7 results about "Radiation bandwidth" patented technology

The invention provides a miniaturized broadband non-reflection filtering antenna and communication equipment, and relates to the field of communication antennas. The antenna comprises a hybrid coupling resonance system and a matched absorption network, wherein the hybrid coupling resonance system comprises a main radiation groove which is formed in a metal floor and is of a split ring structure, and two parasitic radiation grooves which are of a U-shaped structure and are located on the two sides of the main radiation groove respectively; the matching absorption network comprises an absorption resistor connected with the feed microstrip line in parallel and an absorption microstrip line connected with the absorption resistor in series. According to the embodiment of the invention, the absorption circuit is integrated on the structure, so that the antenna has the non-reflection characteristic in the range of 1.27-2.31 GHz far beyond the radiation bandwidth, the defect that the radio frequency front-end performance is deteriorated due to in-band reflection and out-of-band energy reflection back to a transmitting channel of a traditional antenna is effectively overcome, and the electromagnetic compatibility and the linear characteristic of the whole system are remarkably improved.

The application provides a miniaturized broadband non-reflection filtering antenna and communication equipment, and relates to the field of communication antennas. The antenna comprises a hybrid coupling resonance system and a matching absorption network, wherein the hybrid coupling resonance system comprises a main radiation slot of an open loop structure provided on a metal ground plate, and two parasitic radiation slots of a U-shaped structure respectively located on both sides of the main radiation slot; the matching absorption network comprises an absorption resistor connected in parallel with a feeding microstrip line, and an absorption microstrip line connected in series with the absorption resistor. According to the application, the absorption circuit is integrated on the structure, so that the antenna presents the non-reflection characteristic in the range of 1.27-2.31 GHz which is far beyond the radiation bandwidth of the antenna, the defects of the traditional antenna, such as the in-band reflection and the out-of-band energy reflection back to the transmission channel to deteriorate the performance of the radio frequency front end, are effectively solved, and the electromagnetic compatibility performance and the linearity of the system as a whole are significantly improved.

The utility model provides a full-band antenna and a mobile terminal, the full-band antenna comprises a first radiation unit, a second radiation unit, a grounding point, a first feed point and a second feed point, the first radiation unit and the second radiation unit are both electrically connected with the grounding point, a first feed band and the second feed point, the first radiation unit and the second radiation unit are connected through a connecting piece, one end of the connecting piece is connected with the first radiation unit, the other end of the connecting piece is connected with the second radiation unit, and a gap area is formed between the first radiation unit and the second radiation unit. The full-band antenna provided by the utility model not only can effectively improve the overall radiation efficiency of the antenna, but also can widen the overall radiation bandwidth of the antenna.

Embodiments of the present application provide an antenna structure and an electronic device. The antenna structure comprises a radiator, a second radiator, a transmission line, a feed point and a ground point. The first end of the transmission line is electrically connected with the feed point, the second end of the transmission line is electrically connected with the first radiator and the second radiator respectively, and the first radiator is electrically connected with the ground point. The impedance of the first radiator in a first state and the impedance of the second radiator in a second state are conjugate. The first state is that the transmission line delivers electromagnetic energy to the first radiator alone, and the second state is that the transmission line delivers electromagnetic energy to the second radiator alone. When the transmission line feeds the first radiator and the second radiator at the same time, the load impedance of the first radiator and the second radiator can be adapted to each other, the modes of the first radiator and the second radiator can be fused with each other, the radiation bandwidth of the electromagnetic wave signal can be effectively increased, the radiation intensity of the antenna structure in a wide frequency band can be effectively increased, and the reliability of the communication of the electronic device can be improved.

A method for improving a lithographic process of imaging a portion of a design layout onto a substrate using a lithographic apparatus. The method includes computing a multi-variable cost function that is a function of: (i) a plurality of design variables that affect characteristics of the lithographic process and (ii) a radiation bandwidth of a radiation source of the lithographic apparatus; and reconfiguring one or more of the characteristics (e.g., EPE, image contrast, resist, etc.) of the lithographic process by adjusting one or more of the design variables (e.g., source, mask layout, bandwidth, etc.) until a termination condition is satisfied. The termination condition includes a speckle characteristic (e.g., a speckle contrast) maintained within a speckle specification associated with the radiation source and also maintaining an image contrast associated with the lithographic process within a desired range. The speckle characteristic being a function of the radiation bandwidth.

The invention discloses an ultra-wideband omnidirectional Vivaldi antenna array and a feed power divider thereof, and belongs to the technical field of antennas. The antenna array comprises a ground plane, an F4B dielectric plate, a feed network and twelve Vivaldi antenna units which are annularly arranged in a central symmetry mode, each antenna unit comprises a gradually-changed open slot and a three-ellipse combined resonant cavity, and the curve change rate r of an edge arc line of the gradually-changed open slot is optimized to be 0.13; the feed power divider is of a one-to-twelve-path equal-amplitude in-phase structure and is formed by combining a one-to-three-path power divider and a one-to-four-path power divider, the narrowest position of a microstrip line is 0.6 mm, and the relative bandwidth is 133.61%. By optimizing the antenna unit structure and the design of the power divider, the omnidirectional radiation bandwidth of 2.0-9.8 GHz is realized under the condition of only using 12 units, the horizontal plane gain fluctuation is less than 0.8 dB, and the transverse size is only 0.43 lambda, so that the problems of narrow bandwidth, large gain fluctuation, difficult processing of the power divider and large size in the prior art are solved, and the antenna is suitable for miniaturized ultra-wideband communication equipment.

The invention discloses a double-sided weak coupling antenna, and the antenna comprises a substrate which comprises a front surface and a back surface; the main antenna comprises a metal area arranged on the front surface of the substrate, and the front surface of the substrate is divided into a non-metal gap area; the independent radiation unit is a metal area arranged on the back face of the substrate, the projection of the independent radiation unit on the front face of the substrate is located in the non-metal gap area, and the independent radiation unit and the main antenna are not overlapped. According to the invention, a cooperative weak coupling mechanism is adopted, the electric field and magnetic field cooperative weak coupling mechanism is utilized, bandwidth expansion and efficiency optimization are realized under the limitation of an extremely small PCB size, the radiation bandwidth is remarkably improved, the radiation efficiency is remarkably improved, the space of the PCB is fully utilized, and the total area of the antenna is reduced.