LTCC Diplexers Johanson Technology LTCC Diplexers offer passive RF signal split-and-filter solutions for cellular, ISM, Wi-Fi®, and WLAN applications in standard EIA SMD packages. These diplexers also feature multiple filtering schemes for the signal filtering portion to meet the user's emission, sensitivity, and isolation needs. Johanson Technology LTCC Diplexers have an operating temperature range of -40°C to +85°C.