This small footprint diplxer is designed for the DC-2000MHz band. It features Lowpass rejections of 60 dB minimum from 1200 - 2000 MHz and highpass rejections of 60 dB minimum from DC - 800 MHz.
Developed for point-to-point radio and base-station link applications, a 38-GHz diplexer features a 37018 to 37658 MHz low pass band

MtronPTI offers the UFDX9999-002 C-band cavity diplexer/splitter assembly designed to support rugged, high-performance communication links that require full duplex operation in airborne, land, maritime, and deep space applications.

Continental Microwave offers a comprehensive line of filters, diplexers and multiplexers from 400 MHz to 50 GHz. A broad range of custom waveguide and coaxial designs are available offering extreme temperature stability and low insertion loss for data links, military satellite communications, missiles and radar applications
Features: Low Profile, Surface Mountable, Withstands Reflow Temperatures
Multilayer Diplexer (DPX205950DT-9008A1)by Digi-Key.
Anatech provides ceramic and cavity filters for INMARSAT communication applications
Our 1905-1910/1985-1900 MHz Cavity Duplexer covering a 10 MHz Bandwidth in the PCS bands provides a low insertion loss of 1.4dB max, and isolation of 30dB min. The Duplexer is typically used in PCS base stations, sub-systems, and can be tuned to different center frequencies within the PCS band.