عباس رضایی

This work presents a novel microstrip dualband bandpass filter (BPF) using meandros spirals and patch cells, which is proposed for the 1st time by this work. It occupies a very compact size of 0.0017 λg2. The proposed filter is designed to operate at Fo1 = 0.85 GHz and Fo2 = 1.85 GHz for Global System for Mobile Communication (GSM)-850/ GSM-1900 applications. In addition to the small size, it has several advantages in terms of wide fractional bandwidths, low insertion losses, and high return losses at both channels. The simulated insertion losses at the lower and upper passbands are 0.05 dB and 0.1 dB, respectively. Another advantage of the proposed BPF of this work is the attenuated harmonics, where it is able to suppress the 1st, 2nd, 3rd, and 4th harmonics (4.11 Fo1) with −20 dB maximum harmonic level.