7results about How to "Improving Impedance Bandwidth" patented technology

The application discloses a miniaturized multilayer capacitive coupling LTCC dual-frequency antenna, which comprises an LTCC substrate, four metal layers embedded in the LTCC substrate, and a feeding electrode, a rear auxiliary electrode, a left ground electrode and a right ground electrode packaged on the surface of the LTCC substrate. The LTCC substrate comprises five dielectric layers, and the four metal layers are sequentially stacked in the vertical direction and are separated by the dielectric layers between adjacent metal layers. The four metal layers comprise a first coupling patch and a second coupling patch, a third coupling patch, a first radiation plate and a second radiation plate. The first coupling patch and the third coupling patch are coupled with the first radiation plate through interlayer coupling to generate a first resonant frequency; and the second coupling patch and the second radiation plate are coupled through interlayer coupling to generate a second resonant frequency which is higher than the first resonant frequency. The application realizes dual-frequency operation in a small size by optimizing the antenna structure, and has the characteristics of simple structure, easy processing and stable performance.

The present invention discloses a bidirectional radiating planar dipole antenna array operating in the millimeter wave frequency band, comprising a first metal sheet, a first dielectric substrate, a second dielectric substrate, a second metal sheet, a third dielectric substrate, and a third metal sheet; the first metal sheet is attached to the upper surface of the first dielectric substrate; the second dielectric substrate is attached to the lower surface of the first dielectric substrate; the third dielectric substrate is located below the second dielectric substrate; the upper and lower sides of the second metal sheet are attached to the lower surface of the second dielectric substrate and the upper surface of the third dielectric substrate respectively, and the third metal sheet is attached to the lower surface of the third dielectric substrate. The present invention realizes bidirectional radiation characteristics within the operating frequency band, and simultaneously realizes high gain and low profile characteristics. The antenna array consists of two dipole antenna units with the same structure and a power divider.

This invention discloses a microwave and millimeter-wave circularly polarized antenna based on a SIW circular cavity, comprising a first dielectric substrate, a second dielectric substrate, a millimeter-wave radiating patch, a microwave radiating patch, a microwave feed patch, a metal via, a millimeter-wave SIW circular cavity, a metal ground plane, a microwave feed probe, a microwave feed network, and a millimeter-wave feed network. The upper surface of the first dielectric substrate is printed with the millimeter-wave radiating patch, the microwave radiating patch, and the microwave feed patch. The millimeter-wave radiating patch has a radiating slot, and the microwave feed patch and the microwave radiating patch are connected. The second dielectric substrate is located directly below the first dielectric substrate. The upper surface of the second dielectric substrate is printed with a metal ground plane, and feed slots and feed circular holes for the microwave feed probe to pass through are etched on the metal ground plane. The lower surface of the second dielectric substrate is printed with the microwave feed network and the millimeter-wave feed network. This invention has advantages such as multi-frequency operation, wide bandwidth, and dual circular polarization, and has certain potential in wireless communication applications.

The invention discloses a broadband circularly polarized antenna which comprises a feed structure and a radiation structure, the feed structure adopts a double-layer dielectric structure, a floor is distributed in the middle of the double-layer dielectric structure, an upper feeder line is distributed between the floor and a top dielectric layer, and a lower feeder line is distributed between the floor and a lower dielectric layer. The upper-layer feeder line is distributed between the floor and the bottom-layer medium, the lower-layer feeder line is distributed between the floor and the bottom-layer medium, the upper-layer feeder line and the lower-layer feeder line are connected through a via hole structure, and the position setting of a total feed port of the antenna meets the condition that the phase difference of the antenna excited by the upper-layer feeder line and the lower-layer feeder line is 90 degrees. According to the invention, the upper and lower layers of transmission lines are connected by adopting a double-layer dielectric plate structure and a via hole mode, and the phase difference of the two sections of transmission lines to excite the antenna is 90 degrees by selecting the position of a port, so that the relatively strong frequency change characteristic and loss caused by the use of an additional multi-section phase shift microstrip line and a power divider structure are avoided; and the complexity and the overall size of the feed structure are reduced.

The present invention discloses a left-hand circular polarization reconfigurable implantable antenna and a reconfigurable method, comprising a lower dielectric substrate and an upper dielectric substrate, wherein an antenna radiation unit is arranged on the upper surface of the lower dielectric substrate, a metal floor is arranged on the lower surface of the lower dielectric substrate, and the upper dielectric substrate covers the antenna radiation unit, and the antenna radiation unit is divided into two parts by a U-shaped groove, and a switching diode group is arranged on the two arms of the U-shaped groove to connect the two parts of the antenna radiation unit. The present invention has the advantages of large impedance bandwidth, miniaturization, circular polarization, polarization mismatch resistance, high gain, and left-hand circular polarization switchability, and can be applied to mobile medical communications to solve the polarization mismatch problem.

The present invention discloses a low sidelobe broadband low cross-polarization planar dipole antenna array, comprising a multilayer dielectric substrate; a first metal surface; a second metal surface; a feed network; a dipole antenna array; each dipole antenna unit comprises a top dipole arm, a middle dipole arm, and a bottom dipole arm; the first metal surface is connected to one end of the top dipole arm; the second metal surface is connected to one end of the bottom dipole arm; the feed network comprises a signal conducting strip and a metallized through hole; the signal conducting strip at the output end of the feed network is directly connected to the signal input end of each dipole antenna unit; the antenna array etches a pair of slits at appropriate positions, so that the dipole works in a half-wavelength mode and a 1.5 times wavelength mode at the same time, greatly improving the impedance bandwidth of the dipole antenna. The antenna array adopts a SICL structure for feeding, which can effectively suppress the cross polarization of the dipole antenna, and the SICL structure works in a quasi-TEM mode without a cutoff frequency.

The invention discloses a bandwidth improving method based on a thin-film small antenna, an antenna and electronic equipment, and the method comprises the steps: carrying out the model construction under the condition that the area of an original thin-film small antenna meets the impedance matching requirement, obtaining an original thin-film small antenna model, introducing a penalty function, and multiplying the material density with a penalty material volume factor, and taking the average material volume factor as a constraint condition, carrying out topological optimization on the original thin film small antenna by using a variable density method of which the difference value type is SIMP, carrying out multiple times of iterative calculation in topological optimization to adjust material distribution, and taking the maximum magnetic layer average stress as a target function until a preset number of iterations is reached to obtain the thin film small antenna after iteration. According to the invention, the thickness and the area of the original thin-film small antenna are not changed and guaranteed, the shape of the original thin-film antenna is subjected to topological optimization by taking the optimal bandwidth as the target to obtain the improved thin-film small antenna, the antenna processing complexity can be reduced, the impedance bandwidth of the antenna is effectively improved, and thus the requirement of a system for the antenna bandwidth is met.