89results 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.

A distortion circuit is provided for correcting the distortion from a nonlinear circuit element by generating a frequency dependent signal having a sign opposite to the distortion signal produced by the nonlinear circuit and substantially the same magnitude. The distortion circuit includes an input signal and a first nonlinear device coupled to the input signal for generating a first signal and where the first nonlinear device has a first bias level. Also included is a second nonlinear device different from same first nonlinear device and coupled to the first nonlinear device for modifying the first signal to produce an output second signal, the second nonlinear device having a second bias level. A bias control means is provided for adjusting the first and said second bias levels so that the magnitude, phase and frequency of the output second signal can be adjusted.

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 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, 3.2-3.5 GHz and 4.9-6.8 GHz frequency band. Moreover, the antenna assembly comprises a radiating element and two parasitic branches, all of which are 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 L-shaped structure and the plastic housing make the antenna to be compact in size so it can be easily fabricated and employed in computers.

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.

Methods, systems, and apparatus are disclosed for high power thermal vacuum testing of satellite payloads using pick-up horns. Such pick-up horns can include at least one outer metal wall forming a metal body and at least one interior surface disposed in the metal body, forming at least one chamber in the metal body. The pick-up horn further includes a front metal surface disposed at a front end of the metal body, having at least one opening corresponding to the at least one chamber, and at least one high-power absorbing load disposed within the at least one chamber and in contact with the at least one interior surface. A pick-up horn may further include a serpentine coolant path disposed within the metal body between an outer surface of the at least one outer metal wall and the at least one high-power absorbing load. Related systems and methods are described.

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.

A surface-mounted multi-band LTE antenna that covers the frequency band of 698-960 MHz (LTE 700 / 800 / 900 bands) and 2400-2500 GHz (WLAN 2.4G band) is disclosed herein. The antenna preferably has high gain and high radiation efficiency, and is used for a variety of wireless communication devices applications. The surface-mounted multi-band LTE antenna has compact size, wide bandwidth, good return loss, high gain and high radiation efficiency, and no matching circuit is needed.

A distortion circuit is provided for correcting the distortion from a nonlinear circuit element by generating a frequency dependent signal having a sign opposite to the distortion signal produced by the nonlinear circuit and substantially the same magnitude. The distortion circuit includes an input signal and a first nonlinear device coupled to the input signal for generating a first signal and where the first nonlinear device has a first bias level. Also included is a second nonlinear device different from same first nonlinear device and coupled to the first nonlinear device for modifying the first signal to produce an output second signal, the second nonlinear device having a second bias level. A bias control means is provided for adjusting the first and said second bias levels so that the magnitude, phase and frequency of the output second signal can be adjusted.

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.

A phase shifter unit cell or a connected set of such cells that can be well isolated from external circuitry and which do not introduce insertion loss into an RF signal path, exhibit good return loss, and further provides additional advantages when combined with bracketing attenuator circuits. More particularly, embodiments integrate a high-isolation function within a phase shifter circuit by breaking the complimentary nature of the control signals to a phase shifter cell to provide greater control of switch states internal to the phase shifter cell and thus enable a distinct high-isolation state, and by including a switchable shunt termination resistor for use in the high-isolation state. Some embodiments are serially coupled to attenuator circuits to enable synergistic interaction that reduces overall die size and / or increases isolation. One such embodiment positions a high-isolation phase shifter cell in accordance with the present invention between bracketing programmable attenuators.

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.

A multi-state phase shifter circuit having both low insertion loss (IL) and good return loss. Two or more phase shift elements are combined into a single cell architecture to reduce the number of series-connected FET switches and reduce the total IL. One embodiment has two ports connected by parallel signal paths each comprising a pair of switches and a phase shift element comprising, for example, an inductor, a capacitor, a transmission line, or a conductor. Another embodiment has two ports connected by parallel signal paths each comprising a switch and at least one associated phase shift element. The switches in each parallel signal path allow the associated phase shift element to be placed in-circuit under the control of an applied signal. The sets of switches may be independently controlled, so that multiple parallel signal paths may be switched into circuit between the phase shifter circuit ports at the same time.

