New cross-coupled filter design using improved hairpin resonators

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Stopband-Extended Balanced Bandpass Filter Using Coupled Stepped-Impedance Resonators (2007, methodology): “is composed of four symmetric 2 SIRs which are similar to the ones adopted in [5].”
Tunable microstrip bandpass filters with two transmission zeros (2003, methodology): “The coupling between the two open ends of the resonators is simply expressed by the gap capacitance [ 3 ], [5].”
Design of Dual- and Triple-Passband Filters Using Alternately Cascaded Multiband Resonators (2006, background): “Therefore, many applications to planar filters such as parallel-and cross-coupled bandpass filters have been extensively used in microwave communication systems due to their high-practicality, high-performance , and simple synthesis procedures [2]–[6].”
Compact elliptic-function low-pass filters using microstrip stepped-impedance hairpin resonators (2003, methodology): “Conventionally, the behavior of the stepped-impendance hairpin resonator has been described by using even- and odd-mode and network models [2], [ 4 ].”
Performance of a planar filter using a 0/spl deg/ feed structure (2002, methodology): “The insertion loss is compared with the one of the original design with a non-0 feed structure in [ 3 ], and both are shown in Fig. 10(b).”