Design of compact dual‐mode dual‐band filtering power divider with high selectivity

A new design method for a compact dual‐mode dual‐band filtering power divider is proposed. To achieve two transmission poles in both of the two passbands, the odd‐ and even‐mode resonant properties of the dual‐mode resonator are employed in the design. By symmetrically locating four dual‐mode resonators at both sides of the main transmission line and choosing the proper output topology, the introduced circuit can successfully realise the dual‐band power division and filtering selectivity property. Two resistors are utilised to achieve good in‐band isolation performance of the filtering power divider. For demonstration, a dual‐band filtering power divider with two passbands centred at 2.2 and 2.7 GHz was designed and measured. Simulated and measured results are provided which show a good agreement.