A New Method of Isolation Enhancement of Dual Band Band-Pass Filter Using Composite Mode Co-planar Waveguide Structure for 5G and Body Centric Applications

Frequency ratio or frequency difference of more than fifteen times between the two bands is difficult to realize particularly for millimetre-wave applications. This paper presents a large frequency ratio dual band band-pass filter for 5G communication and body-centric applications. The proposed filter has been studied and developed based on the mode-composite co-planar waveguide (MC-CPW). The proposed dual band band-pass filter comprises lower and higher bands designed independently with a high degree of freedom. In order to suppress the harmonics between the two bands, the lowpass filter is cascaded with the structure impedance matching to achieve the competent dual band band-pass filter response. The characteristics of the proposed dual band band-pass filter based on mode composite co-planar waveguide structure yield it as the promising and potential entrant for the multi-band operating systems particularly in 5G communication systems with body-centric applications. To certify the practicability and pre-eminence of the proposed filter, the simulated and measured results are compared and are found in good agreement with one another.