88results about How to "Good return loss" patented technology

A multiple mode feed horn is provided for transmitting and receiving signals. The feed horn includes a transverse electric throat section, a transverse electric profile section, and a transverse electric aperture section. The transverse electric profile section propagates a first transverse electric (TE) mode. The transverse electric aperture section propagates a second TE mode. The multiple mode feed horn prevents propagation of traverse magnetic modes from said throat section to said aperture section.

The invention discloses a device for transition from a rectangular waveguide to a substrate integrated waveguide on a Ka-band. The device comprises the rectangular waveguide, a first resonant cavity, the substrate integrated waveguide and a second resonant cavity, which are sequentially arranged from bottom to top, wherein the substrate integrated waveguide comprises a dielectric substrate, an upper metal sheet and a lower metal sheet; the upper metal sheet and the lower metal sheet are arranged on the upper surface and the lower surface of the dielectric substrate; a first coupling window is formed in the position, corresponding to a rectangular waveguide opening, of the lower metal sheet; and a second coupling window is formed in the position, corresponding to the second resonant cavity, of the upper metal sheet. The device has the advantages of small volume, small insertion loss and large bandwidth, and is suitable for application of right-angle transition of the Ka-band broadband, simple in structure, easy to fabricate and worthy of industry promotion; and mass production is achieved.

The invention discloses a broadband substrate integrated waveguide circulator and belongs to the technical field of microwave devices. The broadband substrate integrated waveguide circulator comprises a rectangular dielectric substrate 5, a back metal floor and a front metal pattern. A metal pattern 1 in a regular triangle shape is positioned in the middle of the front metal pattern, and the metal pattern 1, the dielectric substrate 5 and the back metal floor form a three-port substrate integrated waveguide structure in 120-degree rotational symmetry. The substrate integrated waveguide structure comprises a central round window, and a central junction gyromagnetic ferrite 3 is internally arranged in the round window. Three ports of the substrate integrated waveguide structure are formed by connecting three trapezoidal micro-strip transition lines 2 in quarter central wavelength with three 50-ohm standard micro-strip lines 6 serving as a T-type port and positioned at the edge of the substrate 5. The broadband substrate integrated waveguide circulator has high isolation performance within all X-bands (8.2GHz-12.4GHz), low insertion loss and low port standing waves, and has the advantages of miniaturization, high power, integration and low cost.

The invention discloses a rectangular waveguide microstrip airtight seal transition circuit, and aims at providing the rectangular waveguide microstrip airtight seal transition circuit of low insertion loss, broad band and all airtight. The rectangular waveguide microstrip airtight seal transition circuit is implemented through the following technical scheme: the radio frequency signal entering from the waveguide port (8) is totally reflected on the center of a coaxial step cylinder (6) through a waveguide short surface (10) so as to form the wave loop of the strongest electric field. The electric field in the rectangular waveguide (1) is coupled to the microstrip line (5) airtight sealed in a microstrip cavity (14) through a segment of coaxial inner conductor probe (11) having the coupling effect to complete electromagnetic field mode conversion between the dominant modes of the rectangular waveguide and the microstrip line, and thus transmission of the electromagnetic signal in two different transmission media can be realized. The rectangular waveguide microstrip airtight seal transition circuit is compact in structure, broad in band and great in sealing performance and can meetthe sealing requirement of the rectangular waveguide port in the practical engineering and can greatly overcome the problems caused by using the antipodal fin line and the ridge waveguide for transition.

An antenna assembly connectible to a radio frequency (RF) front end integrated circuit is disclosed. The antenna assembly includes a feed port connectible to a feeding line. There is a set of inner patch elements each having substantially identical first dimensions corresponding to a center resonant operating frequency, and also define perpendicular slots of predetermined lengths. The inner patch elements are in a spaced, parallel relationship. A set of outer patch elements each has substantially identical second dimensions. The inner patch elements are in a spaced, parallel and interposed relationship between the set of outer patch elements. A first electrically conductive element of the feed port is connected to a first one of the inner patch elements, and a second electrically conductive element of the feed is connected to a second one of the inner patch elements.

The invention discloses a device for converting substrate integrated waveguide to coaxial waveguide, belonging to the technical field of microwave and millimeter wave devices. The device comprises a substrate integrated waveguide connector and a coaxial waveguide connector; a row of short-circuit through holes are arranged in one end of the substrate integrated waveguide on which the substrate integrated waveguide connector is located to connect two metal layers; the upper metal layer of a dielectric substrate close to one end of the short-circuit through hole is provided with a round window with the size equal to the diameter of an outer conductor of the coaxial waveguide; and the circle center of the round window is located on the central axis of the substrate integrated waveguide; a rectangular groove is arranged at the center of a round dielectric substrate exposed outside the round window; the front end of an inner conductor of the coaxial waveguide connector is processed into a slice probe which is inserted into the rectangular groove; and the outer conductor of the coaxial waveguide is contacted and fixed with the upper metal layer of the dielectric substrate. The inter-conversion between substrate integrated waveguide and coaxial waveguide with low reflection and low loss is realized. The device is small in size and easy and convenient to assemble and disassemble and can be used repeatedly, which is convenient for the testing and the utilization of substrate integrated waveguide devices and systems.

