RADIO-ELECTRONIC UNIT Russian patent published in 2002 - IPC

FIELD: radio electronics; receiving and processing signals arriving from satellite radio navigation systems. SUBSTANCE: small-sized radio-electronic unit built on single multilayer printed-circuit board has its printed-circuit board provided with six conducting layers; external layers carry printed-circuit conductors as well as electrical and radio components and internal layers accommodate conductors as well as bonded ground and power supply planes; interlayer connections are effected through metallized holes. Electrical and radio components and conductors are grouped in three sequential zones first one being used for analog conversion of satellite radio navigation system signals, second zone, for analog-to-digital conversion, and third zone, for digital conversion. Second layer has ground planes of all zones and third layer incorporates conductors for feeding first and second zones as well as additional conductors of third zone; fourth layer includes additional conductors of first and second zones and power supply plane of third zone; fifth layer has ground plane of first zone and additional conductors of second and third zones. Ground planes of second layer are interconnected by means of straight ground conductors arranged in accordance with location of signal conductors affording electrical communications among zones in external layers. First zone is surrounded over perimeter with shielding conductors arranged in opposition to each other in external layers. Shielding conductors of both external layers are coupled together and with ground planes of first zone (in second and fifth layers) be means of respective metallized holes. Shielding conductors have splits to pass signal conductors; non-split bonded sections of ground planes in second and fifth layers correspond to split sections. EFFECT: provision for eliminating stray pickups and induced noise unit implementing receiver-processor functions of satellite system. 5 cl, 9 dwg