A three-dimensional (3-D) low-loss and wideband BPF based on low-temperature co-fired ceramic (LTCC) has been presented for 60 GHz wireless communication applications. For a low-loss and broad-bandwidth characteristics of the BPF, via pads as an additional resonator in the vertical via transitions are designed. The proposed BPF has been designed by investigating its characteristics as a function of dimensions of the resonators using a single-mode patch and via. The designed BPF was fabricated in a 6-layer LTCC dielectric. The fabricated BPF shows a centre frequency (fc) of 61.46 GHz and a 3dB fractional bandwidth of 10.5 % from 58.2 to 64.7 GHz (6.47 GHz). An insertion loss of −2.88 dB at fc and return losses below −10 dB are achieved. Its whole size is 4.72 × 1.7 × 0.684 mm3.
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