37results about How to "Expand low frequency bandwidth" patented technology

Low-frequency bandwidth extension in the form of dynamic electrical equalization may be applied to loudspeakers so long as the excursion capability of their drive units as well as velocity limits of any port(s) or excursion limits of any associated passive radiator(s), and the power limits of the drive units are not exceeded. The bandwidth extension maximizes low-frequency bandwidth dynamically such that excursion is fully utilized over a range of drive levels, without exceeding the excursion limit. Additional limiting control is available for port air velocity or passive radiator excursion, and loudspeaker drive unit electrical power. The system applies to open back, closed box, vented box, and more complex box constructions consisting of combinations of these elements for loudspeaker designs using design parameters appropriate to each system.

A 4G antenna with a metal frame comprises the metal frame, a PCB and an antenna part. The PCB comprises a clearance area and a metal area, the antenna part is located in the clearance area, and comprises a feed supply, a grounding point and a line part, the grounding point and the feed supply are arranged on the PCB, the grounding point is connected with the metal area, a feed line is led out of the feed supply, and the feed supply horizontally extends from the end, close to the metal frame, of the feed line to form a high-frequency line and a low-frequency line which are opposite in direction. First low-frequency resonance is generated by a first low-frequency branch, a second low-frequency branch and a second frame body. First high-frequency resonance is generated by the first low-frequency branch, the second low-frequency branch and a first frame body radiation loop. A first high-frequency branch and the second frame body are coupled to generate second high-frequency resonance. A parasitic branch is used for generating third high-frequency resonance. The method that the front part of the low-frequency line is bent in the reverse height direction is utilized, and the low-frequency bandwidth of the antenna is expanded. Each high-frequency resonance is generated by the radiation of the metal frame, and the problem that the metal frame shields high-frequency antenna radiation is solved.

The invention discloses an electronic device. The electronic device comprises a metal shell and at least one switch, the metal shell comprises a peripheral frame which is provided with at least one hair crack belt, the hair crack belts divide the peripheral frame into at least one section of a frame body, each hair crack belt is formed by at least two hair cracks arranged at intervals, a metal part is arranged between the two adjacent hair cracks, each switch comprises a first end and a second end, each first end is electrically connected to the corresponding frame body divided by the corresponding hair crack belt, each second end is electrically connected to the corresponding metal part, and each frame body divided by the corresponding hair crack belt serves as a separate antenna. By means of the electronic device, low-frequency broadband of an electronic device antenna can be expanded, and the freedom degree of antenna performance adjustment is increased.

The invention discloses a tightly-coupled ultra-wideband low-profile conformal phased array based on resistance ring loading and a development method thereof. A method for enhancing capacitive coupling is provided, a traditional cross-shaped dipole is improved, a resistive frequency selection surface composed of a micro-strip line and a lumped resistor is loaded between an antenna radiation patch and a floor, and the working bandwidth of the antenna is expanded. A feed structure of a power divider and double-balun is applied, so that better matching can be realized, and the profile height of the antenna is reduced. The whole antenna array is subjected to conformal processing, a light and thin dielectric substrate is applied, a thick and heavy wide-angle impedance matching layer is omitted, the antenna array is lighter, and the metal floor is bent at a certain radian so that the antenna array can be conveniently installed on a working platform. In the fL-8fL frequency band, 45-degree scanning active standing waves can be smaller than 3, and the overall height of the antenna is smaller than 0.53 high-frequency wavelengths.

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 discloses a vehicle-mounted 4G knife type antenna comprising a dielectric substrate, an antenna radiating unit printed on the front side of the dielectric substrate, and a metal floor. The antenna radiating unit consists of a low-frequency radiated branch segment, a high-frequency radiated branch segment, and a short-circuit branch segment connected between the antenna radiating unit and the metal floor. A microstrip feeder line for feeding power for the antenna is arranged at the edge of the antenna radiating unit; and a parasitic coupling patch is arranged on the back of the dielectric substrate. The antenna has the following advantages: the requirement on the shark fin outer case dimension is met; the 4G frequency band bandwidth is covered; the standing wave characteristic in the frequency band is good; and the antenna is suitable for automotive 4G communication.

