Novel Design of Printed Antenna Integrated with Bandpass Filter for C-band Applications

A novel configuration of filtering antenna for C-band applications is presented in this paper. An elliptical radiator based UWB monopole antenna is first investigated and then integrated to a wideband bandpass filter to achieve high frequency selectivity as well as compactness. The bandpass filter is constituted by stepped impedance stub loaded resonator for C-band applications. Aperture backed inter-digital coupled lines are used to feed the multiple-mode resonator of proposed bandpass filter. The proposed filtenna leaves out the necessity of cascading any additional $50 \Omega$ microstrip elements in between the developed antenna and filter, thus making the system smaller. The incorporation of planar antenna and the filter is carried out using FR4 substrate board with permittivity 4.4 and thickness 1.6 mm. The overall dimension of the wideband filtenna is obtained as $59 \times 42$ mm $^{2}$. Performance analysis of the UWB antenna, bandpass filter and their integrated structure has been carried out systematically in this paper. An in-depth agreement between simulated and measured results is discovered for the proposed configurations.