31 results about "Wideband balun" patented technology

An RF transmitter capable of transmitting over a wide range of frequencies includes a mixer, a wideband high-Q balun, a first driver amplifier and a second driver amplifier. The balun has a single primary winding and two secondary windings. A differential output of the mixer is coupled to the primary winding. A first of the two secondary windings is coupled to drive the first driver amplifier. A second of the two secondary windings is coupled to drive the second driver amplifier. One driver amplifier is used when transmitting at lower frequencies whereas the other driver amplifier is used when transmitting at higher frequencies. By appropriate sizing of the inductances of the secondary windings and by switching out one of the secondary windings at certain times, the balun is tunable to operate over the wide frequency range while having a high quality factor Q, thereby facilitating reduced power consumption while simultaneously meeting performance requirements.

The invention discloses a broadband low-profile circularly polarized antenna based on asymmetric dipoles. The antenna has a four-layer structure, wherein the first layer is a radiation structure whichis printed on the upper layer of an upper dielectric plate and has a rotational symmetry characteristic, and comprises four asymmetric dipoles, each dipole comprising a long arm on the outer side anda short arm on the inner side; the second layer is of an artificial magnetic conductor structure and comprises two kinds of different sizes of square metal patches which are printed on the upper layer of a middle dielectric plate; the third layer is a floor printed on the upper layer of a lower dielectric plate and a feed network printed on the lower layer of the lower dielectric plate, and comprises a second-order Wilkinson power divider and a 90-degree broadband phase shifter; and the fourth layer is four broadband balun structures printed on a vertical dielectric plate, provides balance feed for the radiation structure, and realizes impedance matching in a broadband. The antenna has the advantages of wide frequency band, low profile, simple structure, gentle in-band gain and the like,and is suitable for the wireless communication fields of electronic countermeasure, radio frequency identification systems, wireless local area networks, global positioning systems and the like.

A miniature wideband balun is realized wherein a miniature rectangular high permeability ferrite binocular core is wound with a single wire on the first of three legs and a twisted pair of wires on the third of three legs. Each winding is configured from 36 gauge wire to include two turns with precise positioning and spacing on the legs, and precise control over the length and position of the non-wound wire portions. The non-wound wire portions have their ends welded to the conductive terminals of a flat insulating substrate which the core is bonded to. Such an approach results in a wideband response of from 10 MHz to at least 6000 MHz with a substantially flat insertion loss and a low return loss. Additionally, a lid is bonded to the top of the core in order to form a package conducive to handling by standard pick and place robotic assembly machinery.

The invention discloses a multiport high-isolation-degree balance power dividing network based on broadside coupling. The multiport high-isolation-degree balance power dividing network comprises an upper-layer structure and a lower-layer structure, wherein the upper-layer structure forms a six-port balance power distributing network through parallel connection of two-stage broadband Baluns, transmission of broadband different-mode signals is achieved through four pairs of short-circuited coupling lines, the isolation degree of different-mode signal power dividing can be effectively improved through two isolation resistors connected at the output ends of the Baluns in parallel, multiple open-circuited branch lines loaded on an upper-layer metal layer can produce multiple transmission zero points, the inhibition degree of common-mode signals is effectively improved, the coupling degree of the short-circuited coupling lines can be effectively improved through four metal sheets on the lower layer, and power dividing bandwidth of the coupling lines in the upper-layer metal layer is increased. The different-mode signal bandwidth in a balance circuit can be improved to be higher than 50% by means of a whole balance circuit structure, and the multiport high-isolation-degree balance power dividing network is simple in structural design, small in size and good in electrical performance and is easily integrated with other plane microwave millimeter wave circuits.

The invention belongs to the technical field of microwave antennas, and solves the problem that the broadband impedance bandwidth of the traditional antenna array cannot be realized. The invention provides an antenna array which comprises at least two antenna elements in the same row or column, and the distance between each two adjacent antenna elements is 5 to 50 mm, the antenna unit is used to widen the frequency band of the antenna array to 0.4 to 40GHz. The coupling introduced by the close arrangement of antenna elements can cancel out the low-frequency reactance introduced by the floor torealize the wideband antenna array operation, The invention can realize the wideband balun feed through the gradual change microstrip line, and can restrain the reflection of the metal floor to the electromagnetic wave of the specific frequency band through the resistance structure. At that same time, the invention also has the advantage of small volume, light weight, controllable cost, integrative printing processs and the like, and can be applied to various wideband antenna systems in large quantities. T

