Antenna system

摘要

The present invention provides a non directional antenna system comprising an antenna casing movable between first and second positions with respect to a radio circuit main unit including a radio circuit, said antenna casing having a helical antenna operated when said antenna casing is located at said first position so that a major portion of said antenna casing is received in said radio circuit main unit, and a whip antenna to be operated when the antenna casing is located at said second position so that a major portion of said antenna casing is outside of the radio circuit main unit, said helical antenna an said whip antenna being electrically insulated from each other, and said whip antenna being designed to pass through said helical antenna, said helical antenna being positioned at one end of said antenna casing, said antenna casing having a first connecting unit for connecting said helical antenna to said radio circuit when said antenna casing is located at said first position, a second connecting unit for connecting said whip antenna to a ground plane when said antenna casing is located at said first position and third connecting unit for connecting said whip antenna to said radio circuit when said antenna casing is located at said second position, said second connecting unit being located directly below said first connecting unit, and said third connecting unit being located apart from said first and second connecting units such that said third connecting unit is close to other end of said antenna casing. The present invention provides a non directional antenna system comprising an antenna casing movable between first and second positions with respect to a radio circuit main unit including a radio circuit, said antenna casing having a helical antenna operated when said antenna casing is located at said first position so that a major portion of said antenna casing is received in said radio circuit main unit, and a whip antenna to be operated when the antenna casing is located at said second position so that a major portion of said antenna casing is outside of the radio circuit main unit, said helical antenna an said whip antenna being electrically insulated from each other, and said whip antenna being designed to pass through said helical antenna, said helical antenna being positioned at one end of said antenna casing, said antenna casing having a first connecting unit for connecting said helical antenna to said radio circuit when said antenna casing is located at said first position, a second connecting unit for connecting said whip antenna to a ground plane when said antenna casing is located at said first position and third connecting unit for connecting said whip antenna to said radio circuit when said antenna casing is located at said second position, said second connecting unit being located directly below said first connecting unit, and said third connecting unit being located apart from said first and second connecting units such that said third connecting unit is close to other end of said antenna casing.