7 results about "Electrically small antenna" patented technology

An electrically small antenna system modulates the Q factor of the antenna during electrical transmission to decrease the Q factor during signal transitions between frequency states thereby affecting an improved trade-off between antenna bandwidth and operating efficiency.

The present disclosure relates to a hybrid quantum sensor and method for detecting electromagnetic signals using the unique properties of Rydberg atoms and electrically small apertures. The sensor comprises an electrically small antenna that is non-resonant at a detection frequency that generates a concentrated electric field within a defined volume.

This invention relates to the field of antenna technology and provides a wide-bandwidth beam circularly polarized communication antenna, comprising a first radiator group (100) and a second radiator group (200). The first and second radiator groups have identical structures and are arranged in a spatially rotated 180-degree arrangement. The first radiator group (100) contains four structurally identical radiator elements (001, 002, 003, 004), and adjacent elements form a radiator pair (010, 020). The surface currents of the two radiator elements within each radiator pair are in phase to enhance radiation. The current phases of adjacent radiator pairs differ by 90 degrees, and the current phases of the two radiator groups differ by 180 degrees to achieve circularly polarized radiation. A pair of parallel metal strips (1) are connected between the two radiator groups to modulate impedance. The antenna of this invention is close to the size of an electrically small antenna, but achieves an impedance bandwidth of 11.18%, and a 3dB beamwidth that reaches 160 degrees in different cross sections and is uniform and stable, showing great potential for application in indoor communication and satellite navigation.

A matching technique for receivers with ESA so that the receiver can achieve low noise performance over a broad bandwidth. An electrically small dipole is matched directly to a parametric amplifier, without using any inductors. The parametric amplifier operates in a time-varying fashion, driven by a higher RF frequency pump, and exhibits a high impedance, time-varying capacitive load to the ESA. Therefore, the low frequency voltage output from the ESA is detected at the input of the parametric amplifier, being amplified and upconverted to the proximity of the pump frequency at the output with minimum contamination of noise in this process.

The invention relates to the technical field of antennas, and provides a broadband wide-beam circularly polarized communication antenna, which comprises a first radiator group (100) and a second radiator group (200), the first radiator group (100) and the second radiator group (200) have the same structure and are arranged by rotating 180 degrees in space, the first radiator group (100) comprises four radiator units (001, 002, 003, 004) with the same structure, and the second radiator group (200) comprises four radiator units (001, 002, 003, 004) with the same structure. The two radiating body units (010, 020) are arranged in parallel, two adjacent units form a radiating body pair (010, 020), the surface current phases of the two radiating body units in each radiating body pair are the same so as to enhance radiation, the current phase difference of the two adjacent radiating body pairs is 90 degrees, and the current phase difference of the two radiating body groups is 180 degrees so as to realize circularly polarized radiation. And a pair of parallel metal strips (1) is connected between the two radiator groups to modulate impedance. The size of the antenna is close to that of an electrically small antenna, but the impedance bandwidth of 11.18% is obtained, the 3dB wave width reaches 160 degrees on different sections and is uniform and stable, and the application potential in the aspects of indoor communication and satellite navigation is huge.

The application relates to the technical field of wireless communication, and discloses an electrically small antenna based on a magic cube structure, which comprises a metal ring structure formed by three-dimensional orthogonal folding, a cubic magic cube structure formed by splicing at least three different types of substrates, and three substrates with different quantities; the metal ring structure is printed on six substrates of the cubic magic cube structure by a microstrip line; wherein the metal ring structure excites a combination of a multi-magnetic double ring and an electric doublet in a single-feed or double-feed mode, and realizes omnidirectional radiation or dual-polarization function under a small electric size (ka < 1). The application can realize omnidirectional radiation or dual-polarization function under a small electric size (ka < 1), and the cubic frame formed by self-splicing of the substrates has electromagnetic isolation characteristics without additional packaging.

This invention belongs to the field of antenna technology, specifically relating to an omnidirectional small electric antenna, comprising: a metal cavity having a cavity enclosed by a shell; at least one set of antenna radiators located inside the metal cavity; and a bus connected to the metal cavity. This invention is small in size and lightweight, can be integrated inside a black box, is not easily affected by external electromagnetic interference, and provides stable antenna operation. The antenna's radiation performance is not affected by either side of the black box facing upwards.