The invention provides a circularly polarized antenna. The circularly polarized antenna comprises a dielectric cylinder, a feed substrate, a feed network and a plurality of radiation oscillators; thefeed network is arranged on the front surface and the back surface of the feed substrate; the feed substrate is fixed in the dielectric cylinder; the plurality of radiation oscillators are spirally arranged on the outer surface of the dielectric cylinder, and one end of each radiation oscillator is electrically connected with the feed network; the feed network comprises a feed port and a pluralityof folded broadband baluns, one end of each broadband balun is electrically connected with one radiation oscillator, and the other end of each broadband balun is connected with the feed port. According to the invention, the circularly polarized antenna with a simple structure is designed and obtained, and the broadband balun is folded, so that the radial size of the circularly polarized antenna can be reduced, and the circularly polarized antenna with a relatively small size is obtained.

The invention provides a patch-loaded broadband dual-polarized base station antenna. The patch-loaded broadband dual-polarized base station antenna comprises a first broadband balun structure, a second broadband balun structure, a metal patch and a reflecting plate. The first broadband balun structure and the second broadband balun structure are connected with the reflecting plate; the first broadband balun structure and the second broadband balun structure are perpendicular to the reflecting plate and are orthogonal to each other; and the metal patch is arranged above the first broadband balun structure and the second broadband balun structure. According to the invention, a novel resonance mode can be introduced through balun structure coupling excitation, so that the bandwidth of the antenna is expanded; the feed structure and the radiation unit are integrally designed, and the antenna bandwidth is expanded by loading patches, so that the design of the antenna can be simplified; while a wide working band is realized, the antenna has the characteristics of high gain, high isolation and low cross polarization, and can realize stable radiation pattern characteristics.

The invention provides a dual circularly polarized patch array antenna based on broadband balun feed. The dual circularly polarized patch array antenna comprises a first dielectric substrate, a seconddielectric substrate and a third dielectric substrate which are stacked from top to bottom. An antenna array composed of a plurality of antenna units is arranged on the upper surface of the first dielectric substrate. An annular feed network is arranged on the upper surface of the second dielectric substrate. A first microstrip balun and a second microstrip balun are arranged on the lower surfaceof the third dielectric substrate. The two feed points of the first microstrip balun are respectively connected with the annular feed network through two coaxial probes. The two feed points of the second microstrip balun are respectively connected with the annular feed network through the remaining two coaxial probes. The multi-feed-point excitation method is utilized to realize the dual circularpolarization characteristic of the antenna array, and the introduced annular feed network is used as a medium to realize weak coupling so that the complexity of antenna design is reduced and the 3dBaxis ratio bandwidth of the antenna is greatly improved.

A Guanella type balun with a conductive enclosure (for example, a re-entrant box) between its coupled lines and the magnetic material enclosing its coupled lines. Some embodiments use coupled strip lines. Some embodiments have dielectric material, such as printed circuit board material inside the re-entrant box along with the coupled strip lines. Preferably, the magnetic material is ferrimagnetic. Some preferred magnetic materials are non-conductive.

The invention provides an ultra-wideband high-stability IQ modulator circuit. A carrier signal is firstly input through an IN port, and is divided into two paths of signals after being processed by aninput amplifier unit, wherein one path of signals pass through an R-C network of a channel 1, and the other path of signals pass through a C-R network of a channel 2, and thus the carrier signal is divided into two paths of signals which have a phase difference of 90 degrees at a 90-degree phase shifter consisting of the R-C network and the C-R network, and the signals of the channel 1 and the channel 2 are separately amplified through a channel amplifier unit, are separately mixed with a baseband signal I and a baseband signal Q at a mixing unit, are amplified through an output amplifier unit, and then are combined through an output wideband balun to output an IQ modulation signal. According to the scheme of the invention, the wideband 90-degree phase shifter implemented by the R-C network and the C-R network is small in circuit size and can be integrated on a monolithic integrated circuit; and vector modulation errors can be reduced, and the quality of vector modulation signals canbe improved.

