79results about How to "Good broadband characteristics" patented technology

Disclosed herein is a broadband internal antenna. The broadband internal antenna includes a first radiator and a second radiator. The first radiator has a radiation part in which one or more coils having different pitch intervals are connected in series to each other. The second radiator has at least one conductive strip line arranged parallel to the longitudinal direction of the first radiator. Current flowing thorough the first radiator and current flowing through the strip lines form current paths in different directions, so that a certain broadband can be set using mutual Electromagnetic (EM) coupling.

The invention provides a ship radiation noise source distinguishing method based on a super directivity small-bore cylindrical array so as to realize ship radiation noise source distinguishing through the super directivity small-bore cylindrical array. All array elements of a measurement array are used for receiving correlation properties between ambient noise signals to design a super directivity weight vector so as to form a narrow beam width and high gain processing system; on the assumption of a six-lightspot target model, a ship radiation noise source distinguishing result based on the super directivity small-bore cylindrical array is obtained through computer simulation; a comparison simulation study with conventional beam forming proves the advantages of the ship radiation noise source distinguishing method based on the super directivity small-bore cylindrical array in terms of ship radiation noise source distinguishing.

The invention discloses a broadband anti-metal radio-frequency identification tag and a special mounting structure for a metal surface thereof. The front face of a tag substrate is provided with a tag patch antenna and a chip, the patch antenna comprises a first part and a second part, the first part and the second part are respectively and electrically connected with the chip through a first feed line and a second feed line, the vertical surfaces at two ends of the tag substrate are respectively and symmetrically provided with a first short circuit wall and a second short circuit wall, and a first coupling line unit and a second coupling line unit are symmetrically arranged near the two ends of the first feed line and the second feed line, so that a capacitive coupling structure is formed between the antenna body and a coupling antenna unit. In the special mounting structure for the metal surface, a depressed structural space for accommodating the tag is formed on the metal surface, and the tag is fixedly arranged in the depressed structural space of the metal surface. While the wave absorbing material needs not to be increased additionally, the reading and writing performance like adhesion to the surface of an ordinary object can be realized. Moreover, the radio-frequency identification tag has large bandwidth and a small size.

The invention provides a measuring method for the stray capacitance of a large-capacity high-frequency transformer. The method includes the steps that 1, a frequency-variable excitation signal is exerted on the high-frequency transformer through a signal generator, and an oscilloscope collects a voltage signal and a current signal of a primary-side winding of the high-frequency transformer; 2, the natural resonant frequency of the high-frequency transformer is acquired according to Lissajous figures, displayed by the oscilloscope, of the voltage signal and the current signal; 3, the magnetic inductance Lm of the primary-side winding of the high-frequency transformer and the leakage inductance Ls of a secondary-side winding of the high-frequency transformer are calculated; 4, the stray capacitance of the high-frequency transformer is calculated. Compared with the prior art, no precision equipment such as an impedance analyzer and a network analyzer is needed, the stray capacitance of the large-capacity high-frequency transformer can be conveniently and effectively extracted through simple voltage and current measurement, and research on the stray parameter effect of the large-capacity high-frequency transformer and improvement on the broadband frequency characteristics of the large-capacity high-frequency transformer are facilitated.

The invention relates to the field of RFID (radio-frequency identification) electronic tags, in particular to an impedance-adjustable broadband tag antenna applied to UHF (ultrahigh frequency). The tag structure has the advantages of UHF RFID function, tunable impedance, dual-frequency resonance, high gain and the like and comprises an antenna radiation body 1, a dielectric board 2 and a target chip 3. The antenna radiation body 1 comprises two dipoles close to each other and an n-type matching network. The chip with impedance varying from (5-j50) to (80-j400) is matched by regulating the height and width of the n-type matching network, so that the antenna radiation body is fine in conjugated matching in the range of UHF in China.

The invention provides an ultra-wideband MIMO antenna. The ultra-wideband MIMO antenna comprises four antenna array elements with the same structure, and each array element is fed separately; positions of adjacent array elements are mutually vertical and are isolated through a rectangular slot, and the tail ends of the rectangular slots are electrically connected at the center position of the MIMOantenna; each antenna array element comprises a grounding plate, a feeding unit and a parasitic patch which are printed on the surface of an antenna dielectric plate respectively; an elliptical areais also cut off on the grounding plate; the feeding unit uses elliptical and rectangular areas and digs out an elliptical area as feeding parts of the antenna; and due to the coupling effects in the above mode, on one hand, high isolation is acquired among unit, and on the other hand, while the antenna acquires the ultra-wideband characteristic, the antenna has the advantages of miniaturization and compact structure and the like.

