41results about How to "Realize wideband" patented technology

The invention discloses a broadband flat plate array antenna, broadband can be achieved, and array antenna gain can be improved. According to the broadband flat plate array antenna, a coupling groove is used for stimulating two micro-strip subarrays, at the time, the impedance of a single micro-strip wire is high, a radiation paster can easily carry out high-impedance matching, accordingly the bandwidth of the micro-strip subarrays is widened, broadband is achieved, the relative bandwidth (Sll < -10 dB) of the feeding mode can reach 16%, 1 dB gain bandwidth can reach 14.6%, and common structure bandwidth is only about 6%. In addition, an H-shaped base chip is used for integrating a waveguide feeding network, the micro-strip subarrays are connected in parallel for feeding, along with increasing of array units, the bandwidth is hardly changed, broadband features can be kept in a large array, and array antenna gain can be improved gradually. In addition, the feeding network is placed below the micro-strip subarrays, extra circuit area cannot be increased, and array antenna miniaturization is promoted. The broadband flat plate array antenna is suitable for promotion and application in the technical field of microwave and millimeter wave antennas.

The invention provides a double resonance double-excitation longitudinal vibration transducer, comprising a radiation head (1), a front crystal stack (2), intermediate mass (3), a back crystal stack (6), a tail load (7), a first insulation spacer, a second insulation spacer, a third insulation spacer, a forth insulation spacer, a nut (8) and a prestressed screw (12). By adjusting the series/parallel condition between each piezoelectric ceramic element in the front crystal stack (2) and the back crystal stack (6) and adjusting the connection mode of positive and negative electrodes of the front crystal stack (2) with the positive and the negative electrodes of the back crystal stack (6), a broadband emission transducer or a narrow-band high sensitivity emission transducer can be obtained respectively. The double resonance double-excitation longitudinal vibration transducer provided by the invention is characterized by low mechanical quality factor Qm, wide frequency band, less fluctuation and high sensitivity, and can be used as a broadband or narrow-band sound source in various detecting sonars, unmanned underwater vehicles or underwater communicators.

The invention discloses a circular polarization short backfire antenna with spiral feed source with higher broadband characteristic and smaller using volume from wireless communication antenna field, which comprises a master reflector (1), a sub-reflector (2), a feed source (3), as well as an assisting support (2); the feed source (3) comprises a helical antenna (31) and a feed point allocation device (32); the helical antenna (31) is coiled on the assisting support (2), one end is fixed with the assisting support (2), and the other end is connected with a signal output cable (5) through the feed point allocation device (32). Through adopting the helical antenna as the feed source of backfire antenna, the invention realizes the broadband and circular polarization of the antenna, meanwhile, the invention uses the helical wire to support and replace the special shaft, and to be connected with main parts of the antenna, thereby simplifying the antenna structure, reducing complexity of antenna processing technology, so as to benefit the mass production of the antenna.

The invention relates to a digital television transmitting antenna based on an E-shaped patch. The digital television transmitting antenna comprises a formation plate, the E-shaped patch, a rectangular parasitic patch, an input connector and a retaining screw, wherein the rectangular parasitic patch, the E-shaped patch and the formation plate are orderly arranged in parallel from top to bottom to form a main structure of a stacked antenna; the E-shaped patch is provided with two symmetric rectangular gaps, and the length of a middle wing is smaller than that of two sides; an outer conductor of the input connector is fixed on the formation plate, and an inner conductor of the input connector penetrates through the formation plate and is connected to the E-shaped patch to feed; the rectangular parasitic patch at the upper layer is coupled by the E-shaped patch to feed. The digital television transmitting antenna based on the E-shaped patch provided by the invention satisfies the use requirement of a terrestrial television broadcasting transmitting system by adopting a multi-resonator technology to improve the impedance bandwidth and power handling of antennas; the invention has the characteristics of being wide in working band, high in gain, small in input standing-wave ratio, high in power handling, simple in processing, convenient in debugging and the like, and is applicable to a terrestrial television transmitting antenna system of a decimeter wave band.