The present invention is a low profile, wideband, high gain and high efficiency multi-band antenna with good return loss for wireless applications such as WLAN Access Point, ZigBee or WiMAX module, notebook computer, tablet computer and other mobile and portable devices applications and it can be used with any RF-front end circuitry that is working at 2.4-2.5 GHz, 3.1-3.4 GHz and 4.9-5.9 GHz frequency band. Moreover, the antenna assembly comprises a planar body sealed in a plastic housing with the feed pin and ground pin exposed for soldering onto a printed circuit board and thus it is easy for customers to assemble; they just need to solder the antenna pins on a printed circuit board and it will be operational. The flat structure and the plastic housing make the antenna to be low profile and compact in size so it can be easily fabricated and embedded into a notebook computer and tablet computer.

The invention provides a transmit-receive dual-polarized and dual-band feed source for a parabolic antenna system, a luneberg lens antenna system and the like in satellite communication. The feed source works at Ku band, has a rotational symmetric directional diagram with adjustable lobe width, a cross polarization level which is less than -35dB, high radiation performance such as return loss and transmit-receive isolation, has a simple, small and exquisite structure and high practicality, and can flexibly meet different requirements of different antenna systems.

The invention relates to a body surface communication antenna having a flexible substrate. The antenna comprises a flexible polyimide substrate and a copper paster pasted on the overall flexible polyimide substrate. The copper paster part includes a concave radiation paster, a strip-line paster and two ground-plane pasters with the same sizes; the strip-line paster and a long-horizontal-line paster arranged below the concave radiation paster forms an integrated part; the strip-line paster extends to the lower side line of the substrate; and the ground-plane pasters extend to the lower side line of the substrate and are arranged at the two sides next to the strip-line paster. A gap with the 1-mm width is formed between short-line horizontal pasters in the middle of the concave radiation paster; and gaps with the 0.15-mm widths are formed between the strip-line paster and the two ground-plane pasters at the left side and the right side. Therefore, defects that tight contact with the body skin and integration to a radio-frequency circuit can not be realized, the transmission efficiency is low, the gain performance is poor, and losses of communication along the human body surface are large can be overcome.

Disclosed is a millimeter wave Massive MIMO antenna unit. The antenna unit comprises a first metal layer, a second metal layer, a fourth metal layer, a sixth metal layer and a connector which are arranged at intervals from the top to bottom in sequence; the first metal layer comprises two parasitic patches; the second metal layer comprises two radiation patches; the fourth metal layer comprises two power dividers, and the two power dividers are electrically connected with the two radiation patches respectively; the sixth metal layer comprises a feeder line, and the feeder line is electricallyconnected with the two power dividers; and the connector is electrically connected with the feeder line. The antenna unit, by utilizing a multilayer PCB technology and a metalized via hole interlayerinterconnecting technology, can make full use of the vertical space; a millimeter wave Massive MIMO array antenna comprises the antenna units in arrangement in 8*16 array, wherein the adjacent two lines of antenna units are arranged in a staggered manner in the line direction, and the adjacent two lines of antenna units are arranged in a staggered manner in the column direction; H polarization isadopted as the polarization mode, and 28G is adopted as the frequency band. The array antenna is low in mutual inductance between array elements, high in electrical performance, compact in structure,low in cost and high in reliability.

The invention relates to a fractal defected structured quarter-mode substrate integrated waveguide bandpass filter which comprises the components of a dielectric substrate, metal patches which are arranged on the upper surface and the lower surface of the dielectric substrate, and metal through holes in the dielectric substrate. Each metal patch comprises an input-output port microstrip line, a first resonant chamber with a fractal defected structured quarter-mode substrate integrated waveguide, a second resonant chamber and a third resonant chamber. The first resonant chamber and the third resonant chamber are in mirror symmetry relative to the central axis of the second resonant chamber. A first electric coupling is arranged between the first resonant chamber and the second resonant chamber. A second electric coupling is arranged between the second resonant chamber and the third resonant chamber. Magnetic coupling between the first resonant chamber and the third resonant chamber is realized through an inductive window. The fractal defected structured quarter-mode substrate integrated waveguide bandpass filter has beneficial effects of compact structure, small dimension, high upper stopband selectivity, high performance stability and easy system integration.

The invention provides a low-intermodulation compatible type connection radio frequency socket and plug. The socket comprises an outer socket conductor, an inner jack conductor, a socket insulating support, an end face reed and a radial reed. The outer socket conductor is internally provided with an annular groove matched with and coupled to an outer plug conductor. The inner side of the annular groove is the front-segment tongue diameter, and the end face of the annular groove is a mechanical benchmark face. The front-segment tongue diameter and the mechanical benchmark face are designed to be of an integrated structure. The inner plug conductor in the plug is internally provided with an annular groove matched with and coupled to the outer socket conductor and an unlocking sleeve. The inner side of the annular groove is matched with the outer side of a socket-shaped groove in the radial direction, the satisfactory axial matching length is set, and the bottom of the annular groove is the mechanical benchmark face. According to the low-intermodulation compatible type connection radio frequency socket and plug, improvement is conducted on the mechanical benchmark face and electrical benchmark face separating design and contact outer conductor slotting design in the prior art, continuity of full-spectrum characteristic impedance and electric connectivity of a contact port are guaranteed, intermodulation interference and reflection coefficients are further lowered, and wider working bands and excellent return losses are achieved.

