How can one develop a bandpass filter that will function in your RF applications that have high signal levels? The key to succeeding is effectively developing good specifications for the product. For instance take the Keenlion 4-8 GHz Band Pass Filter, which has a passband ranging from 4 GHz through 8 GHz, an insertion loss of less than or equal to 1 dB, and an input VSWR less than or equal to 2.0:1. These parameters will result in the lowest possible signal loss, and will assure that you will have the best possible matching by minimizing these two factors. The Keenlion 4-8 GHz band pass filter is made of oxygen-free copper with a natural finish, and comes with SMA-Female and SMA-Male connectors. It is rated to withstand up to 10 watts of power. The temperature range of operation is -35°C to +70°C, and the measurement tolerance is ±0.5mm..