A dual slot SIW antenna unit includes a first substrate, a conductive layer, plural unit radiation members, a second substrate, a ground conductive layer, and two first conductor pillars. The plural unit radiation members are disposed in parallel on the conductive layer, and each unit radiation member includes at least a pair of slots that are disposed in parallel. The two first conductive pillars are disposed between two neighboring unit radiation members and electrically connect the feed routing layer and the conductive layer. A dual slot SIW antenna array module is also disclosed. By use of the dual slot structure, more radiation members are allowed to be included in a limited square measure for improving the antenna gain.

An antenna assembly includes a conductive plate having a slot formed within the conductive plate. A conductive coupling element is positioned within the slot of the conductive plate to form a slot antenna structure with the conductive plate. At least one conductive radiator element is positioned outside of the slot. An antenna feed structure is electrically coupled to the conductive coupling element and the at least one conductive radiator element. The antenna feed structure is configured to simultaneously resonate the slot antenna structure and the at least one conductive radiator element. The slot antenna structure and the conductive radiator element work in combination to resonate at substantially similar (e.g., overlapping) RF communication bands or at different RF communication bands.

The invention relates to an improved antenna which is distinguished by, among other things, the following features: the antenna has a monopole radiator (11), which is vertically polarized; the antenna has at least two horizontally polarized radiators, which lie offset from each other in a circumferential direction about a central axis (Z); the antenna has a reflector (1), in front of which the at least two horizontally polarized radiators and the monopole radiator (11) are arranged at a distance (A); the at least two horizontally polarized radiators each comprise a Vivaldi antenna (5); the Vivaldi antennas (5) have a central and/or feeding surface (123), which forms a feeding plane (123′), in which an electrically conductive layer (27, 127) having slot lines (29′) that widen in a radiation direction is formed or provided, —the feeding plane (123′) is arranged at a distance (A) from the reflector (1); and the electrically conductive layer (27, 127) is led out of the feeding plane (123′), wherein at least one arcuate and/or bent extension (27a, 127a) is formed.

The present invention provides a waveguide slot array antenna having an excitation slot arrangement radiating a signal corresponding to an operating frequency in a radiation plate, the waveguide slot array antenna comprising: a first auxiliary radiation plate installed on a main radiation plate and rotating a polarization plane of a signal radiated from the excitation slot arrangement of the main radiation plate; and a second auxiliary radiation plate installed on the first auxiliary radiation plate and distributing and radiating the signal, the polarization plane of which has been rotated in the first auxiliary radiation plate.

A slot antenna device including a substrate, a metal layer and a feeding element is provided. The substrate has a first surface and a second surface opposite to the first surface. The metal layer is disposed on the first surface, and includes a slot extending along a first direction. The feeding element is disposed on the second surface, and extended along a second direction, where the first direction is perpendicular to the second direction. A length of the slot is a sum of each quarter wavelength of at least three frequency bands, so that the slot antenna device is operated at the at least three frequency bands. A projection of the feeding element on the first surface crosses the slot, so that the slot is divided into a first section and a second section, where a length of the first section is equal to a length of the second section.

An antenna of the present disclosure has a housing having a shallow cavity in a top of the housing and a shallow cavity in a bottom of the housing. The antenna further has a substantially circular radiating element disposed in the shallow cavity on the top of the housing, the radiating element having an are shape slot. In addition, the antenna has a substantially circular parasitic element disposed in the shallow cavity on the bottom of the housing.

This invention provides conformal antenna structures, how to make and use the antenna structures, and systems in which the antenna structures may be used for biometric sensing of humans and other animals. The antenna structures of the invention includes at least one relatively flexible section connecting relatively rigid sections. The relatively flexible section connecting relatively rigid sections may flex so that the relatively rigid sections connected to the relatively flexible section can change orientation relative to one another. This allows the relatively rigid sections to be conformed to a region of a surface of a human or animal that is not flat (that is curved).

A reflector structure is configured to connect an antenna. The antenna has an excitation source. The reflector structure includes a metal substrate, at least one first flat plate and a second flat plate. The metal substrate is configured to reflect the radiation of the antenna. The at least one first flat plate is disposed on the metal substrate. The second flat plate is floated to the metal substrate along a virtual normal and completely separated from the at least one first plate to form a closed slot. A cavity is formed by the metal substrate, the at least one first flat plate and the second flat plate and communicated with the closed slot. The excitation source is projected onto a plane to form an excitation source region. The excitation source region is located in the second flat plate.

As such, in the disclosure, a slit is formed in a side plate. The slit has an opening in the upper end surface of the side plate. The opening has a width which is smaller than a thickness of the side plate and enables to correspond to a thickness t of the substrate and a length which enables to correspond to a length a of one side of the substrate. An RF antenna module is housed in the slit formed in the side plate of the housing to be accommodated in the housing by inserting the one side of the substrate through the opening of the slit, which is formed in the upper end surface of the side plate, and inserting the substrate into the slit by an amount equal to or larger than a length of another side of the substrate.

A method includes receiving a series of radio frequency (RF) signals, where, from RF signal to RF signal of the series of RF signals, a carrier frequency is changed in accordance with a frequency hopping pattern. The method further includes, while receiving the series of RF signals, sensing an environmental condition by, for a frequency hop of at least some frequency hops of the frequency hopping pattern, adjusting a characteristic of a wireless sensor to maintain proximal alignment of a resonant frequency of the wireless sensor with the carrier frequency corresponding to a present frequency of the at least some frequency hops and generating a value to represent the adjustment of the characteristic, where a set of values is generated for the at least some frequency hops and where the set of values is used to determine a sensed value of the environmental condition.