A Novel Low Loss and Miniaturized Triple-Band Bandpass Filter and Equal/Unequal Filtering Power Dividers Using Half-Mode Substrate Integrated Waveguide

A novel low-loss and miniaturized triple-band bandpass filter (BPF) and triple-band filtering power dividers (FPDs) with arbitrary power division ratio using half-mode substrate integrated waveguide (HMSIW) have been proposed in this article. The working mechanism of the introduced components is based on the evanescent-mode technique which is one of the most important techniques to reduce the dimension of the microwave structures. Other methods which are used in this work to miniaturize the total size of the proposed configurations are the half-mode technique, the stepped-impedance resonator (SIR) technique, and the meander technique. Accordingly, a triple-band BPF and three triple-band equal/unequal FPDs with the power division ratios of 1:1, 4:1, and 8:1 have been designed and simulated working at 2.35, 3.7, and 5.65 GHz using the mentioned techniques. Therefore, the total size of the proposed components is very small and is less than 0.01?(2)(g) . The designed triple-band BPF and triple-band FPD with equal power division ratio have been fabricated under the printed circuit boards (PCBs) process and measured to demonstrate the efficiency of the proposed designs. The simulation results show good agreement with the measurement results.