Traveling wave tubes (TWTs) utilize vacuum electronic technology as high-power microwave amplifiers. A higher linearity enables the use of more affordable and compact power supplies. Additionally, high-efficiency Travelling wave tubes have a longer lifespan and can function more dependably [1]. They are extensively utilized in communication satellite transponders as high-power radiofrequency amplifiers [6]. Having over 58 TWTs across various bands of frequencies, it is a typical-sized communication satellite. On a typical-sized communication satellite, frequencies like C-band (3.6–4.3 GHz), Ku-band (10.9–11.75 GHz), and Ka-band (20.6–21.3 GHz), are present [8]. The most expensive and crucial parts of a satellite are the TWTs. TWTs are primarily responsible for determining a communication satellite’s life and performance. A space TWT’s Wide bandwidth of the user, good linearity, efficiency, and gain are highly desired qualities for communication satellites handling a variety of downlink signals [7]. When designing and developing space TWT, extra care must be taken to provide high linearity, high adaptability, high efficiency, and long life. Important requirements for a space Travelling Wave Tube (TWT) used in communication are achieving a high efficiency of over 29% and keeping the phase shift at or below 28° while preserving a high level of linearity. A space TWT’s non-linearity is usually assessed using metrics like the noise-power ratio (NPR), multi-signal intercept points, carrier-to-intermodulation level (C/3IM), and 1 dB point of compression [11]. To obtain improved linearity and good efficiency, a space TWT (travelling wave tube) will be designed, developed and presented in this work.