9 results about "Monopulse antennas" patented technology

The application provides a leaky-wave antenna array based on a multimode substrate integrated waveguide coupler, relates to the technical fields of wireless communication and radar, and comprises a dielectric substrate, a multimode substrate integrated waveguide coupler and two leaky-wave antenna units. The multimode substrate integrated waveguide coupler is integrated on the dielectric substrate and is configured to excite modes and modes of the substrate integrated waveguide respectively in the same frequency range, generate even-mode signals with equal amplitude and in-phase and odd-mode signals with equal amplitude and opposite phase. The two leaky-wave antenna units are symmetrically arranged on the two sides of the upper surface metal layer of the dielectric substrate and are connected with two output ports of the multimode substrate integrated waveguide coupler respectively. The two leaky-wave antenna units are configured to radiate a wave beam and a difference wave beam in response to the even-mode signals and the odd-mode signals. The application solves the problem of low measurement accuracy of a traditional single-pulse antenna, has the technical effects of simplifying the design of a feed network, improving radiation performance and thus improving measurement accuracy.

The application provides a leaky-wave antenna array based on a multimode substrate integrated waveguide coupler, relates to the technical fields of wireless communication and radar, and comprises a dielectric substrate, a multimode substrate integrated waveguide coupler and two leaky-wave antenna units. The multimode substrate integrated waveguide coupler is integrated on the dielectric substrate and is configured to excite modes and modes of the substrate integrated waveguide respectively in the same frequency range, generate even-mode signals with equal amplitude and in-phase and odd-mode signals with equal amplitude and opposite phase. The two leaky-wave antenna units are symmetrically arranged on the two sides of the upper surface metal layer of the dielectric substrate and are connected with two output ports of the multimode substrate integrated waveguide coupler respectively. The two leaky-wave antenna units are configured to radiate a wave beam and a difference wave beam in response to the even-mode signals and the odd-mode signals. The application solves the problem of low measurement accuracy of a traditional single-pulse antenna, has the technical effects of simplifying the design of a feed network, improving radiation performance and thus improving measurement accuracy.

A Ka band monopulse antenna system with a compact size (diameter: 160 mm; height: 25 mm). The monopulse antenna system consists of a monopulse comparator; an unequal power divider and an array of 448 radiating slot antenna elements. The research results of the invention are as follows: the antenna operates in the Ka band frequency range; the realized gain at the center frequency is 34.2 dBi; the sidelobe level of the sum beam on the two E and H planes is less than −25 dB; the difference between the two peaks of the beams on the difference beam is small (about 0.1 dB); the peak-null difference of the difference beam is greater than 43 dB.

The application discloses a compact full-metal multi-beam single-pulse antenna, and belongs to the technical field of antennas.The application solves the problems of narrow bandwidth, low feed efficiency and small mechanical strength of a one-dimensional multi-beam single-pulse antenna.The technical points of the application are as follows: the compact full-metal multi-beam single-pulse antenna is composed of a sum-difference comparator based on a half-height slot gap waveguide and a planar dragon's breath lens composed of sliding symmetrical pins.The sum-difference comparator comprises two feed ports, two sections of slot gap waveguides with different widths and a matching pin.The application is suitable for a large-view-field multi-beam single-pulse radar system.

The application discloses a millimeter wave single-pulse filtering array antenna based on a gap waveguide and a difference network feed, which comprises an SIW filtering antenna array and a GWG and difference network structure; the GWG and difference network structure is composed of three layers of metal plates with square metal pins, adjacent two layers of metal plates are filled with air, and adjacent two layers of metal plates and the protruding pins form a GWG unit; the SIW filtering antenna array is composed of three layers of dielectric substrates covered with metal layers and a layer of prepreg, metal holes are loaded in the dielectric substrates and the prepreg to form resonant cavities of the antenna, and slots are loaded on the metal layers to realize the coupling between the cavities and the radiation of the antenna. The application combines the filtering antenna with the single-pulse antenna, simultaneously has the frequency selection characteristic of the filtering antenna and the high-precision target positioning characteristic of the single-pulse antenna, and has the advantages of high integration and multi-function.

This invention provides a miniaturized multi-fed monopulse antenna, characterized by comprising an antenna array, a feeding module, a control module, and at least three feeding channels; at least one feeding channel is located at the center of the antenna array, and the other at least two feeding channels are located at a distance of N times the waveguide wavelength from the center of the antenna array, where N is a positive integer; the feeding module generates a feeding signal, the control module controls the amplitude and phase of the feeding signal, and the feeding channels transmit the feeding signal to the antenna array when in the active state; the antenna array transmits sum and difference beams under the excitation of the feeding signals corresponding to different feeding channels. This invention only requires the control module to control the amplitude and phase of the feeding signal and set the feeding position of the feeding channels, eliminating the need for complex sum and difference beamforming networks, thereby greatly reducing circuit size, manufacturing cost, and parasitic radiation.

The application relates to a method for realizing a sidelobe-cancelling beam of a phase-frequency scanning monopulse antenna, and belongs to the technical field of antennas. By virtue of the technical advantages of an active phase-frequency scanning antenna system, a sidelobe-cancelling beam is realized by giving a set of specific amplitude-phase weighting and optimizing combination of an antenna beam, the influence of a space interference signal on the performance of a radar is reduced, the actual measurement effect reaches the expected target, and the method can be used as a reference for realizing a sidelobe-cancelling beam.

The present invention discloses a substrate-integrated waveguide monopulse slot antenna with a dual-mode comparator and a radiation method thereof. The antenna comprises a first top metal layer, a 4N-channel radiation slot, a sum port, and a first difference port; a first dielectric substrate, a first substrate-integrated waveguide cavity comprising a first metal via, a second metal via, two 4N-channel power splitters, and a first dual-mode comparator; and a first coupling slot on the first metal bottom plate. A second top metal layer comprises a second coupling slot, a second difference port, and a third difference port; and a second dielectric substrate, a second substrate-integrated waveguide cavity comprising a third metal via, a fourth metal via, and a second dual-mode comparator. The first dual-mode comparator forms a sum beam and a difference beam on the xoz plane, respectively, while the second dual-mode comparator forms a difference beam and a dual difference beam on the yoz plane. The antenna of the present invention has the advantages of simplicity, compactness, high efficiency, low cost, and ease of integration, greatly simplifying the design of the monopulse antenna.

The invention discloses a rapid optimization method of a monopulse antenna narrow beam, and relates to rapid optimization of a four-horn feed source array monopulse antenna narrow beam based on the combination of a genetic algorithm, a geometrical optical method and an aperture field method. In the proposed optimization technology, far-field beam characteristic analysis of the monopulse antenna is completed by adopting an analytic expression method combining geometrical optics and an aperture field method, and analytic expression calculation of monopulse beams is nested in a genetic algorithm, so that an integrated design program of monopulse antenna far-field beam analysis calculation and beam optimization is realized. Compared with the modeling and manual parameter adjustment optimization process of the traditional full-wave simulation software, the method provided by the invention has the advantages that the modeling step is omitted, and meanwhile, the occupied hardware resources in the beam analytic expression calculation process are relatively less, so that the calculation speed is higher, the time cost of design optimization is lower, and the optimization efficiency is high.