Reconfigurable axial-mode helical antenna

Details Reconfigurable axial-mode helical antenna Reconfigurable axial-mode helical antenna

H - Electricity

01

Q

H01Q 11/08 (2006.01) H01Q 3/32 (2006.01)

Patent

CA 2724370

Novel reconfigurable antennas are provided which may be used to accommodate the requirements for wideband multi-standard handheld communication devices. It is shown that using a shape memory alloy spring actuator, the height of a helical antenna and therefore the pitch spacing and angle can be varied. This can in turn tune the far-field radiation pattern and gain of the antenna dynamically to adjust to new operating conditions. The radiation pattern can further be directed using a two-helix array. Finally, a helical antenna embodiment is implemented and measured using a shape memory alloy actuator. Measurement results confirm that while keeping the centre frequency constant, gain tunability can be attained using this structure.

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