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Diplexer, Triplexer & Multiplexer Solutions

High performance arrays for demanding applications

In a complex RF spectrum, managing multiple bands through a shared path is critical when optimizing size, weight, and RF performance. RF diplexers, triplexers, and multiplexers are designed to separate discrete tones or bands with minimal interference. Utilizing a precision array of filters, diplexers, triplexers, and multiplexers are designed to allow transmitters or receivers to operate and manage multiple channels on a single antenna or transmission line.

Visit our filter customization tool to optimize your demanding diplexer and triplexer requirements. Our extensive library of low-loss designs can reduce the need for additional gain, supporting SWaP-constrained applications. Spectrum engineers apply innovative techniques to deliver high-performance solutions.

Diplexer_Graph.pngDiplexers

A passive RF filter that combines or separates two frequency bands through a common port.

Multiplexer_Triplexer_Graph.pngTriplexers

A passive RF filter that combines or separates three frequency bands through a common port.

Multiplexer_Triplexer_Graph.pngMultiplexers

A passive RF device that combines or separates multiple frequency bands through a common interface.

The core objective of any diplexer, triplexer, or multiplexer is isolation: to separate signals and isolate them in order to manipulate each waveform independently. A diplexer uses a three-port configuration to receive and then split the signal into two distinct paths, typically using a combination of high-pass and low-pass filters in the design. A triplexer incorporates additional bandpass filters and ports to manage three distinct frequency bands or tones, while a multiplexer extends this concept to support three, four, or even more channels.

At Spectrum Control, design focus is placed on achieving ultra-low insertion loss (0.1 dB) and steep rejection. This ensures that even in a crowded spectrum—such as Electronic Warfare, targeting platforms, defense radar, 5G, emerging 6G, and satellite communications—signal fidelity is maintained without cross-channel interference.