The invention provides an all-metal laptop antenna. The antenna comprises a bracket, an antenna body and an impedance matching circuit. As a kerf is formed in an all-metal substrate of an all-metal laptop, the antenna body is structurally divided into two parts which are arranged on the two sides of the bracket in a covering mode; in combination with the impedance matching circuit, a metal frame arranged above the kerf plays a role in radiating a low-frequency signal, and the antenna body plays a role in constructing a high-frequency resonance wave. The all-metal laptop antenna has better adaptability to the working environment of the antenna, is suitable for application in the situation that the antenna constraining environment is poor and can well meet the communication requirement of the all-metal ultra-thin laptop. The antenna of the gap-type metal laptop is low in return loss and high in working efficiency, and the space occupied by the antenna is effectively reduced; accordingly, the antenna provides favorable conditions for further miniaturization design of the metal laptop provided with the antenna structure.

The invention discloses a double-layer butterfly antenna and belongs to the field of local discharge UHF detection technologies. The double-layer butterfly antenna comprises a dielectric substrate, afirst butterfly patch arranged on the upper surface of the dielectric substrate and a second butterfly patch arranged on the lower surface of the dielectric substrate, wherein a first microstrip lineconnected with the first butterfly patch is arranged in the middle of the upper surface of the dielectric substrate, a second microstrip line is arranged in the middle of the lower surface of the dielectric substrate, the two ends of the second microstrip line are connected with the second butterfly patch and the first microstrip line respectively, the first microstrip line and the second microstrip line are etched on the upper surface of the dielectric substrate and the lower surface of the dielectric substrate respectively, the two ends of the first butterfly patch are provided with notchesrespectively, and the two ends of the second butterfly patch are provided with notches respectively. Through the double-layer butterfly antenna, on the premise of guaranteeing antenna miniaturization,more electromagnetic wave signals can be received, and the detection sensitivity and anti-interference capability of a UHF detection system are improved.

The invention discloses a broadband amplifier with operating frequency approaching fT/2; the invention adopts the technical scheme that the LC series resonant circuit is connected in parallel with thecascode structure, which improves the high-frequency gain of the gain unit and expands the low-frequency bandwidth of the gain unit at the same time, and furthermore, realizes the effect of high gainand wide frequency band at the position approaching to fT/2. The matching circuit of the invention is composed of on-chip passive devices, and when designing the matching network, the parasitic effect of the signal input and the output Pad in the F band is taken into consideration, so that the stability and the feasibility of the circuit are ensured. The gain unit in the present invention is biased by a bandgap reference circuit, and the bias current can be accurately adjusted by controlling the bias voltage to achieve the optimal performance of the amplifier.

The invention relates to an antenna device. The antenna device comprises a first antenna, a first duplexer, a control unit, a first matching adjustment unit and a first coupling adjustment unit, wherein the first antenna is used for receiving and sending signals, the first duplexer is electrically connected with the first antenna and is used for separating the signals received by the first antennainto the low frequency signals and the high frequency signals, the control unit is used for determining intensity of the signals received by the first antenna, the first coupling adjustment unit is controlled by the control unit according to the signal intensity of the low frequency signals after separation by the first duplexer for adjusting a resonance frequency point of the first antenna so asto expand the low frequency bandwidth of the first antenna and change the low frequency operation frequency band, and the first matching adjustment unit is controlled by the control unit according tothe signal intensity of the high frequency signals after separation by the first duplexer for adjusting the resonance frequency point of the first antenna so as to expand the high frequency bandwidthand change the high frequency operation frequency band and further expand the low frequency bandwidth of the first antenna and change the low frequency operation frequency band.

The invention discloses a portable electronic device and an antenna structure thereof. The antenna structure comprises a first radiator, a second radiator, a second coupling part and a switching circuit; the first radiator comprises a feed-in part and a first radiator body; the second radiator comprises a first coupling part, a second radiator body and a grounding part; the first coupling part is connected with a first end part of the second radiator body; the grounding part is connected with the second radiator body; and the first radiator body is partly located between the first coupling part and the second coupling part. When the antenna structure is in a first mode state, a pathway is formed between the second radiator body and the second coupling part by the switching circuit; and when the antenna structure is in a second mode state, an open way is formed between the second radiator body and the second coupling part by the switching circuit.

