Antenna adapter-vane. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Antennas. Measurements, adjustment, coordination
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The material brought to the attention of readers is an organic continuation of the article [1]. Today, manufacturers not only keep up with the urgent needs of buyers, but also stimulate new acquisitions by imposing their products with annoying advertising. All sorts of radio devices are now crowded not only with supermarkets, but also with our apartments. In view of the fact that these radio-electronic wealth should not lie idle like timeless traditional values, their owners are increasingly thinking about the joint "life" of these devices in apartments and offices and the impact of the electromagnetic fields they create on users. In this regard, it is not without interest that the round-the-clock use of wireless Wi-Fi networks operating at the same frequencies as daily, but briefly turned on microwave ovens.
In general, there are problems of electromagnetic compatibility of radio-electronic devices located in dwellings, and the permissible effect of electromagnetic radiation on people. In many ways, they are solved by the redistribution of electromagnetic energy in space during radiation and the increased directivity of the reception of electromagnetic waves. This requires a transition in home Wi-Fi networks from omnidirectional antennas to antennas. 2 with narrow radiation patterns, radiating only towards the network subscriber. Some amateur radio developments in this direction are discussed in the book [2]. Antenna adapters, previously discussed in [1], can also play a role.
Noteworthy is the sketch shown in Fig. 1 Wi-Fi antenna adapter - "vane", containing a system of passive vibrators with a device for attaching a nozzle to an omnidirectional antenna [3]. It is made in the form of a flat nozzle on the active antenna vibrator and is fixed on it due to the elasticity of the strips of the adapter dielectric substrate separated in different directions, separated in different directions and covering the vibrator. "Flyugarka" can be rotated around the axis of the vibrator and moved along it.
Rice. 1. Sketch of the antenna adapter-"wind vane"
The adapter reflector is a combination of loop and triangular elements with a direct cross connection, similar to that used in the device described in [4]. The length of the wire from which the reflector is made is equal to λWed. The loop element of the reflector is placed on the "wind vane" at a distance of λWed/4 from the axis of the active vibrator. On the other side of the axis at a distance λWed/8 placed a director with a length slightly less than λWed/ 2.
This structure is characterized by radiation patterns and electrical parameters shown in fig. 2. It is suitable for making by untrained users. Qualified radio amateurs can improve it.
Rice. 2. Radiation patterns and electrical parameters
On fig. 3 is a 1:1 scale drawing of the dielectric substrate of the adapter. To make it, copy the design onto thicker paper or thin cardboard and cut out the backing along the outline. Make a reflector and a director from an uninsulated or varnished wire with a diameter of 0,1 ... 0,2 mm, laying it along the red lines and securing it, for example, with adhesive tape. You can also flash the substrate with a wire, transferring it from one side to the other, as is done with ordinary sewing. The ends of the reflector wire should be soldered without breaking the symmetry in the center of the base of the triangle or in the center of the loop element. The sloping sections of the wire must not touch at the point of intersection.
Rice. 3. Scan of the dielectric substrate of the adapter on a scale of 1:1
After completing the wiring, fold the substrate along the dashed fold lines so that the part with the vibrators is inside. After eliminating the defects and smoothing the folds, unfold the resulting structure again, apply any paper glue on its inner surface, fold it again and place it under the load until the glue is completely dry.
After drying, use a sharp knife to make cuts in the adapter along the lines on the reamer. Spread the pieces of paper between the slots in different directions and put the adapter on the active antenna vibrator. In the photograph of Fig. 4 shows the appearance of the antenna with three adapters. To improve communication in specific directions, they can be directed in different directions.
Rice. 4. Appearance of the antenna with three adapters
Literature
- Kalitenkov N., Lebedev V., Milkin V., Shulzhenko A. Antenna adapter for improving the efficiency of wireless networks. - Radio, 2015, No. 1, p. 34-36.
- Massorin V. How to assemble antennas for communication, television, Wi-Fi with your own hands. - S.-Pb.: Science and technology, 2011.
- Milkin V., Kalitenkov N., Lebedev V., Shulzhenko A. Wi-Fi Antenna Adapter - “Flyer Vane”. - Application for utility model No. 2015106151 dated February 24.02.2015, XNUMX.
- Milkin V., Kalitenkov N., Lebedev V., Shulzhenko A. Shortened VHF antenna. - Radio, 2015, No. 7, p. 59-63.
Authors: N. Kalitenkov, V. Lebedev, V. Milkin, A. Shulzhenko
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