A helicoidal, mixed polarization mono-conical antenna has: a supporting structure (2) with a longitudinal axis (2a); ground conductors (3) connected to an area around a first portion (4) of the supporting structure (2) defining a ground plane (21) of the antenna (1) orthogonal to the axis (2a); at least three signal conductors (7), which have respective first ends (8) that are connected to a second portion (5) of the supporting structure (2) and respective second ends (10) that are connected to a third portion (6) of the supporting structure (2) located between the first portion (4) and the second portion (5) along the axis (2a), the conductors wound in a helicoidal manner relative to the axis (2a) and shaped so as to define a substantially frusto-conical volume (12) which is coaxial to the axis (2a) and is oriented with a smaller base towards the first portion (4).

A helicoidal, mixed polarization mono-conical antenna has: a supporting structure (2) with a longitudinal axis (2a); ground conductors (3) connected to an area around a first portion (4) of the supporting structure (2) defining a ground plane (21) of the antenna (1) orthogonal to the axis (2a); at least three signal conductors (7), which have respective first ends (8) that are connected to a second portion (5) of the supporting structure (2) and respective second ends (10) that are connected to a third portion (6) of the supporting structure (2) located between the first portion (4) and the second portion (5) along the axis (2a), the conductors wound in a helicoidal manner relative to the axis (2a) and shaped so as to define a substantially frusto-conical volume (12) which is coaxial to the axis (2a) and is oriented with a smaller base towards the first portion (4).

An antenna includes, a radiation conductor that is fed by one end, has another end serving as an opened end, and emits or receives radio waves, a first grounding conductor that is installed at the one end side of the radiation conductor and is grounded, a second grounding conductor that is electrically coupled with the first grounding conductor and is formed in a cylindrical shape around the radiation conductor with an elongation direction of the radiation conductor as an axial direction. At least one of the first grounding conductor and the second grounding conductor is electric-field coupled with a conductor where the antenna is installed.

An antenna may include a tower extending vertically upward from a ground location, a first set of elongate antenna elements extending outwardly from the tower at a first height above the ground location, and a second set of elongate antenna elements extending outwardly from the tower at a second height above the ground location and below the first height. In some embodiments, at least one elongate antenna element of the first and second sets of elongate antenna elements may be electrically coupled to the ground location. A radio frequency (RF) feed may be electrically coupled to the first and second sets of elongate antenna elements.

An antenna apparatus includes a ground plane having an edge; a monopole type first antenna element having a first feed point and configured to communicate at a first frequency; and a monopole type second antenna element having a second feed point and configured to communicate at a second frequency, the second antenna element extending from the second feed point in a direction away from the edge. An end portion of the first antenna element is arranged closer to the ground plane than an end portion of the second antenna element is. A length of an interval between the first feed point and the second feed point is in a range of from 0.25-fold to 0.7-fold of an electrical length of a first wavelength at the first frequency. A length of the second antenna element is a length in a range of from 0.15-fold to 0.55-fold of the electrical length.

An antenna apparatus includes a ground plane having an edge; a monopole type first antenna element having a first feed point and configured to communicate at a first frequency; and a monopole type second antenna element having a second feed point and configured to communicate at a second frequency, the second antenna element extending from the second feed point in a direction away from the edge. An end portion of the first antenna element is arranged closer to the ground plane than an end portion of the second antenna element is. A length of an interval between the first feed point and the second feed point is in a range of from 0.25-fold to 0.7-fold of an electrical length of a first wavelength at the first frequency. A length of the second antenna element is a length in a range of from 0.15-fold to 0.55-fold of the electrical length.

In-building antenna apparatus and methods for manufacturing and installing the same. In one embodiment, the antenna apparatus includes a radome cover, a lower flange, an antenna housing, a spring-loaded mount apparatus, a signaling interface, and a plurality of spring arms. Each of the spring arms may include at least one tie-down location. Accordingly, when a removable tie is placed around a plurality of tie-down locations, the antenna apparatus resides in an installation configuration; however, when the removable tie is removed from around the plurality of tie-down locations, the antenna apparatus transitions towards a default configuration. The spring arms may also act as a ground plane for the antenna. Spring-loaded mount apparatus as well as methods of manufacturing and installing the aforementioned antenna apparatus are also disclosed.

An oven appliance is provided that includes an antenna device for a wireless probe system. In one exemplary aspect, the antenna device includes features that allow the antenna device to function as an antenna for the wireless probe system as well as an oven cavity air temperature sensing device.

A two-wheeled motor vehicle having a main frame on which a metal structure is mounted, and first and second antennas, disposed outside the main frame in a vehicle width direction, for road-to-vehicle and vehicle-to-vehicle communications. The first and second antennas are opposite to each other and are separated by the metal structure of the main frame.

A two-wheeled motor vehicle having a main frame on which a metal structure is mounted, and first and second antennas, disposed outside the main frame in a vehicle width direction, for road-to-vehicle and vehicle-to-vehicle communications. The first and second antennas are opposite to each other and are separated by the metal structure of the main frame.