Slot dipole antenna
A waveguide slot antenna has a vertical row of slots along the length of a vertical the polarization is horizontal — a comparable dipole antenna would be a. In radio and telecommunications a dipole antenna or doublet is the simplest and most widely used class of antenna. The dipole is any one of a class of antennas. Radar Basics. Basics. Slot Antenna. Slot radiators or slot antennas are antennas that are used in the frequency If this dipole is replaced by a slot antenna.
When the plate is driven as an antenna by a driving frequency, the slot radiates electromagnetic waves in a way similar to a dipole antenna. Quadrant antennas are notable in that they can be used to make horizontally polarized antennas with near- omnidirectional radiation patterns. Analysis of the Slot Antenna To see this material presented another way, here is a video on the analysis of the slot antenna. The antenna radiates a narrow vertical fan-shaped beam of microwaves. Suppose the length of the dipole is He invented it in order to produce a practical type of antenna for VHF television broadcasting that would have horizontal polarization, an omnidirectional horizontal radiation pattern and a narrow vertical radiation pattern. If this dipole is replaced by a slot antenna, in this case don't appear these disadvantages.
Antenna Theory - Slot
Slot Antenna is an example of Aperture antenna. A rectangular slot is made on the conducting sheet. These slot antennas can be formed by simply making a cut on the surface, where they are mounted on. Let us have a look at the structure of a slot antenna. When an infinite conducting sheet is made a rectangular cut and the fields are excited in the aperture which is called as a slot , it is termed as Slot antenna.
This can be understood by observing the image of a slot antenna. The following image shows the model of a Slot antenna. This concept gives an introduction to the slot antennas. The above images clearly explain the principle. The light does not pass through the opaque area, but passes through the aperture.
The light does not pass through the plane but through the remaining portion. The screen is not placed to observe the resultant combination. The effect of screen gets nullified. Working of Slot Antenna This principle of optics is applied to electromagnetic waves for the wave to get radiated. It is true that when a HF field exists across a narrow slot in a conducting plane, the energy is radiated. The image shows a slot antenna, which explains well about its working. Consider an infinite plane conducting screen is taken and pierced with apertures of desired shape and size and this will be the screen of slot antenna.
Another screen is considered interchanging the places of aperture and screen area which is the complementary screen. These two screens are said to be complementary as they result in complete infinte metal screen. Now, this becomes the slot antenna.
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The slot antenna is popular because they can be cut out of whatever surface they are to be mounted on, and have radiation patterns that are roughly omnidirectional similar to a linear wire antenna, as we'll see. The polarization of the slot antenna is linear.
The slot size, shape and what is behind it the cavity offer design variables that can be used to tune performance. Consider an infinite conducting sheet, with a rectangular slot cut out of dimensions a and b, as shown in Figure 1.
If we can excite some reasonable fields in the slot often called the aperture , we have a slot antenna. Rectangular Slot antenna with dimensions a and b. To gain an intuition about slot antennas, first we'll learn Babinet's principle put into antenna terms by H. This principle relates the radiated fields and impedance of an aperture or slot antenna to that of the field of its dual antenna. The dual of a slot antenna would be if the conductive material and air were interchanged - that is, the slot antenna became a metal slab in space.
An example of dual antennas is shown in Figure 2: Dual antennas - left the slot antenna, right the dipole antenna. Note that a voltage source is applied across the short end of the slot antenna. This induces an E-field distribution within the slot, and currents that travel around the slot perimeter, both contributed to radiation. The dual antenna is similar to a dipole antenna.
The voltage source is applied at the center of the dipole, so that the voltage source is rotated. Babinet's principle relates these two antennas. The first result states that the impedance of the slot antenna is related to the impedance of its dual antenna by the relation: In the above, is the intrinsic impedance of free space. That is, the fields of the slot antenna given with a subscript S are related to the fields of it's complement given with a subscript C by: Hence, if we know the fields from one antenna we know the fields of the other antenna.
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