The invention is concerned with the broadband double-decked rectangle micro-band sticking- chip antenna of non-radiation side feed. The characteristic is: the length ratio of the radiating side and the non-radiating side of the rectangular spurious element and the rectangular feed element is 1.1~1.6; the rectangular spurious element is with more than one narrow slits that is vertical with the radiating side; the feed point is located at the non-radiating side of the feed element and departures from the midpoint of the non-radiating side. The invention is with good broadband characteristic, can get the standing-wave ratio better than 1.3 in the corresponding 8~16.5% broadband, the crossing cross polarization electrical level is better than -18.5dB, the magnification is bigger than 8.3dB. The invention not only can only use the antenna of the electronic equipment, but also can be the antenna unit of the micro-band array antenna.

The invention discloses an impedance matching unit, a system and a method used for calibrating a high-frequency current sensor. The impedance matching unit is a transmission line structure formed by a radio frequency coaxial line with the characteristic impedance being 50ohm. The high-frequency current sensor is installed at a central position inside the impedance matching unit. The transmission line structure comprises a radio frequency coaxial input end, a radio frequency coaxial output end and a shell, wherein a core wire inside the transmission line structure penetrates through the radio frequency coaxial input end and the radio frequency coaxial output end; and the shell transits towards the middle from the radio frequency coaxial input end and the radio frequency coaxial output end so as to form a conical transition structure. The impedance matching unit disclosed by the invention solves a technical problem in relevant technologies that broadband characteristics of the high-frequency current sensor cannot be authentically reflected due to a calibration result of a high-frequency current sensor performance detection method in a high frequency interval has great distortion because of deficient impedance matching and bandwidth and the like.

The invention discloses a broadband horn array antenna, and especially relates to a high-efficiency antenna array which can effectively improve the bandwidth of a horn antenna and has a simple ridgedhorn structure. The array antenna is structurally composed of a plurality of horn antennas, wherein the internal part of a resonant cavity of each horn antenna is provided with a single ridge piece part, each single ridge piece part extends upwards from the bottom of the corresponding resonant cavity, the lower edge of a radiation port of each horn antenna is located above the corresponding singleridge piece part, a coupling slot used for coupling signals is reserved between the bottom of each single ridge piece part and the corresponding resonant cavity, the bottom of each horn antenna is connected with a strip line, each strip line extends into the coupling slot of the corresponding horn antenna, and the strip lines are synthesized through a broadband power divider to form an output signal. The broadband horn array antenna adopts the combination of the traditional horn array and ridge waveguide broadband feed, and achieves a purpose of high efficiency of a broadband antenna. Compared with the traditional horn array, the bandwidth is greatly improved; and compared with the general ridged horn antenna, the efficiency is high.

The invention belongs to the technical field of active phased array radar and antennas. In order to solve the problems that the existing blind spot suppression techniques cannot suppress the scanningblind spots in a wide frequency range and the design difficulty increases due to the introduction of additional structures, the present invention provides a microstrip antenna unit comprising a dielectric plate and a feeding structure arranged on the dielectric plate, the feeding structure being used for suppressing scanning blind spots of the microstrip antenna array. By vertically arranging thesecond feeding structure in the dielectric plate, the surface wave of the microstrip antenna element can be effectively suppressed, thereby eliminating the scanning blind spots of the microstrip antenna array in a wide scanning range.

Provided is a ladder SAW filter in which surface acoustic waves are propagated in an isotropic manner, which has no occurrence of different propagation speeds of the surface acoustic waves caused by an arrangement direction of an IDT, and which has almost no deterioration of the broadband characteristics. A piezoelectric layer 3 is formed by gathering a large number of crystal grains in an isotropic shape in a plan view on a substrate 2. A plurality of comb-shaped electrodes 4 having one array direction respectively on the piezoelectric layer 3. The ladder SAW filter 1 is doped in which at least one array direction of the comb-shaped electrode 4a among the comb-shaped electrodes is different from the array directions of the other comb-shaped electrodes 4b, 4c.

The invention discloses a broadband circularly-polarized antenna. The antenna comprises an upper-layer dielectric plate and a lower-layer dielectric plate, wherein the upper-layer dielectric plate andthe lower-layer dielectric plate are connected through four metal columns, the lower surface of the upper-layer dielectric plate comprises four strip feeders, and the upper surface of the upper-layerdielectric plate comprises an annular patch; and a feed port is arranged at one end of each strip feeder, the four feed ports feed the four strip feeders through the four metal columns respectively,the four strip feeders couple electromagnetic wave energy to the annular patch, and the annular patch radiates the electromagnetic wave energy. According to the broadband circularly-polarized antenna,coupling feeding is performed on the annular patch of the antenna through the four strip feeders, impedance bandwidth and axial ratio bandwidth of the circularly-polarized antenna are increased, andthe circularly-polarized antenna has good broadband characteristics and circular polarization characteristics.

