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74309d7132 This occurs when the wavelength of the signal travelling down the guide differs from the slot spacing. The first, at 70 mm from the base, the second at 90mm. The slotted waveguide has achieved most of its success when used in an omnidirectional role. 100mm x 50mm x 3mm Metric size tubing: use the same 161mm wavelength and dimensions as for the US designs, but offset the feed point 15mm from center line instead of 10mm to bring the resultant SWR closer to unity. Use nylon, aluminum or stainless steel screws and fasteners, as suits your preference, not normal (corrosive) ones. The first has 8 slots and is about 30 inches long. This is because there are severe limitations in the accuracy of measurements at microwave frequencies. Its directivity in this plane is extremely good. Either you dont bother about it, and just hose the antenna clean every year or so, or you use, and regularly replace, the protective tape. Since it was relatively easy for me to "build" structure after structure in the electromagnetic simulator, an understanding of the inter-dependance of each parameter came quite quickly.