An antenna includes a metal tube, a coaxial cable disposed along a central axis of the metal tube, and a variable-impedance transmission wire structure. A dielectric body and a metal part are arranged along an axial direction of the cable. The antenna makes the resulting structure stable and reliable, achieves miniaturization of a multi-band antenna and provides a sufficiently wide bandwidth for each frequency band. The antenna also realizes easy control of the radiation pattern and is convenient for practical applications.

An antenna includes a metal tube, a coaxial cable disposed along a central axis of the metal tube, and a variable-impedance transmission wire structure. A dielectric body and a metal part are arranged along an axial direction of the cable. The antenna makes the resulting structure stable and reliable, achieves miniaturization of a multi-band antenna and provides a sufficiently wide bandwidth for each frequency band. The antenna also realizes easy control of the radiation pattern and is convenient for practical applications.

A lightweight 2.4 GHZ antenna designed to be clipped onto a laptop computer or mobile device to extend the range of operation. The device consists of a tubular plastic frame upon which wire loops and a reflector are mounted and aimed toward the intended source of Wi-Fi signal. Radio-Frequency energy is transferred bidirectionally from the antenna to embedded antennas in the laptop computer or mobile device so no hardwired connection is necessary. Operation requires no power. The device can be scaled to 5 GHz Wi-Fi and other frequency bands including cellular.

A lightweight 2.4 GHZ antenna designed to be clipped onto a laptop computer or mobile device to extend the range of operation. The device consists of a tubular plastic frame upon which wire loops and a reflector are mounted and aimed toward the intended source of Wi-Fi signal. Radio-Frequency energy is transferred bidirectionally from the antenna to embedded antennas in the laptop computer or mobile device so no hardwired connection is necessary. Operation requires no power. The device can be scaled to 5 GHz Wi-Fi and other frequency bands including cellular.

A roadside apparatus according to the first aspect includes: a housing including an antenna mounting surface; an antenna connection terminal being provided on the antenna mounting surface, and supporting both a rod antenna and a planar antenna; and a circuit being housed in the housing, and being configured to perform road-to-vehicle communication via a connection antenna connected to the antenna connection terminal. An area of the antenna mounting surface is equal to or larger than an area of the planar antenna. An antenna selected out of the planar antenna and the rod antenna is connected as the connection antenna to the antenna connection terminal.

A roadside apparatus according to the first aspect includes: a housing including an antenna mounting surface; an antenna connection terminal being provided on the antenna mounting surface, and supporting both a rod antenna and a planar antenna; and a circuit being housed in the housing, and being configured to perform road-to-vehicle communication via a connection antenna connected to the antenna connection terminal. An area of the antenna mounting surface is equal to or larger than an area of the planar antenna. An antenna selected out of the planar antenna and the rod antenna is connected as the connection antenna to the antenna connection terminal.

A broadband antenna assembly including a coaxial cable, a lower limit radiating element, a higher limit radiating element, and a flexible outer sheath encasing the components of the assembly. The lower limit radiating element has a diameter greater than a diameter of an outer jacket of the coaxial cable, allowing the lower limit radiating element to surround the coaxial cable. The dipole formed by the lower limit radiating element is approximately of the wavelength of the lower limit operating frequency. To capture higher frequencies, the higher limit radiating element includes a dipole that is approximately 30% shorter than that of the lower limit radiating element, allowing the antenna assembly to capture a wider bandwidth. By providing the radiating elements together with the coaxial cable, the antenna assembly removes the need for adapters and separately-connected component parts while providing a flexible outer sheath, improving mobile broadcasting applications.

An additively manufactured antenna device is disclosed, including a base portion and a body portion. The body portion is attached to the base portion and includes a lattice stiffening structure configured to eliminate secondary printing support.

A communication system includes an antenna assembly and a housing holding the antenna assembly. The antenna assembly has an antenna element having a substrate and a dual dipole antenna circuit including a low-band ground terminal, a low-band feed terminal, a high-band ground terminal and a high-band feed terminal and a transmission line electrically connected to the dual dipole antenna circuit. The housing includes an upper shell and a lower shell meeting at an interface having upper and lower strain relief components at the interface to receive the transmission line. The upper shell has an upper locating feature and the lower shell has a lower locating feature interfacing to locate the upper shell relative to the lower shell.

A communication system includes an antenna assembly and a housing holding the antenna assembly. The antenna assembly has an antenna element having a substrate and a dual dipole antenna circuit including a low-band ground terminal, a low-band feed terminal, a high-band ground terminal and a high-band feed terminal and a transmission line electrically connected to the dual dipole antenna circuit. The housing includes an upper shell and a lower shell meeting at an interface having upper and lower strain relief components at the interface to receive the transmission line. The upper shell has an upper locating feature and the lower shell has a lower locating feature interfacing to locate the upper shell relative to the lower shell.