Helmet Antenna Research Articles

Characteristics of Disaster Prevention Helmet Antenna Using Disk-loaded Monopole Antenna

Characteristics of Disaster Prevention Helmet Antenna Using Disk-loaded Monopole Antenna

High efficient dual band stacked antennas integrated into rescue helmets for indoor communication

AbstractA dual-band stacked antenna integrated with a rescue helmet is proposed for WLAN applications. The cross slot aperture feeding technique enables the antenna to support dual-band operation at 2.4 and 5 GHz. On the ground plane, two slots are formed, perpendicular to each other and of different lengths. Four dielectric layers of different permittivity are stacked over this cross slot to attain the desired frequency bands. Under free space condition, the radiator yields 7% (2.31–2.48 GHz), 15.87% (5.12–6 GHz) 10 dB return loss bandwidth (BW). The use of low loss dielectric layers on the slots also provides a high antenna efficiency and moderate gain at both frequency bands. The small dimension of antenna encourages its use as a wearable helmet antenna. Antenna performances are observed under wearable condition. For assessing human exposure to RF electromagnetic fields, SAR evaluations are conducted at both 2.4 and 5 GHz WLAN bands.

Coplanar waveguide fed stacked dielectric resonator antenna on safety helmet for rescue workers

AbstractThis paper presents the design of a compact dielectric resonator antenna for 2.4 GHz wireless local area network or industrial, scientific and medical (ISM) band applications. The antenna consists of four stacked layers of dielectric resonators along with a rigid structure of coplanar waveguide feed. The complete antenna is placed on a safety helmet conformably to develop a wearable system for rescue workers. The achieved −10 dB bandwidth at 2.4 GHz is 6.6% (2.33–2.49 GHz). The maximum gain achieved with this proposed dielectric resonator antenna is 3.74 dBi. “On head performance” of this proposed helmet antenna is also observed including human head model in the simulation.

Low-Profile Wideband Monopolar UHF Antennas for Integration Onto Vehicles and Helmets

A novel design of a low-profile wideband monopolar antenna is proposed with integration examples for vehicles and helmets. Initially, a monopolar antenna size is reduced by adding four symmetrical tapered slots on an edge-shorted patch. The antenna is first designed to be integrated onto a large flat ground plane that is applicable for vehicular installation. This design is later adapted for integration onto a helmet with a finite-curved ground plane, where the helmet material is included as part of the design. This study shows that a curved ground plane improves the radiation patterns at broadside and further reduces the antenna height. Both vehicle and helmet antennas have been optimized to operate in a wide frequency range from about 800–2300 MHz. These antennas radiate in a monopole-like pattern with vertical polarization and high radiation efficiency that makes them suitable for transmission applications. Good agreement between simulation and measurement is obtained, which ultimately validates the proposed design technique.