Low-Profile Proximity-Coupled Cavity-Less Magneto-Electric Dipole Antenna

Area of Science:

• Electromagnetics and Applied Electrophysics
• Antenna Theory and Design

Background:

• Magneto-electric dipole (ME-dipole) antennas offer advantages like wide bandwidth and high gain for wireless systems.
• Conventional ME-dipole antennas have a significant thickness (0.25λo), limiting their use in portable devices.

Purpose of the Study:

• To introduce a new feeding method for ME-dipole antennas.
• To reduce antenna profile and ground plane size while preserving performance.
• To achieve a thinner antenna design suitable for mobile applications.

Main Methods:

• A cavity-less ME-dipole antenna design was developed.
• A suspended horizontal line was used for proximity coupling excitation.
• Antenna performance was measured and analyzed.

Main Results:

• Achieved a wide impedance bandwidth of 45.3% (2.05–3.25 GHz).
• Obtained an average in-band gain of 9 dBi with stable ±1 dBi variation.
• Reduced overall antenna thickness to 0.17λo.
• Utilized a ground reflector of approximately 0.89λo².

Conclusions:

• The proposed feeding method effectively reduces ME-dipole antenna thickness.
• The cavity-less design maintains desirable antenna characteristics like wide bandwidth and high gain.
• This innovation is highly suitable for compact portable wireless communication devices.