A Single Substrate Layer Low-Profile Complementary Antenna with Broadside Pattern

A single substrate layer, low-profile, complementary antenna with broadside pattern is proposed, which is composed of a novel low-profile helical magnetic dipole and a traditional bowtie electric dipole. The novel helical magnetic dipole is achieved by two symmetric W-shaped substrate-integrated helix antennas (WSHAs). The traditional bowtie electric dipole is composed of a pair of bowtie patches. The current distribution and radiation characteristics of the proposed magnetic and electric dipole are simulated to demonstrate their magnetic and electric source behaviors. By integrating the two dipoles orthogonally into the single substrate, a complementary antenna with low profile height of 0.032λ<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</inf> (λ<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</inf> is the free-space wavelength corresponding to the operating frequency <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$f_{l}$</tex>) is obtained. The simulated peak gain in the broadside direction is 3.6 dB, and the front-to-back ratios (FTBR) is 14.8 dB.