An antenna includes a radiating element on a forward-facing surface of an underlying reflector, and a multi-element planar broadband lens in front of and within a radio frequency (RF) transmission path of the radiating element. The broadband lens includes first lens elements having first RF characteristics and second lens elements having second RF characteristics, which are different from the first RF characteristics. The first lens elements are arranged as a plurality of the first lens elements, which are encircled by an array of the second lens elements. Each of the first lens elements includes a first LC circuit, and each of the second LC circuits includes a second LC circuit with a smaller inductance relative to the first LC circuit.

An array of preferably electrically small scatterers is spaced at more or less regular intervals from a central transmitter. Each scatterer element includes a tunable or static reactive load which allows the propagation and fields generated by the central transmitter to be precisely controlled. Each scatterer element in the array also includes a resistive element whose value may change as a function of a distance between each scatterer and the central transmitter and which typically increases as a function of that distance. The central transmitter in the array nominally comprises an antenna, matching network, RF driver, and a vehicle, which may be a maritime vehicle or platform. The antenna for this transmitter may be comprised of an electrically small monopole oriented normal to the surface of the ocean or an electrically small loop antenna oriented with its magnetic moment parallel to the surface of the ocean.

An array of preferably electrically small scatterers is spaced at more or less regular intervals from a central transmitter. Each scatterer element includes a tunable or static reactive load which allows the propagation and fields generated by the central transmitter to be precisely controlled. Each scatterer element in the array also includes a resistive element whose value may change as a function of a distance between each scatterer and the central transmitter and which typically increases as a function of that distance. The central transmitter in the array nominally comprises an antenna, matching network, RF driver, and a vehicle, which may be a maritime vehicle or platform. The antenna for this transmitter may be comprised of an electrically small monopole oriented normal to the surface of the ocean or an electrically small loop antenna oriented with its magnetic moment parallel to the surface of the ocean.

An ultra-wideband electromagnetic source includes a voltage source and a pulser assembly electrically coupled to the voltage source. The pulser assembly includes a bipolar vector inversion generator (VIG) assembly, a peaking gap assembly coupled to the VIG assembly, and an oil lens assembly coupled to the peaking gap assembly. The ultra-wideband electromagnetic source also includes a balanced antenna assembly including one or more sets of antenna arms coupled to the oil lens assembly and an antenna reflector coupled to the one or more sets of antenna arms.

An ultra-wideband electromagnetic source includes a voltage source and a pulser assembly electrically coupled to the voltage source. The pulser assembly includes a bipolar vector inversion generator (VIG) assembly, a peaking gap assembly coupled to the VIG assembly, and an oil lens assembly coupled to the peaking gap assembly. The ultra-wideband electromagnetic source also includes a balanced antenna assembly including one or more sets of antenna arms coupled to the oil lens assembly and an antenna reflector coupled to the one or more sets of antenna arms.

A system includes a first antenna and a second antenna. The first antenna includes an antenna section. The antenna section includes a first antenna segment, a second antenna segment adjacent to the first antenna segment, and a notch circuit disposed within a notch between the first antenna segment and the second antenna segment. The notch circuit prevents a first frequency of a signal from passing from the first antenna segment to the second antenna segment while allowing a second frequency from the signal to pass from the first antenna segment to the second antenna segment. The second antenna is disposed proximate to the first antenna. The first antenna occupies a second near field region of the second antenna and the second antenna occupies a first near field region of the first antenna.

A system includes a first antenna and a second antenna. The first antenna includes an antenna section. The antenna section includes a first antenna segment, a second antenna segment adjacent to the first antenna segment, and a notch circuit disposed within a notch between the first antenna segment and the second antenna segment. The notch circuit prevents a first frequency of a signal from passing from the first antenna segment to the second antenna segment while allowing a second frequency from the signal to pass from the first antenna segment to the second antenna segment. The second antenna is disposed proximate to the first antenna. The first antenna occupies a second near field region of the second antenna and the second antenna occupies a first near field region of the first antenna.

This application provides a lens antenna, a detection apparatus, and a communications apparatus. The lens antenna includes a feed source, a radio frequency switch, at least two narrow beam radiation units, and a wide beam radiation unit. The feed source may selectively feed any narrow beam radiation unit or the wide beam radiation unit by using the radio frequency switch.

The narrow beam radiation unit or the wide beam radiation unit may be connected to the feed source by switching of the radio frequency switch. A first radiation region of the wide beam radiation unit covers a second radiation region of each narrow beam radiation unit. The wide beam radiation unit includes a plurality of radiation sub-units, and the plurality of radiation sub-units are connected to the radio frequency switch by using a power splitter. In this way, radiation of the plurality of radiation sub-units forms a wide beam.

This application provides a lens antenna, a detection apparatus, and a communications apparatus. The lens antenna includes a feed source, a radio frequency switch, at least two narrow beam radiation units, and a wide beam radiation unit. The feed source may selectively feed any narrow beam radiation unit or the wide beam radiation unit by using the radio frequency switch.

The narrow beam radiation unit or the wide beam radiation unit may be connected to the feed source by switching of the radio frequency switch. A first radiation region of the wide beam radiation unit covers a second radiation region of each narrow beam radiation unit. The wide beam radiation unit includes a plurality of radiation sub-units, and the plurality of radiation sub-units are connected to the radio frequency switch by using a power splitter. In this way, radiation of the plurality of radiation sub-units forms a wide beam.

An electromagnetic wave transmission structure including a substrate, at least one transmission line, antennas, and tunable dielectric units is provided. The transmission line includes a first extending portion and second extending portions. The first extending portion is extended in a first direction. The second extending portions are respectively extended from two opposite edges of the first extending portion, and an extending direction thereof is parallel to a second direction. The second extending portions are arranged along the first direction. The antennas are disposed near the at least one transmission line. The tunable dielectric units are overlapped with portions of the at least one transmission line located between the antennas. Each tunable dielectric unit has an overlapped first electrode layer and controllable dielectric layer. The controllable dielectric layer is disposed between the first electrode layer and the at least one transmission line.