Short, dual-driven groundless antennas are provided. One of the antennas includes a tubular outer conductor, a tubular inner conductor, and an electrical connector that electrically connects an opposite end of the outer conductor to the exterior of the inner conductor. The inner conductor is longitudinally disposed within the hollow axial interior of the outer conductor such that an axial gap exists between the radially inner surface of the outer conductor and the radially outer surface of the inner conductor, and the inner conductor runs at least to the opposite end of the outer conductor. Electrical signals are connected to a driven end of both the outer and inner conductors, where these signals supply power to/from the antenna whenever it is used as a transmitter/receiver, and neither of these signals needs to be connected to an electrical ground.

Short, dual-driven groundless antennas are provided. One of the antennas includes a tubular outer conductor, a tubular inner conductor, and an electrical connector that electrically connects an opposite end of the outer conductor to the exterior of the inner conductor. The inner conductor is longitudinally disposed within the hollow axial interior of the outer conductor such that an axial gap exists between the radially inner surface of the outer conductor and the radially outer surface of the inner conductor, and the inner conductor runs at least to the opposite end of the outer conductor. Electrical signals are connected to a driven end of both the outer and inner conductors, where these signals supply power to/from the antenna whenever it is used as a transmitter/receiver, and neither of these signals needs to be connected to an electrical ground.

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.

An instrument includes a housing that defines a handle for a user of the instrument, and a circuit disposed within the housing, the circuit being configured to implement wireless communications. The housing includes a conductive shaft. The circuit is electrically connected to the conductive shaft such that the conductive shaft is configured as an antenna element for the wireless communications or as a ground plane for the antenna element.

An instrument includes a housing that defines a handle for a user of the instrument, and a circuit disposed within the housing, the circuit being configured to implement wireless communications. The housing includes a conductive shaft. The circuit is electrically connected to the conductive shaft such that the conductive shaft is configured as an antenna element for the wireless communications or as a ground plane for the antenna element.

An RF antenna assembly may include first and second tubular conductors, a dielectric isolator, and first and second electrical contact sleeves respectively coupled between the first and second tubular conductors and the dielectric isolator. The RF antenna assembly may include an RF transmission line having an inner conductor and an outer conductor extending within the first tubular conductor, and a feed structure coupled to a distal end of the RF transmission line. The feed structure may include a first radially compressible connector coupled to the outer conductor of the RF transmission line to slidably engage adjacent portions of the first electrical contact sleeve, a second radially compressible connector coupled to the inner conductor of the RF transmission line to slidably engage adjacent portions of the second electrical contact sleeve, and a dielectric tube coupled between the first and second radially compressible connectors.

A dielectric loaded sleeve monopole antenna has a dielectric loading within the sleeve enables stable impedance in a dynamic operating environment. The use of a dielectric filling in the sleeve portion of the antenna enables tight control of the input impedance over frequency establishing stable broadband operation in challenging operating environments. The effective dielectric constant inside the sleeve of the antenna is designed to exhibit spatial variability. As a result, the sleeve essentially acts as an impedance transformer enhancing control over the input impedance to the antenna. The spatial variability in the dielectric filling may be realized as arrangements of single or multiple dielectric materials machined to synthesize the desired effective dielectric properties.

A dielectric loaded sleeve monopole antenna has a dielectric loading within the sleeve enables stable impedance in a dynamic operating environment. The use of a dielectric filling in the sleeve portion of the antenna enables tight control of the input impedance over frequency establishing stable broadband operation in challenging operating environments. The effective dielectric constant inside the sleeve of the antenna is designed to exhibit spatial variability. As a result, the sleeve essentially acts as an impedance transformer enhancing control over the input impedance to the antenna. The spatial variability in the dielectric filling may be realized as arrangements of single or multiple dielectric materials machined to synthesize the desired effective dielectric properties.

A dual band end fed dipole provides at least two distinct operating frequencies, e.g. 2.45 GHz and 5.5 GHz. Properties of the antenna include low cost to manufacture, e.g. ease of automation; minimal manual labor to manufacture, e.g. reliability; dual band operation; broad bandwidth; good feed line isolation; omnidirectional beam pattern; minimal vertical beam squint; small diameter; and high efficiency. Embodiments of the invention provide a dual band end fed dipole with a low band trap on the feed side that requires minimal manual labor to manufacture because the antenna is formed from a single flat sheet of metal and soldering is replaced with crimping. Minimal dielectric loading is also achieved.