The invention belongs to the technical field of a wireless communication system and discloses a circularly polarized PIFA antenna with a high-stability phase center and a GPS positioning system. The antenna comprises a feed structure and a radiation structure, wherein the radiation structure comprises eight rectangular metal sheets and a metal column which are printed on an upper layer of a circular FR4 dielectric plate, the feed structure comprises a three-stage Wilkinson power division phase shifter and four coaxial lines which are printed on a lower layer of a rectangular FR4 dielectric plate, ports of the power divider excite the PIFA antenna to radiate energy through feed probes, and circular polarization performance and the relatively stable phase center of the antenna are realized by designing the symmetrical antenna structure, the symmetrical four-point uniform feed structure and four symmetrical feed points. The end-fire antenna has characteristics of radiation circular polarization, high stable phase center, low profile, light weight, easiness in processing and the like, and has a wide application prospect in the field of novel circular polarization PIFA antennas.

The invention discloses an antenna includes a first antenna unit and a second antenna unit. Each antenna unit of the first antenna unit and the second antenna unit includes a first antenna component and a second antenna component, the first antenna component has an annular structure is provided with a slot slit, the annular structure is provided with an outer periphery and an inner periphery limited by the line of rabbet joint, the second antenna component is coupled with the first antenna component, and the first antenna unit and the second antenna unit are arranged in a symmetrical mode. The antenna further includes a feed component which is respectively coupled with the first antenna component of the first antenna unit and the first antenna component of the second antenna unit, and the feed component is used for feeding the first antenna component of the first antenna unit and the first antenna component of the second antenna unit. According to the antenna, the facts of controllable wave beam, wide broadband and high gain can be achieved, and the concentration use of effective energy is ensured, the radiation efficiency of the antenna is greatly improved, and thus the requirements of the modern communication technology to the antenna can be met.

The invention discloses a broadband sleeve antenna for a portable terminal device, in combination with actual portable terminal device application, a broadband monopole sleeve antenna design based ona terminal structure body is provided under a condition that antenna structure size is limited, and an antenna band covers 225-678 MHz. In the design, conventional bandwidth broadening methods of adding lossy devices, such as a magnet ring, are discarded, and the design is realized through a sleeve structure and a helix loading mode, meanwhile, a spiral spring is designed to be roundabout so as torealize reduction of size, and a plurality of spiral radiators are connected in parallel under different thread pitches so as to realize broad band, thus, functions of a plurality of antennae can berealized by one antenna.

The invention provides a steel rail shock absorber which comprises a plate spring unit and a tuned mass unit, restrained points are arranged on the plate spring unit, at least one restrained point is restrained on a steel rail, the tuned mass unit is fixed to the plate spring unit, and the distance between the tuned mass unit and the restrained points forms a stress arm, and the tuned mass unit and the plate spring unit form a mass spring resonance subsystem. When the resonance frequency of a steel rail damper system is adjusted to be close to the resonance frequency of the steel rail, strong vibration of a subsystem is caused, counter-acting force with the reverse force phase is generated on a steel rail main system, and part of vibration energy transmitted by the steel rail main system is counteracted, or part of vibration energy is converted into other forms of energy such as heat energy and sound energy to be dissipated.

The invention discloses a miniaturized mobile terminal antenna supporting dual-mode coexistence. The antenna comprises a dielectric substrate, a first feed network, a second feed network, a first antenna radiation unit and a second antenna radiation unit, and is characterized in that the first antenna radiation unit is positioned on the front side of the second antenna radiation unit; the first radiation unit and the second radiation unit are respectively composed of a plurality of metal conductors, and the metal conductors are sequentially connected and distributed on different surfaces of the dielectric substrate, so that the overall size of the antenna is reduced, and the space utilization rate of the dielectric substrate and the space utilization rate of the mobile terminal are improved; a stepped impedance structure is formed in the first antenna radiation unit and the second antenna radiation unit to achieve broadband and multiband characteristics of the antenna, a fixed decoupling network is used for reducing coupling between the first antenna radiation unit and the second antenna radiation unit, and most of metal conductors are in the same plane, so batch production can be realized by adopting a common PCB processing technology; and the antenna has the advantages of low profile and wide coverage frequency band.