6 results about "Antenna input impedance" patented technology

The invention provides an ultra-wideband four-arm dipole antenna for an unmanned aerial vehicle-mounted ground penetrating radar. The ultra-wideband four-arm dipole antenna comprises an antenna upper arm which comprises a first upper arm antenna and a second upper arm antenna which are symmetrically arranged; and the antenna lower arm is conducted with the first upper arm antenna and the second upper arm antenna through a first conductive connecting piece and a second conductive connecting piece respectively to form an equivalent parallel structure. The pair of upper arms introduced by the four-arm dipole antenna provided by the invention is coupled with the resistance-capacitance loading dipole antenna serving as an original antenna, and the antenna can generate a new resonance point under the coupling action, so that the bandwidth of the antenna is effectively expanded. Meanwhile, the input impedance imaginary part of the original antenna is obviously improved and is close to 0 in most frequency bands, the radiation characteristic of the antenna is effectively improved, and the antenna gain is finally improved.

This invention relates to a directional borehole radar antenna and its implementation method, comprising a metal radiating plate, a dielectric substrate, a loading resistor, a loading dielectric, a metal reflector, and a loading capacitor. Distributed resistance loading is applied to the antenna arm, defining the resistance value of the end loading resistor and optimizing other resistors; an exponentially tapered structure is set at the feed point to suppress changes in the antenna input impedance, and a semi-elliptical arc structure is set at the end; a loading dielectric and a reflector are introduced, the distance between the metal reflector and the antenna is adjusted according to the dielectric constant of the dielectric substrate, and the antenna beamwidth is also adjusted; the borehole radar is placed inside the borehole and a trigger pulse is applied at a specified time, causing the antenna to transmit and receive electromagnetic waves around the borehole. The borehole radar moves along the borehole, successively acquiring all stratigraphic information of the entire borehole. This achieves directional transmission and reception of electromagnetic waves, or directional and precise detection of target objects within a narrow frequency band and around the borehole.

This application relates to the field of wireless power transfer technology and discloses a ring-shaped distributed hybrid energy storage and in-flight wireless power replenishment system, including a ground-based transmitting base station and an airborne receiving terminal. The airborne receiving terminal includes multiple circumferentially distributed fan-shaped battery compartments, each integrating an antenna array, hybrid energy storage, and a control routing module. The control routing module adjusts the antenna input impedance according to the battery status: switching to a matched state to absorb microwave energy when charging is needed; and switching to a total reflection mismatch state when fully charged or in a faulty state, using the increased radar cross-section to reflect pilot signals for identification by the ground base station and to form an energy null trap. The hybrid energy storage module uses supercapacitors to smooth power pulsations in time-division duplex mode. The system employs a microcapsule phase change fluid loop for thermal management. This invention achieves on-demand energy distribution without the need for an independent communication link, improving the stability of energy transfer and the system's thermal safety.

The invention provides an automobile key radio frequency impedance adjusting method and device, a medium and a program product, and relates to the technical field of automobile intelligent keys.The method comprises the steps that input impedance and return loss of a plurality of PCB antennas are measured through a vector network analyzer, and an impedance circuit capable of adjusting impedance is additionally arranged at the input ends of the PCB antennas; adjusting the input impedance to a preset first impedance value by adjusting an impedance matching network of the impedance circuit for the first time; measuring the output impedance of the power amplifier and the impedance circuit through a vector network analyzer; and adjusting the impedance matching network of the impedance circuit for the second time to adjust the output impedance to a preset second impedance value. The problem that radio frequency energy efficiency is low due to the fact that radio frequency impedance is difficult to flexibly adjust in the prior art is solved.

The application discloses a low-profile base station antenna and a dual-polarized antenna array, and the low-profile base station antenna comprises a first radiator, a second radiator, an upper dielectric plate, a lower dielectric plate, a metal ground and a support column, the first radiator is arranged on the top surface of the upper dielectric plate, the second radiator is arranged on the bottom surface of the upper dielectric plate, and the top points of the first radiator and the second radiator are arranged in alignment with each other; the upper dielectric plate is arranged on the top side of the lower dielectric plate and is connected through the support column; and the metal ground is arranged on the bottom surface of the lower dielectric plate. Through the structural design of the low-profile base station antenna, the multi-radiation arm technology or the artificial magnetic conductor technology mentioned in the background art is not needed, and only the input impedance of the antenna is adjusted to match by changing the structure and working mode of the antenna itself, so that the antenna profile is reduced to 0.094 lambda c (lambda c is the free space wavelength corresponding to 2350 MHz), and the wide frequency communication frequency band of 2010-2690 MHz can be covered.

The present disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate than a 4G communication system such as LTE. An electronic device in a wireless communication system, according to the present disclosure, comprises an RF transmitter and a control unit, wherein the RF transmitter comprises: a power amplifier that amplifies power of a signal; an antenna that transmits the signal; and an output power adaptive optimizer disposed between the power amplifier and the antenna to adjust antenna input impedance, and the control unit may optimize output power of the power amplifier by adjusting the antenna input impedance by using the output power adaptive optimizer.