초록 ▼

The present invention features a dual mode, meander line loaded antenna (MLA) having an additional wideband plate or hat located above the horizontal top surface of the MLA antenna. The upper plate is spaced a predetermined distance above the MLA and held in place by dielectric blocks of a predeterm

The present invention features a dual mode, meander line loaded antenna (MLA) having an additional wideband plate or hat located above the horizontal top surface of the MLA antenna. The upper plate is spaced a predetermined distance above the MLA and held in place by dielectric blocks of a predetermined thickness. By properly spacing the additional plate, simultaneous wideband and narrowband reception can be performed. The added upper plate generally does not interfere with the usual narrowband operation of the original antenna structure. The modified antenna can accept radio frequency signals across a wide range of frequencies. The additional upper plate can be retrofitted to existing MLAs to modify them for dual mode operation.

대표청구항 ▼

1. A narrowband/wideband dual mode antenna comprising:a) meander line loaded antenna (MLA) comprising: a pair of vertical sections disposed substantially perpendicular to a ground plane, one of said pair of vertical sections being electrically connected to said ground plane; a substantially horizont

1. A narrowband/wideband dual mode antenna comprising:a) meander line loaded antenna (MLA) comprising: a pair of vertical sections disposed substantially perpendicular to a ground plane, one of said pair of vertical sections being electrically connected to said ground plane; a substantially horizontal top section disposed above and substantially perpendicular to said pair of vertical sections, each end of said top section being proximate one of said pair of vertical sections and separated therefrom by a gap; one or more meander line elements proximate at least one of said gaps and operatively connected to one of said vertical sections and to said top section; b) a wideband plate disposed a predetermined distance above and electrically isolated from said horizontal top section; and c) a feed means for accepting a voltage induced between said wideband plate and said top section by an incoming signal.