The invention discloses a wideband balun based on a microstrip line-slot structure. The wideband balun comprises an input end microstrip line conduction band and two output end microstrip line conduction bands, which are arranged on the upper surface of a dielectric substrate, wherein two sections of U-shaped slot lines and a metal ground plate are arranged on the lower surface of the dielectric substrate; the input end microstrip line conduction band and the middle portions of the two sections of U-shaped slot lines form a vertical three-dimensional cross structure, and the input end microstrip line conduction band is parallel to internal slot lines; the two output end microstrip line conduction bands are respectively arranged on two sides of the input end microstrip line conduction band, extend from the edge of the dielectric substrate to the input end microstrip line conduction band and have tail ends folded to be L-shaped; the folded portions of the two output end microstrip line conduction bands are parallel to the external slot lines of the U-shaped slot lines, and the output end microstrip line conduction bands on the two sides are distributed in central symmetry about the midpoint of the input end microstrip line conduction band. The wideband balun has the advantages of compact structure, low insertion loss, good matching characteristic and the like, and facilitates broadband and miniaturization development of wireless communication.

The invention discloses a low-profile broadband wide-angle scanning tight coupling antenna unit and array. The antenna unit comprises a V-shaped split ring, a medium matching layer, an antenna radiation patch , an ultra-wideband balun and a reflection floor, wherein the V-shaped split ring is formed by enclosing two subunits, and the two subunits are spaced to form an opening; the medium matching layer is positioned below the split ring and is used for arranging the split ring; the antenna radiation patch comprises a first radiation arm and a second radiation arm, and the upper ends of the first radiation arm and the second radiation arm are electrically connected with the two subunits; the ultra-wideband balun comprises a signal input end and an ultra-wideband balun coupling end; the coupling end of the ultra-wideband balun is electrically connected with the lower ends of the first radiation arm and the second radiation arm; and the reflection floor is arranged below the dielectric substrate. According to the tightly coupled antenna designed by the invention, by loading the V-shaped split ring and the dielectric matching layer structure, E-plane +/-60-degree beam scanning can be realized within a frequency band of 6-18 GHz, and meanwhile, the profile height is only 0.069 lambdal.

A balun is a device for coupling together balanced and unbalanced electrical signals. An ultra-wide bandwidth balun can operate in a frequency band of more than 1.5 GHz to 26.5 GHz. The balun can be based upon a resistively loaded choke structure. The loading can be in the form of resistive cards or vanes. The vanes may be aligned with the electric field between the choke and an outer ground to prevent effective short circuits at points where the choke is half wavelength multiples in length. The resistive loading may also suppress higher order modes within the choke structure. The wideband balun can be very small to satisfy the tight space constraints of many modern communication applications. The balun may be fabricated using standard printed circuit board manufacturing techniques which may dramatically reduce production costs.

The invention discloses a miniaturized low-insertion-loss broadband balun based on an IPD. An unbalanced signal is fed into the first microstrip coupling line through the input port P1, and a radio frequency signal is coupled to the second microstrip coupling line and the third microstrip coupling line through the first microstrip coupling line. As the signals are transmitted by half wavelength more than the output port P3 from the input to the output port P2, the output signals of the signals are equal in amplitude and opposite in phase. Therefore, a 180-degree phase difference is realized between the output ports, and an unbalanced signal is converted into a balanced signal. According to the invention, on the basis of a traditional Marchand balun, coupling is enhanced by adopting a spiral cross coupling structure, and the working bandwidth of the balun is improved. On the other hand, the micro-strip balun is miniaturized through the IPD process design, and low insertion loss and good balance of output signals are achieved through optimization.

The invention discloses a broadband balun structure with a phase adjustment function. The whole structure can be a two-layer or three-layer printed circuit board structure, the bottom layer is a printed metal floor, the middle layer is a dielectric substrate, and the upper layer is a printed microstrip line radiation structure, a loading varactor, a capacitor and an inductor. The radiation structure is a gradient microstrip line or a folding microstrip line. The antenna is fed by a coaxial line, and joint welding and feeding are performed on the side surfaces of the two ends of the dielectricplate. Double varactors are loaded between the radiation microstrip line and the ground, and the capacitance value of the varactors is adjusted by controlling the voltage, so that the phase shift function of the broadband balun is realized.

