| Abstract [eng] |
The increasing global demand for high-speed and low-latency internet connectivity drives the development of reliable and reconfigurable satellite communication systems. Among these systems, Low Earth Orbit (LEO) satellites play a crucial role in expanding communication capabilities. These LEO satellites rely on Software Defined Radio (SDR) technology, which fundamentally depends on reconfigurable devices. RF filters are critical components of the SDR receiver. Traditional technologies fail to meet both tuning and integration requirements. This situation motivates the need for this work: to develop a high-quality, compact, and integrated tunable bandpass filter that covers both K and Q bands simultaneously. The aim of this work is to explore the feasibility of implementing a multiband tunable bandpass filter for emerging SDR communication systems, ensuring compliance with LEO operational standards. The technical objectives include low insertion loss, high integration, and coverage of the K and Q frequency bands. Additionally, the designed device aims to support a narrow 3 dB bandwidth and ensure high out-of-band signal attenuation. The methodology used to achieve the set goal included the design and simulation of the filter schematic. The insertion losses in each filter bank determined the gain value target for the amplifiers, and based on this, single and dual-stage amplifiers were designed for the K and Q bands, respectively. Upon achieving the desired results in the schematic design phase, validation proceeded to layout simulation. The results revealed maximum deviation in the out-of-band performance, while in-band performance remained stable. Finally, the results were compared with data available in the scientific literature, concluding that the filter is competitive in its technical parameters, occupies a smaller chip area, and covers two bands simultaneously. This makes this work significant in the field of electronics engineering, as such a solution has not been previously reported. |
