Comb-Shaped Patch Antenna Design Study with Shifted Arms and Asymmetric Architecture Enabling Controlled Resonance Change and Radiation Pattern
Özet
This paper reports comb-shaped patch antennas
with asymmetrical geometries having two and three arms on
the sides. The proposed geometry is evolved from regular
rectangular shaped patch antenna by removing certain parts of
the radiator patch and shifting the arms on one side of the
antenna. Systematic simulations were obtained with the
designed antennas for different arm shifting distances, and
changes in resonance behavior and far-field radiation pattern
were investigated. Results show that as the arm shifting
increases the first and second resonance frequencies of the
antennas decrease. Also, it is observed that the radiation occurs
with two symmetric beams at the second resonance frequency
of the designed antennas with no shift between the arms.
However, as the arm shifting is applied the beam on the side of
the arms closer to the feeding line gets stronger, whereas the
other beam weakens. Obtained plots indicate that the
directivity of the antennas have a tendency to increase with the
arm shifting while the side lobe level decreases. In addition,
results show that the half power beam width of the antenna
increases with arm shifting. The simulations were repeated for
different arm thicknesses and the same observations were held.
