, a grounding plate and a coaxial cable. The outer surface of the dielectric substrate is closely provided with the annular outer metal radiation strips with different lengths at regular intervals in an attached manner. The inner surface of the dielectric substrate is provided with the inner metal radiant strip in a pasted manner. The hemispherical dielectric substrate covers the grounding plate. The antenna adopts a bottom feed mode, an outer conductor of a feeder is connected with the grounding plate, and an inner conductor is connected with a metal strip on the inner surface of the dielectric substrate. The antenna provided by the invention has the advantages of small size and wide bandwidth,and the antenna structure is novel, simple to manufacture and easy to install. The antenna has low profile characteristics, has the advantage of working in a wide frequency range, and can be appliedto application communication, such as satellite navigation and wireless local area networks.

The invention discloses a broadband Doherty power amplifier based on a single parallel resonant block, which includes: a broadband input power splitter; The network is cascaded in sequence; the peak amplifier circuit is mainly composed of the second input matching network, the peak amplifier T2, and the second output matching network; the combined resonant circuit, the combined resonant circuit includes a parallel resonant block, mainly It is formed by connecting the transmission line inductance L1 and the lumped capacitance C1 in parallel; the constraint condition M for selecting the inductance of the transmission line inductance L1 is: when the two ends of the parallel resonant block are connected to the Ropt end load, the amplitude of S11 of the parallel resonant block is not Greater than ‑15dB, and the absolute value of the S21 phase is not greater than 10°. The invention has low insertion loss, compact structure and smaller overall volume, which is beneficial to miniaturized design and saves cost.

The invention discloses a broadband multi-patch antenna, which includes sequentially arranged from top to bottom: a first layer structure, including a top layer multi-patch structure; a second layer structure, including a substrate integrated resonant cavity, and a substrate integrated resonant cavity The top is provided with a top middle groove and two side grooves, the bottom is provided with a bottom middle groove, and the two side grooves are arranged on both sides of the top middle groove and are symmetrical about the top middle groove; the third layer structure, including the feed structure, is used for Feed and couple the signal into the substrate integrated resonant cavity through the bottom middle slot, thereby exciting the mode signal, which radiates through the two side slots and couples with the first mode of the top multi-patch structure, At the same time, the mode signal is also coupled to the first mode and the second mode of the top multi-patch structure through the top middle groove. The invention can generate three effective radiation working modes to further expand the working bandwidth of the antenna, and can also realize efficient cavity-backed slot radiation to reduce gain fluctuation in the antenna band.

The invention relates to a common-caliber three-frequency multi-mode horn antenna, which belongs to the field of electronic science and technology. It consists of OMT, corrugated excitation section, optical wall horn section, and L-band feed section. The orthogonal mode coupler is located at the lowermost end of the antenna; the corrugated excitation segment is located above the OMT, the input end of the corrugated excitation segment is connected to the output end of the OMT, and the output port of the corrugated excitation segment is connected to the input end of the optical wall horn segment; the optical wall The horn section is located above the corrugated excitation section; the L-band feeding section is connected to the side wall of the light-wall horn section through a coupling port; the present invention adopts an orthogonal mode coupler to realize the S and C-band feeding, wherein the C-band passes through the straight-through port. Feeding, the S-band is fed through the coupling port on the sidewall, and the polarizations of the two ports are orthogonal. The high-order mode of the S / C band is excited by the partial corrugated excitation section with double groove depth, and the optical wall horn section is connected to form a multi-mode horn, which improves the polarization isolation of the S / C band and the beam equalization of the pattern, and reduces the In-band gain fluctuation, the performance is better than the optical arm horn antenna.

The invention discloses a slow wave structure of plane slot lines, belongs to the field of microwave electric vacuum technology, and relates to a traveling wave tube amplifier. The invention comprises a dielectric substrate (2) and a metal layer (1) located on the surface of the dielectric substrate (2). A groove line is engraved on the metal layer (1), and the shape of the groove line is a periodic bending curve. The present invention can prevent the unconstrained electrons from directly hitting the dielectric substrate due to disturbance, thereby effectively solving the problem of electron accumulation in the microstrip slow-wave structure; the vacuum device adopting the structure of the present invention has a lower operating voltage and its dispersion curve Relatively flat, so that the electron injection can be synchronized with the electromagnetic wave in a wider frequency band, and then realize the broadband design of the vacuum device; the coupling impedance curve of the vacuum device adopting the structure of the present invention is very flat, indicating that its gain fluctuation in the working frequency band Compared with the microstrip slow-wave structure, it is smaller. Therefore, the invention has great potential and market value in the slow wave structure of the miniaturized planar traveling wave tube.

The invention discloses a four-leaf-clover-shaped broadband circular-polarized planar antenna, relates to the technical field of wireless communication and aims to provide a broadband circular-polarized planar antenna which is high in mechanical reliability, high in processing precision and low in cost. The four-leaf-clover-shaped broadband circular-polarized planar antenna comprises an upper medium substrate, a medium support plate and a lower medium substrate, wherein the medium support plate is glued between the upper medium substrate and the lower medium substrate. The four-leaf-clover-shaped broadband circular-polarized planar antenna further comprises a phase-shift power feeding network arranged on the lower surface of the lower medium substrate, a four-leaf-clover-shaped radiation paster including four metallic pasters, two coupling arms, a metallic floor positioned between the medium support plate and the lower medium substrate, and six short-circuited through holes, among which four are respectively and electrically communicated with the four metallic pasters and the metallic floor, and the other two are respectively and electrically communicated with the two coupling arms and two output ends of the phase-shift power feeding network.

The liquid crystal electronically controlled zero-crossing scanning leaky wave antenna based on the comb-shaped waveguide belongs to the technical field of microwave antenna engineering. The frequency band and the existing liquid crystal electronically controlled fixed-frequency scanning leaky-wave antenna are not easy to achieve zero-crossing scanning and require a specially designed bias circuit. The invention includes a top dielectric plate layer, a metal layer, a liquid crystal layer and a bottom waveguide groove; a metal layer is arranged between the top dielectric plate layer and the bottom waveguide groove, and the bottom waveguide groove is a rectangular plate with a longitudinal groove structure on the upper surface; the metal layer It is a comb-like line structure, and N periodic slit units are arranged between two rows of comb teeth on the comb-like line structure. Transverse slits increase the equivalent series inductance when electromagnetic waves propagate between the bottom waveguide slot and the metal layer, and periodic longitudinal slits increase the equivalent parallel capacitance.