Low-Profile CPW-PS-Fed Magnetoelectric Antenna

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
$\leq$
2) of 75.76% with realized gain being 8.6
$\pm$
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%.