In the fast-moving world of space communications, Telemetry, Tracking, and Command (TT&C) systems form the central nervous system of satellite control—ensuring missions stay connected, tracked, and on course. At the heart of these systems lies a critical component: the TT&C diplexer.
UK-based Phase 2 Microwave Ltd has become a leading innovator in this space, developing TT&C diplexers that push the boundaries of performance, reliability, and miniaturization. With deep expertise in RF and microwave engineering, their solutions are powering satellite missions across the globe.
Headquartered in Stevenage, Hertfordshire, Phase 2 Microwave Ltd is an ISO9000-accredited engineering company known for crafting high-performance RF components including filters, diplexers, directional couplers, and custom subsystems. Their technology supports applications in satellite communications (flight and ground), high-power weather radars, and defense systems.
Beyond standard hardware, the company also delivers bespoke solutions for TVAC testing, payload PIM testing, and more—highlighting their adaptability and depth in the RF space.
A TT&C diplexer enables simultaneous transmission and reception over a shared antenna by separating uplink (command) and downlink (telemetry and tracking) frequencies. It is essential in:
– LEO, MEO, and GEO satellite systems
– Defense and aerospace platforms
– Scientific and Earth observation missions
Designing a space-grade diplexer requires meeting stringent demands:
– High isolation between transmit and receive bands
– Low insertion loss to maintain signal clarity
– Flexible architecture for single diplexer or dual Rx & Tx antenna setups
– Lightweight and compact design
– Space qualification for resistance to corona and multipaction
Phase 2 Microwave’s diplexer sits atop the satellite’s transponder unit—making shock and vibration resistance vital. In collaboration with Comdev International (now Honeywell), rigorous testing was conducted under conditions mimicking real launch forces.
Figure 1: TT&C diplexer mounted on Transponder Unit, courtesy of Comdev
One engineering challenge was the need to support full TT&C frequency bands (2025–2120 MHz uplink and 2200–2290 MHz downlink) without bloating the unit’s size or weight. The solution? A part-band diplexer using 50 MHz bandwidth per channel—optimized and tuned to customer-specific frequency plans at the time of ordering.
Figure 2: Typical Measured Performance of TT&C Diplexer (Single Antenna Format)
Attention to internal geometries ensures compliance with ESA’s ECCS standards for corona and multipaction immunity. The team now leverages Multiphysics simulation tools during development, further improving predictive design accuracy.
Over the past three years, Phase 2 Microwave’s approach is increasing being adopted across European and now US markets, with numerous Engineering Models (EM) and Flight Models (FM) delivered. Customers appreciate the dual filter / diplexer flexibility, and the company continues to tailor its designs to meet evolving requirements.
Phase 2 Microwave isn’t stopping at Earth orbit. The team is actively developing Deep Space Filtering solutions, signaling their commitment to supporting next-generation missions that will stretch further into the solar system.
Phase 2 Microwave’s TT&C diplexer exemplifies the innovation needed for modern space exploration. By collaborating closely with partners and continuing to invest in simulation tools to better meet the next-gen requirements,
The space missions’ grow in number and complexity of components like these will continue to form the invisible infrastructure enabling future advancements
Unit 1A, Boulton Road,
Pin Green Industrial Estate
Stevenage, SG1 4QX
Tel +44 (0) 1438 313502
Email techsales@phase2mw.co.uk
+44 (0)7436 140185