Channelized log-periodic antenna with matched coupling
View Patent ↗A log-periodic antenna coupled to a channelizer is described in which matched scale constants for the antenna and the channelizer are used to achieve substantially identical coupling over each fractional bandwidth channel. Embodiments for simultaneous dual polarization operation are described as well as embodiments suited for planar lithographic fabrication.
1. A combination of log-periodic antenna and log-periodic channelizer, wherein said combination comprises a planar log-periodic antenna electrically coupled through one or more taperline baluns to at least one log-periodic channelizer separate from said log-periodic antenna and located on the same substrate as said log-periodic antenna, and wherein said at least one log-periodic channelizer is a multi-port circuit including a series of diplexers and channel-defining filters of substantially equal electrical length, and wherein the size scale factor of adjacent conductors of said log-periodic antenna is substantially the same as the scale factor between center frequencies of adjacent channels of said at least one log-periodic channelizer, and whereby said coupling is substantially identical between each fractional bandwidth channel of said at least one log-periodic channelizer and said log-periodic antenna.
2. A combination as in claim 1 wherein said log-periodic antenna is a dual polarization antenna having components thereof disposed on opposite faces of a dielectric layer.