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An electrically small and low-profile meander-line antenna using a capacitive feed structure is presented. The meander line has a length of one quarter-wavelength with a shorted end, and the capacitive feed structure is installed at the other end. A back conductor, which works as a ground plane, is located at a distance of 0.01λ0 to the meander-line element forming in the area of 0.121λ0 × 0.075λ0, which satisfies the condition of electrically small antennas (ka = 0.435 <; 0.5, wavenumber k, radius a of a sphere surrounding the antenna, and wavelength λ0 at the resonance frequency). The fabricated antenna has successfully achieved a peak gain of 0.62 dBi and exhibits a higher radiation efficiency of more than 30% compared to an inverted-F antenna of the same dimension.
Antennas and Wireless Propagation Letters, IEEE (Volume:11 )
Date of Publication: 2012