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 present invention discloses a high-isolation coaxial radial multipath power divider suitable for a millimeter wave frequency. The power divider comprises a coaxial line input port, three circulartruncated cone matching structures, a plurality of rectangular waveguide output ports (n>=2), isolation ports and isolation port matching structures. TEM waves in a coaxial line are combined to TE10 modes in rectangular waveguides through the circular truncated cone matching structures, mode conversion and energy distribution of the TEM waves in the coaxial line to the TE10 modes of the n rectangular waveguides is achieved through guidance of the isolation ports, and signals of each output port are equal in amplitude and in phase. Isolation ports are added to have a high isolation between theoutput ports, compared to structures such as a circular waveguide, the high-isolation coaxial radial power divider employs a coaxial line and employs main mode transmission of the coaxial line, the mode is pure to avoid interference of a higher mode, and the structure is especially suitable for a power distribution / synthesis circuit with a millimeter wave frequency and can be extended to a higherfrequency.

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.

Methods, systems, and apparatus are disclosed for high power thermal vacuum testing of satellite payloads using pick-up horns. Such pick-up horns can include at least one outer metal wall forming a metal body and at least one interior surface disposed in the metal body, forming at least one chamber in the metal body. The pick-up horn further includes a front metal surface disposed at a front end of the metal body, having at least one opening corresponding to the at least one chamber, and at least one high-power absorbing load disposed within the at least one chamber and in contact with the at least one interior surface. A pick-up horn may further include a serpentine coolant path disposed within the metal body between an outer surface of the at least one outer metal wall and the at least one high-power absorbing load. Related systems and methods are described.

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 an ultra wideband amplitude equalizer based on a defected ground structure. An input port, an input matching circuit, a main transmission line, an output matching circuit and an output port are orderly arranged from signal input to output, a DGS for loading the resistance is arranged on a metal ground layer under a dielectric substrate. The amplitude equalizer disclosed by the invention has the characteristics of ultra wideband, small size and simple structure, is easy for manufacturing and large-scale production, and worthy of popularizing in the industry.

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 novel surface-mounted topological structure, in particular, a multi-stub loading multi-mode resonator-based small-sized passband controllable low-loss four-band micro-strip bandpass filter and belongs to the microwave communication field. The filter is formed by means of the coupling of a second-order multi-stub loading four-mode resonator, so that the filter can be of asymmetrical structure, and therefore, the compactness of the structure of the filter can be ensured. The resonator of the filter has four individually controllable resonance modes, which results in the independent controllability of the center frequency of the filter, and therefore, the bandwidth of the filter can be controlled through adjusting the coupling coefficient of the two resonators, andthe passband controllability of the filter can be ensured. A two-port single-finger end-coupling structure network is adopted to design the filter; the two-port single-finger end-coupling structure network is provided with two feeder lines; a signal input port and a signal output port are respectively arranged at the left and right side of the topological structure; and therefore, low loss can beensured. A cascaded coupling structure is adopted to realize four-pass bands, so that the practicality of the filter can be ensured.

The invention provides an adjustable antenna. The adjustable antenna comprises an antenna, a matching inductor and a phase shifter, wherein the input end of the phase shifter is connected with the antenna and inputs a microwave signal received by the antenna, the output end of the phase shifter outputs the microwave signal after conversion, and the matching inductor is connected between the input end of the phase shifter and ground. By the adjustable antenna, the radiation efficiency of the antenna is improved better, a wide adjustable range can be acquired, continuous adjustment can be achieved, and the adjustable antenna is flexible and convenient. Moreover, if the characteristic impedance of the phase shifter is changed, the adjustment range can be changed, different antennas can be matched, and return loss can be amplified.

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.