MANHOLE COVER ANTENNA EQUIPMENT AND COMMUNICATION SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a manhole cover antenna capable of providing an antenna function for a manhole cover without deteriorating cover strength only by simply machining the manhole cover. SOLUTION: The surface of the manhole cover 1 is slightly cut to form a through hole 1b for putting a power feed line through in a center of the cut and recessed part 1a to install a substrate antenna 2 in the part 1a. A base conductor plate 2c on the rear surface of the antenna 2 is brought into contact with the cover 1 to short-circuit. Through the use of the thin substrate antenna 2 as an antenna element, the machining work of the part 1a for arranging the antenna element is minimized and as only the hole 1b for inserting a cable 2d and a connector 2e is provided, the strength of the cover 1 is not deteriorated much.