The invention discloses a device for converting a rectangular waveguide into a substrate integrated waveguide at the Ka wave band, belongs to the technical field of microwave millimeter wave integration, and particularly relates to a novel small transition structure for converting the rectangular waveguide into the substrate integrated waveguide at the Ka wave band. The device comprises the WR-28 rectangular waveguide, a transition structure and the substrate integrated waveguide (SIW). The transition structure comprises a dielectric substrate and flaky probes located on the upper layer and the lower layer of the dielectric substrate respectively, and the probes on the upper layer and the lower layer are bent conical flaky probes bent towards two sides. Thus, the device for converting the rectangular waveguide into the substrate integrated waveguide at the Ka wave band has the advantages that the return loss is better than 15 dB, the insertion loss is smaller than 1.4 dB, the work bandwidth is 24-40 GHz, the test result is similar to a simulation result, the circuit size is largely reduced and is only 3.6 mm long, and machining is quite convenient.

The invention discloses a frequency scanning CTS flat panel array antenna, includes a radiation layer and a broadband line source layer arranged in order from top to bottom, the radiation layer includes a first radiation element and a second radiation element, a first radiating element is located above the second radiating element, the first radiation unit includes a first metal plate and 17 continuous transverse branches disposed on the first metal plate, the first metal plate is a rectangular plate, 17 consecutive transverse branch are uniformly spaced from left to right on that first metalplate. The second radiating unit comprises a second metal plate on which a non-uniform slow wave structure, a sixth rectangular waveguide cavity and a seventh rectangular waveguide cavity are sequentially arranged from left to right, and a broadband line source layer comprises a third metal plate, a single ridge waveguide feeding network and a single ridge waveguide. The second radiating unit comprises a second metal plate, wherein the second metal plate is provided with a non-uniform slow wave structure, a sixth rectangular waveguide cavity and a seventh rectangular waveguide cavity from leftto right Rectangular waveguide converter and quasi-TEM mode line source generator. The invention has the advantages of small size, high gain and high efficiency.

The invention discloses an improved waveguide probe transition based structure for performing modular packaging for a chip. The improved waveguide probe transition based structure comprises a metal cavity; more than one waveguide cavity and more than one transition probe are arranged in the metal cavity; one end of each transition probe is positioned in the waveguide cavity while the other end of the transition probe is provided with the chip needing to be packaged; the chip is connected with the corresponding transition probe through a bonding gold thread, and conductive adhesive or/and a metal lug boss is arranged in the junction between the chip and the transition probe. The improved waveguide probe transition based structure is low in return loss, so that the energy reflection between a packaging module and the chip is effectively reduced.

The invention discloses a novel waveguide polarizer, which comprises a square waveguide (1), a metal partition plate (2) and two waveguide gradient parts (6 and 7), wherein the metal partition plate (2) comprises a receiving unit (3), a transmission unit (4) and a radiation unit (5) which are sequentially connected; the width of the metal partition plate (2) is equal to the length of the inner side of the square waveguide (1); the metal partition plate (2) is arranged at the axisymmetric position of the square waveguide (1); one end of the metal partition plate (2) is in contact with a square public port at one end of the square waveguide (1) and divides the square public port into two rectangular ports; the two waveguide gradient parts (6 and 7) are connected with the two rectangular ports respectively; two orthogonal wave beams received by the square waveguide (1) are converted by the metal partition plate (2); and a left-handed or right-handed circularly polarized signal is achieved by a phase difference generated between the received and converted wave beams. By the novel waveguide polarizer, good properties of the return loss, the insertion loss and the phase difference can be obtained.

The invention discloses a linear polarization single pulse planar slot antenna, and belongs to the antenna technical field; the antenna comprises a radiation slot feed layer and a single pulse feed network; the surface of a single layer radial line waveguide is provided with a radiation slot array; each ring of the radiation slot array is to arrange one slot to encircle the radial line waveguide center in one quadrant waveguide according to conventional linear polarization RLSA slot arrangement rules, and enables one slot to be symmetrical in up-down and left-right direction so as to obtain slots in four quadrant waveguides of the same ring, thus controlling the feed network to change feed phases, and realizing linear polarization and single pulse. The feed structure is simple in structure, can prevent a massive feed network structure, is small in loss, and high in antenna efficiency. Compared with a conventional linear polarization RLSA structure, the antenna can realize linear polarization and single pulse in the same time, and employs single slot to be a linear polarization radiation unit so as to improve the refection coefficient; the linear polarization single pulse planar slot antenna has a stable radiation pattern in a work frequency band, has an extreme low cross polarization level, and has an excellent return loss.