The invention relates to a dual-polarized high-isolation indoor distribution antenna. The antenna is characterized by comprising a vertical polarized antenna which comprises two semicircular copper sheets perpendicular to each other and a circular copper sheet located above the semicircular copper sheets, and feeds through a feed hole located in the center of a dielectric plate; the antenna further comprises a horizontally polarized antenna which is composed of two parts located on the upper surface and the lower surface of the dielectric plate, four printed dipoles, four arc parasitic patches and four metal strips are arranged on the upper surface of the dielectric plate, a one-to-four power divider is arranged on the lower surface of the dielectric plate, and a dumbbell-shaped structure formed by gaps and rectangular holes is arranged in the middle of the printed dipoles. The indoor distribution antenna can cover the frequency bands of 1.71 GHz to 2.69 GHz and 3.3 GHz to 3.6 GHz at the same time, is applied to 3G/LTE/5G, and has the characteristics of high port isolation, low out-of-roundness and low profile.

The invention discloses a miniaturized ultra-wideband low-frequency radiation unit, which is applied to a high-low frequency nested array. The low-frequency radiation unit is composed of four groups of monopole radiation electric arms with disconnected middle parts and sheet metal baluns with windows laminated up and down, and a coupling metal sheet is loaded between two adjacent monopole radiation electric arms; and a pair of the monopole radiation arms which are diagonal to each other have the same polarization direction, 75-ohm radio frequency cables with the same length are welded at a feed point, and the two 75-ohm cables in the same polarization direction are welded together through a feed groove and then are connected with a 50-ohm feed line for excitation. The miniaturized ultra-wideband low-frequency radiation unit has the advantages of the small size, the light weight, the ultra wide band, simple matching and low cost. The invention also provides a high and low frequency nested array.

A multi-band antenna provided by the present invention comprises a main antenna, a parasitic antenna and a switching circuit, the main antenna comprises a radiation part, a feed-in part, a grounding part and a grounding extension path connected with the radiation part and the grounding part, and the feed-in part is used to feed in a current signal. The grounding part is used to provide the ground connection to the multi-band antenna, the switching circuit is electrically connected with the grounding extension path and is used to switch different matching circuits to the grounding extension path to change the low frequency resonant frequency of the multi-band antenna, and the parasitic antenna is in interval arrangement with the main antenna, is coupled to the main antenna and is used to motivate a high frequency resonance modality. The multi-band antenna possesses a wider bandwidth. The present invention also relates to a wireless communication device possessing the multi-band antenna.

The invention relates to a dual-polarization filtering antenna unit and a dual-polarization filtering antenna array, and relates to the technical field of antennas. The dual-polarization filtering antenna unit comprises a metal substrate and a radiation layer, wherein a plurality of dielectric layers are arranged between the metal substrate and the radiation layer, each dielectric layer has a first via hole and a second via hole, the first via holes and the second via holes are used for accommodating metal columns, the metal columns are used for transmitting current signals, the axes of the first via holes of the plurality of dielectric layers are parallel and are spaced at a preset distance, and the first via holes of the upper and lower adjacent dielectric layers are electrically connected through the metal layer between the upper and lower adjacent dielectric layers. According to the dual-polarization filtering antenna unit and the dual-polarization filtering antenna array of the invention, the first via holes and the second via holes are loaded, the first via holes and the second via holes are combined to generate a plurality of resonance modes, on one hand, a radiation zero point is generated in a stop band and a relatively good band elimination filtering effect is realized; and on the other hand, the low-frequency bandwidth of the antenna unit is expanded, and the miniaturization and multiband design of the antenna is realized.

The invention provides a debugging device of a built-in monopole antenna in the context of a large size mainboard, comprising a built-in monopole antenna and a large size mainboard; wherein the built-in monopole antenna is provided with a singal feed point; the debugging device of a built-in monopole antenna in the context of a large size mainboard further comprises an interconnecting piece for connecting the built-in monopole antenna and the large size mainboard at the signal feed point far away from the monopole antenna; the built-in monopole antenna of the invention is grounded at the position far away from the signal feed point, as a result, low band width in consumer electronic devices for receiving communication signals is greatly expanded and high frequency property is tremendously improved.