The invention relates to a numerical control 0-pi phase shifter, which comprises a high-power broadband balun and a diode bridge. The high-power broadband balun is provided with two branches, the P1 end and the P4 end of the diode bridge are connected to the two branches, and the P1 end or the P4 end is further connected with a control voltage end. The radio frequency input end is connected to the other end of the high-power broadband balun; and the P3 end of the diode bridge is connected with the radio frequency output end through the first capacitor, and the P2 end is grounded to realize single-ended radio frequency output. The phase shifter has the advantages that the control voltage can be lower than the signal amplitude, the PIN diode has good linearity, the distortion of the diode attenuator is small, the clutter harmonic is low, the phase inversion precision is good, the power capacity can reach more than 10W, the single-ended output can be realized, the balanced output can also be realized, and the cascade connection is convenient.

A balun structure is disclosed having positive and negative going signal paths coupled to a ninety degree hybrid. The positive signal path has a circuit trace and a phase shaper structure that provides three hundred and sixty degrees of phase shift at Port 1 of the hybrid. The negative going signal path has a circuit trace and a second order phase shaper that provides four hundred and fifty degrees of phase shift at Port 2 of the hybrid. Port 1 is coupled to Port 3 of the hybrid and functions as an output port. The first order phase shaper and the second order phase shaper compensate for the signal loss caused by a signal cable coupled to the output port and provide a frequency band from DC to at least 15 GHz and a transient response having less than ten percent pre-shoot.

The invention relates to a broadband omnidirectional circularly polarized antenna, and relates to the technical field of antennas. The antenna is composed of a feed part, a radiation part and a structure supporting part. The feed part comprises a feed network, a power divider, a broadband balun, a probe and a radio frequency connector; the radiation part comprises a horizontal radiation oscillator and a vertical radiation oscillator; the structure supporting part comprises a supporting column and a bottom plate. A plurality of groups of horizontal radiation oscillators and vertical radiation oscillators are adopted, so that horizontal omnidirectional circular polarization can be realized; the horizontal radiation oscillator has horizontal omnidirectional radiation performance, and an electric field is horizontally polarized; the vertical radiation oscillator has horizontal omnidirectional radiation performance, and an electric field is vertically polarized; and the two are shared to form horizontal omnidirectional radiation performance, and polarization is circular polarization. By changing the positions of the upper and lower metal bar-shaped structures of each group of vertical radiation oscillators, the left-handed/right-handed circular polarization characteristics can be flexibly switched. Meanwhile, a plurality of groups of horizontal radiation oscillators and vertical radiation oscillators are combined, so that the out-of-roundness of a directional diagram of the antenna can be improved.

The invention discloses a broadband circularly polarized patch antenna loaded with a metal sheet, including a circular radiation patch, two feeding probes, a metal loading sheet, a metal floor and a broadband balun, all of which are printed The circuit board technology is printed on the dielectric substrate; among them, the feeding probe is an L-shaped feeding probe, which is printed on one side of the dielectric substrate; the metal loading sheet is printed on both sides of the dielectric substrate. Through the broadband balun, the input signal is divided into two equal-amplitude orthogonal signals, and the energy is respectively fed into two L-shaped probes by means of the metal vias opened on the substrate; the adjustment placed between the two feeding probes The size and position of the metal loading piece can greatly broaden the axial ratio bandwidth of the antenna. The present invention aims at the characteristics of the standing wave and the narrow bandwidth of the axial ratio of the ordinary patch antenna, and realizes a circularly polarized antenna with a wide standing wave bandwidth and a wide axial ratio by using the printed circuit technology. The antenna can be easily integrated with the active circuit, adapting to Meet the communication requirements of L-band and S-band.

The invention discloses a solid plasma-based wideband variable-frequency antenna. The solid plasma-based wideband variable-frequency antenna comprises a solid plasma generator array (1), a substrate (2), biasing electrodes (3), a strut (4), a metal base (5), a wideband Balun (6) and a radio frequency connector (7), wherein the substrate (2) covers an upper port of the strut (4), the solid plasma generator array (1) is arranged on an upper surface of the substrate (2), a plurality of biasing electrodes (3) are connected to a part below the solid plasma generator array (1), the wideband Balun (6) is arranged in a cavity of the strut (4), an upper end of the wideband Balun (6) penetrates through the substrate (2) and is welded on the solid plasma generator array (1), and a lower end of the wideband Balun (6) is welded with the radio frequency connector (7) fixed at a part below the metal base (5). By the method, application in a frequency hopping radar and a frequency hopping communication system can be achieved.