Waveguide Transmission System
Original Publication Date: 1986-Dec-01
Included in the Prior Art Database: 2005-Mar-09
In large air-conditioned buildings, the room temperature is usually kept at a selected value. For this purpose, temperature sensors must be installed in the rooms and electrical signals transmitted to the central air heating system. This article proposes that air ducts be used to transmit the electrical control signals. If a sufficiently high frequency is chosen for signal transmission, the air ducts will act as waveguides. The transmission frequency depends on the dimensions of and the terminations employed for the air ducts. Grids with holes, preventing unwanted radiation but permitting the air to pass, are generally used as terminations. Transmitters and receivers can be readily coupled to the air ducts.