A Curtain Quad Antenna Array consists of 7 or more Half-Wavelength radiating Elements (Horizontal for TV), interconnected by (Vertical) feedlines, forming as many Rectangular Boxes as you have room for.
Includes 7-Element (CQ7) and 9-Element (CQ9) Arrays starting with the Classic CQ Rectangular shape. These are NOT the only usable dimensions. The overall size of the array can be Rescaled somewhat, varying the Height/Width Ratio (HW) to bring the Max Gain peak back to mid-Band. A (shorter, wider) CQ7 alignment was found, but the overall Gain was reduced by 2 dB. These alignments fix the box width at 30-inches, no Rescaling.
Snipping out the outermost Vertical parts of the CQ Rectangles actually improved Gain on all frequencies. The Center, Driven Element was shortened to improve SWR, at the expense of lower Max Gain (mid-Band). For CQ9, the Outer Horizontal Elements were also brought inward (like an Accordion) to improve Lo/Hi-Freq Gain, which also decreased the overall width of this (HUGE) array.
========================================================== Information re CQ can be found here: http://home.comcast.net/~ross_anderson/CurtainQuad.htm http://home.comcast.net/~ross_anderson/CurtainQuadTable.htm http://home.comcast.net/~ross_anderson/CurtainQuadFigure2.htm http://home.comcast.net/~ross_anderson/CurtainQuadFigure11.htm
Above are Horizontally Polarized. Fol. is Vertically Polarized, showing narrower Center Element to improve SWR: http://home.comcast.net/~ross_anderson/2400MHzAntenna.htm
Date(s): 5 August 2009. Album by holl_ands. 1 - 15 of 15 Total. 13357 Visits.
enlarge 26KB, 791x1024 13 Example 4nec2 File: Hi-VHF 7-El (2x3) Curtain Quad (CQ7-S) With & w/o Verticals on outer Rectangles SNIPPED.
enlarge 28KB, 791x1024 14 Example 4nec2 File: Hi-VHF 7-El (2x3) Curtain Quad (CQ7-SN) With Narrower Center Driven Element to improve SWR. With & w/o Verticals on outer Rectangles SNIPPED.
enlarge 28KB, 791x1024 15 Example 4nec2 File: Hi-VHF 9-El (3x3) Curtain Quad (CQ9-PNA) With Narrower Center Driven Element to improve SWR and outer Elements moved inward to improve Gain.
