“…Miniaturization is achieved by using multiple modes of a resonator within the passband of the BPF as opposed to coupling multiple single-mode resonators. By either splitting or merging the frequencies of those modes, both multi-band BPFs [3], [4], [5], [6], [7], [8], [9], [10], [11], [12], [13] and single-band BPFs [14], [15], [16], [17], [18], [19], [20], [21], [22], [23], [24], [25], [26], [27], [28], [29] can be materialized. Furthermore, quasi-elliptic transfer functions can be realized with MMRs due to the presence of cross couplings between the modes or between the source and the load that result in transmission zeros (TZ) in the out-of-band response.…”