Abstract: In this paper, a 5-bit octave true time delay (TTD) module is proposed. On a basis of vertical transition structure (VTS), wideband delay line fabricated on multilayer printed circuit board (PCB) can be realized. In addition, utilization of strip line as the delay circuit, we have obtained an ultra-band delay line. Moreover, wideband phase/ amplitude compensation circuits are employed for better performance. Meanwhile, supply converter, logical control, modulation drive and front-end RF circuits are mounted on temperature co-fire ceramic (LTCC). According to the measured results, amplitude fluctuation is better than ±0.5dB, and time-delay phase accuracy is within ±5°, while time-delay amplitude accuracy is within ±0.5dB in band.