A radar sensor includes: a radar antenna, a radar lens and a funnel element between the radar antenna and the radar lens. The funnel element includes a material which absorbs the radar radiation emitted by the radar antenna.

A radar sensor includes: a radar antenna, a radar lens and a funnel element between the radar antenna and the radar lens. The funnel element includes a material which absorbs the radar radiation emitted by the radar antenna.

The invention concerns an electromagnetic absorbent comprising: a metal earth plane, an insulating dielectric substrate, disposed on said metal earth plane, a set of metal resonant elements disposed on said insulating dielectric substrate, the electromagnetic resonant frequency of a resonant element being adjusted by adapting the dimensions of the resonant element, the set of resonant elements comprising resonant elements with different dimensions so as to enable the production, by juxtaposition of different electromagnetic resonant frequencies, of a predetermined electromagnetic absorption band. An elementary pattern formed by a plurality of metal resonant elements can be replaced periodically.

The invention concerns an electromagnetic absorbent comprising: a metal earth plane, an insulating dielectric substrate, disposed on said metal earth plane, a set of metal resonant elements disposed on said insulating dielectric substrate, the electromagnetic resonant frequency of a resonant element being adjusted by adapting the dimensions of the resonant element, the set of resonant elements comprising resonant elements with different dimensions so as to enable the production, by juxtaposition of different electromagnetic resonant frequencies, of a predetermined electromagnetic absorption band. An elementary pattern formed by a plurality of metal resonant elements can be replaced periodically.

An antenna module (1) with a number of antennas (11). Each antenna (11) includes a number of antenna elements and a number of elongated antenna contact elements (112). The antenna contact elements (112) are each configured to establish contact with an associated conductive path of a printed circuit board (2) via a movement of the antennas (11) and the printed circuit board (2) towards each other. The antenna module further includes a shielding with a shielding frame (12) and a shielding cover (15). The shielding frame (12) has a proximal shielding frame end that is configured for mounting on the printed circuit board (2) under circumferential contact. The shielding cover is in circumferential contact with the shielding frame (12). The shielding carrying the number of antennas (11, 11′).

An antenna module (1) with a number of antennas (11). Each antenna (11) includes a number of antenna elements and a number of elongated antenna contact elements (112). The antenna contact elements (112) are each configured to establish contact with an associated conductive path of a printed circuit board (2) via a movement of the antennas (11) and the printed circuit board (2) towards each other. The antenna module further includes a shielding with a shielding frame (12) and a shielding cover (15). The shielding frame (12) has a proximal shielding frame end that is configured for mounting on the printed circuit board (2) under circumferential contact. The shielding cover is in circumferential contact with the shielding frame (12). The shielding carrying the number of antennas (11, 11′).

An electromagnetic wave absorbing sheet is provided that can adequately absorb electromagnetic waves at high frequencies in and above the millimeter wave band, can have excellent flexibility, and can easily be placed in any desired portion.

The electromagnetic wave absorbing sheet includes an electromagnetic wave absorbing layer 1 containing a magnetic iron oxide 1a that magnetically resonates at frequencies in and above the millimeter wave band and a resin binder 1b. The electromagnetic wave absorbing sheet absorbs radiated electromagnetic waves by magnetic resonance of the magnetic iron oxide. The electromagnetic wave absorbing sheet has a flexibility evaluation value F (g/mm.sup.2) of more than 0 and 6 or less, which is determined by measuring an applied weight (g) that is required to bend a ribbon-like electromagnetic wave absorbing sheet in the elastic deformation region so that a distance d between the inner surfaces of the ribbon-like sheet at a position L spaced 10 mm from the bent portion of the ribbon-like sheet is 10 mm, and dividing the applied weight (g) by a cross-sectional area D (mm.sup.2) of the ribbon-like sheet.

An electromagnetic wave absorbing sheet is provided that can adequately absorb electromagnetic waves at high frequencies in and above the millimeter wave band, can have excellent flexibility, and can easily be placed in any desired portion.

The electromagnetic wave absorbing sheet includes an electromagnetic wave absorbing layer 1 containing a magnetic iron oxide 1a that magnetically resonates at frequencies in and above the millimeter wave band and a resin binder 1b. The electromagnetic wave absorbing sheet absorbs radiated electromagnetic waves by magnetic resonance of the magnetic iron oxide. The electromagnetic wave absorbing sheet has a flexibility evaluation value F (g/mm.sup.2) of more than 0 and 6 or less, which is determined by measuring an applied weight (g) that is required to bend a ribbon-like electromagnetic wave absorbing sheet in the elastic deformation region so that a distance d between the inner surfaces of the ribbon-like sheet at a position L spaced 10 mm from the bent portion of the ribbon-like sheet is 10 mm, and dividing the applied weight (g) by a cross-sectional area D (mm.sup.2) of the ribbon-like sheet.

A radar apparatus includes: a receiving unit including plural receiving antennas including an antenna element, and configured to receive incoming waves whose arrival directions are known; and a calculating unit configured to calculate a correction value for correcting an error component included in a received signal of the incoming waves received by the receiving unit based on the received signal, the correction value being depending on an azimuth of the antenna element.

In a general aspect, a system is disclosed for sensing radio frequency (RF) electromagnetic radiation. The system includes a receiver formed of dielectric material. The receiver includes a photonic crystal structure having an elongated slot disposed therein. The receiver also includes an antenna structure extending from the photonic crystal structure and configured to couple to a target RF electromagnetic radiation having a frequency in a range from 100 MHz-1 THz. A vapor or source of the vapor in the elongated slot. The system also includes a laser system configured to provide input optical signals to the elongated slot that interact with one or more electronic transitions of the vapor. The system additionally includes an optical detection system configured to detect the target RF electromagnetic radiation based on output optical signals from the elongated slot.