Design of Novel Filtenna for Wireless Applications

Abstract

 In this paper, a novel design based on a dual-mode ring resonator, the filtering balun,
feeding the printed dipole antenna, the filter balun antenna (FBA), is presented. One port on the structure
allows the signals to be phase-shifted 180 degrees from one unbalanced port to two balanced signals. The
suggested designs use a single dual-mode ring resonator to operate as both a filter and a balun at the same
time. Compact designs are achieved by applying feeding to the second layer. Another unique characteristic
of the filtering balun is its ability to alter, based on perturbation size, the phase error and magnitude
imbalance of the two balanced signals. With the use of the Advanced Design System (ADS) software,
numerous structures have been developed, modeled, and evaluated. To achieve the highest performance,
every section of the design is assessed and optimized. Because the substrate is a lossy type (FR4), the
realized transmission coefficients, which are poorer than expected ideal values, make the suggested design
a strong contender for narrow-band wireless applications. For S2,1 and S3,1, the signal is routed through
two vias and fed into a dipole antenna in the opposite phase by employing the zero iteration for filtering the
balun in the first layer to condense with the second layers. The antenna structure is a printed dipole antenna
operating at 2.4 GHz.