Abstract
A magnetoelectric antenna (MEA) that uses coplanar waveguide (CPW)-to-parallel-strip-line transition as feed to obtain a wide bandwidth is presented for millimeter-wave (mm-wave) bands. The balanced feed is utilized to feed a modified magnetoelectric dipole. The modified structure consists of a simple two-metal-strips MEA loaded with metallic loops. The resonant modes study shows that a new resonant mode is contributed by the loop when the loop length is nearly a wavelength, thereby improving the impedance bandwidth (IBW) and realized gain. A prototype is fabricated in-house with printed circuit board technology. Measured results validate a fractional IBW (VSWR <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$\leq$</tex-math></inline-formula> 2) of 75.76% with realized gain being 8.6 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$\pm$</tex-math></inline-formula> 1.8 dBi for 14–29 GHz. The radiation pattern measurements indicate a stable radiation pattern across the band with low broadside cross-polarization levels in both E- and H- planes. The simulated total efficiency is 86–96%.
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