A millimeter wave band power amplifier based on flexible chip integrated wave guide technology can be used as a technical proposal for a final power amplifier of a transmitter in a millimeter wave system. The basic constitutive unit of the power amplifier is a pair of thin chip integrated wave guides containing a symmetrical wedge transition structure. The symmetrical wedges on the unit are respectively inserted into the corresponding input and output rectangular metal wave guide along the wave guide thin wall so that the power distribution and power synthesization in the wave guides with broadband and high efficiency can be realized. Meanwhile, as signal FSIW is led out of the wave guide to be amplified, the mounting, debugging and radiating of the amplifier are facilitated. The invention also realizes a Ka waveband synthesizing broadband power amplifier, of which the maximum output power at the 26.5GHz is about 4.2W (continuous wave), the maximum synthetic efficiency at the 26.4GHz is about 72.5%, and the synthetic efficiency between 25.1GHz and 28.4GHz is over 60%.

The invention discloses a dual stop band ultra-wideband antenna with a steep stop band, and the antenna comprises a dielectric substrate, a radiating element, a micro-strip feeder, a back metal patch, a metal ground plate and a via hole. Double L-shaped grooves are arranged on the radiating element, a rectangular groove is arranged on the back metal patch, and a step-type structure is on the metal ground plate. The radiating element and the micro-strip feeder are arranged on the upper surface of the dielectric substrate and are connected with each other. The back metal patch and the metal ground plate are arranged on the lower surface of the dielectric substrate, and the via hole connects the radiating element with the back metal patch. According to the invention, the antenna has steep edges of stop band characteristic, two stop bands are generated in WiMAX and WLAN frequency bands, and a problem that the antenna interference between an ultra-wideband wireless communication system and WLAN and WiMAX systems can be effectively solved.

The invention discloses a Ku/Ka dual-frequency dual-polarization phased-array antenna radiation array, which comprises a plurality of basic units and a plurality of Ka antenna units. A Ku antenna unit is arranged in each basic unit; the Ku antenna units are dual-line polarized antennas and are arranged in a periodic array mode; the Ka antenna units are single-line polarized antennas and are arranged in a sparse array mode. And the Ka antenna units are arranged at the junctions of the adjacent basic units, and/or the Ka antenna units are arranged at the edges of the outer sides of the antenna radiation arrays. According to the invention, the radiation array of the phased-array antenna is a combination of the Ku periodic array and the Ka sparse array, the radiativity of the Ku frequency band and the Ka frequency band does not influence each other, and meanwhile, after the Ka antenna units are sparse, the sidelobe characteristic is good.

The invention discloses a resistor loaded ultra wide band plane semi-elliptical antenna. A metallic shielding cavity is a rectangular low-reflection cavity with an opening in the front end; an insulated dielectric plate is fixed at the position of the opening in the front end of the metallic shielding cavity; semi-elliptical metal radiation arms are symmetrically printed on the front of the insulated dielectric plate; an interval is preset between the semi-elliptical metal radiation arms; input ports are formed in the two adjacent semi-elliptical metal radiation arms at an interval respectively as respective feed ends; loading resistors are symmetrically welded between the bottom edges of the semi-elliptical metal radiation arms and the side plate of the metallic shielding cavity; a feed unit is an FR4 dielectric plate carrying a commercial transmission line transformer; the balanced output end of the transmission line transformer is connected with the semi-elliptical metal radiation arms respectively; one end of a coaxial connector is welded with a micro-strip input end of the transmission line transformer, and the other end of the coaxial connector is connected with a transmitter and a receiver of a life detection radar system. The resistor loaded ultra wide band plane semi-elliptical antenna has good broadband characteristic and time domain radiation characteristic, and is compact in structure and simple in feeding mode.

The invention discloses a broadband planar reflective array antenna with a wider phase compensation range. The technical scheme adopted is as follows: the planar reflective array antenna includes a feed source and a conductive planar reflective array surface; the feed source is used for emitting or receiving electromagnetic waves; the conductive planar reflective array surface is used for scattering the electromagnetic waves emitted by the feed source into planar waves or receiving the planar waves and converging the planar waves onto the feed source; and a number of reflection units are distributed in an array on the conductive planar reflective array surface, and each reflection unit includes a phase hole and four branches distributed on the phase hole. The planar reflective array antenna is characterized in that twigs extend in the same direction from one side of the branches, the twigs extend near the edges of the phase holes, and slots for are formed between the twigs and the edges of the phase holes to adjust and control phase compensation and working frequency.

The invention belongs to the technical field of the electromagnetic wave-absorbing material, and specifically relates to the film-like CoFe2O4/graphene type wave-absorbing material and a preparation method and application thereof. The method comprises the following steps: dissolving the cobalt acetoacetate (Co(acac)2) and ferric acetoacetate (Fe(acac)3) into ethylene glycol to acquire solving liquid, and then loading the solving liquid on the graphene through organic thermal decomposition; and then acquiring the film-like CoFe2O4/graphene type wave-absorbing material through thermal treatment.The process disclosed by the invention is simple in process, short in preparation period, and large in yield. The film-like CoFe2O4/graphene absorbing solvent prepared through the method has good dielectric loss capacity and the broadband absorbing performance.