Download PDF: August 22, 2004 This article is a follow on to a previous article titled “Modeling Multi Band Cubical Quad Antennas with EZNEC and MATLAB”. The five band quad described in the previous article was rescaled by +0.7285% on the 17 Mtr section, +0.4409% on the 12 Mtr section, and +0.3514% on the 10 Mtr section to satisfy array performance parameter (i.e.

• Quad Antenna Design

Gain, FB, FBR, and SWR) trade offs as I saw them. The MATLAB program description of the adjusted five band quad design parameters follows. (SEE PDF FOR REST OF ARTICLE).

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Download PDF: This document describes the detailed construction and measured SWR versus frequency performance of my five band cubical quad. The quad is constructed on a 30 foot long 3 inch diameter aluminum boom. The spacing between the four major quad spiders is 10 foot for the 20, 17, 15, and 12 MTR bands. An extra fifth quad spider is added to the boom for the 10 MTR driven element such that equal 5 foot spacing to the 10 MTR reflector and first director results. I used Cubex spiders and 13 foot single piece white fiberglass poles in the construction. Star plus serials. The poles were covered with two coats of UV resistant gray paint to protect the resin in the poles from deterioration in the sun.

Quad Antenna Design

Antenna Software From QRZ. Cubical Quad Antenna Calculator -- From KD6DKS. EMMCAP Software for modeling of arbitrarily shaped wire structures and the computation of their electromagnetic behavior, including radiation and scattering problems. EZNEC 3.0 -- For for Windows 95/98/NT/200. Grating Solver Development Company - Antenna Solver V1.1a. Magnetic loop antenna calculator and loop antenna design program for windows let you calculate dimensions for magnetic loops antennas, in german N3DNO's Antenna calculator A 3 element yagi antenna calculator that uses javascript by N3DNO.

A MATLAB computer program named qdim.m was written to describe exactly where to drill the arm wire holes and where to mark the wires for cut points, solder points, measurement points, and arm hole points. Figures A and B show the point number nomenclature used in the computer output to mark driven and parasitic quad wires.

The dimensions are based on diamond shaped quad elements with driven elements fed at the bottom of the diamond. The dimensions of the parasitic quad elements could also be used for square quad elements. I used #12 hard drawn bare copper wire for all elements. The key to getting 10 year life out of the wires is to prevent wire contact with the fiberglass. If the wire is run through the fiberglass holes expect only a five year life since the fiberglass will rub a notch in the wire and it will break. One inch diameter Delrin rod drilled, epoxyed, and cotter pinned to the arm tips was used to prevent 20 meter wire contact with the fiberglass. A Delrin cylindrical sleeve was cotter pinned to the fiberglass to prevent 17 MTR wire contact with the fiberglass.