ISM band pass filters for low-cost realization of mobile communication apparatus

The low-cost realization of ISM Band Pass Filters (BPFs) using integrated combline structures has been demonstrated. For the low-cost realization and mass-production, efforts have been concentrated into realizing the combline filter structures as an integrated conductor layer of FR4/epoxy based multi-layer substrates which are widely utilized as multilayer printed circuit boards (PCB) instead of ceramic. This filter is useful for the wireless network devices of ISM band (2.4 GHz) as Bluetooth and wireless LAN.