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RF Window Size
My antenna theory knowledge is a little weak so I thought you guys
might be able to help. Background: I have a shed about 50 feet away from my house that contains water pumps and similar equipment that I monitor. The shed has no windows but was built using normal stud-wall construction. I built a small device that receives information from sensors and then reports back to my PC via my home network. I have no way to run wires to the shed because there is a driveway in between, so I decided to use wi-fi. The shed had a good strong wi-fi signal inside it and everything worked well for the last 5 years. Recently, vinyl siding was added to the shed. The installers used foil coated styrofoam insulation under the siding. The shed has changed from being fairly transparent to RF to being a somewhat leaky faraday shield. The wifi module still works, but just barely. There are lots of missed messages and any interference from devices like the microwave oven in the house shut down communications. Question: I want to create an RF "window" in the shed wall. How big does it need to be to let 2400 MHz signals pass through it? A full wavelength? Half wavelength? Should it be rectangular or would a vertical slot work? Opening the shed door (a full size metal door) temporarily restores a strong signal, but I was hoping a much smaller opening would work equally well. For aesthetic reasons, I can't experiment by cutting various size holes. What's the smallest hole I can cut in the foil coated insulation and be reasonably assured it will work? Thanks, Pat |
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