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Annular slot antenna theory

The annular slot antenna consists of a circular slot on a square “Antenna Theory Analysis and Design”, John Wiley & sons, Second Edition, pp. – CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): Abstract-The general theory of annular slot antennas is developed in a Z 2 lucid manner. Four-element linear array of microstrip annular ring slot antenna at 9 GHz linear array of microstrip annular ring slot antenna 2 Theory The geometry and co.

An Annular Waveguide Slot Antenna

If we can excite some reasonable fields in the slot often called the aperture , we have a slot antenna. The initial discussion on the theory of annular waveguide was briefly provided in [9, 10] with the complete details recently provided in [11]. 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. This induces an E-field distribution within the slot, and currents that travel around the slot perimeter, both contributed to radiation. A single slot annular waveguide slot antenna AWSA is designed and fabricated based on the derived model and impedance and radiation pattern measurement results are provided and compared with those of simulation and theory.

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The Slot Antenna Video

Slot antennas are used typically at frequencies between MHz and 24 GHz. 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.

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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.

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Details

Do you want to read the rest of this article? For full functionality of ResearchGate it is necessary to enable JavaScript.

Here are the instructions how to enable JavaScript in your web browser. In this letter, an introduction to a novel annular slot cut on the broad wall of an annular waveguide is presented. An equivalent circuit model is suggested for the structure based on its similarity to the rectangular slotted-waveguide case. Full-wave analysis is performed using two numerical commercial software packages and the circuit model expectation is verified.

A single slot annular waveguide slot antenna AWSA is designed and fabricated based on the derived model and impedance and radiation pattern measurement results are provided and compared with those of simulation and theory.

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A discussion on possible circular array combination of the AWSA is presented finally. This has led to alternative radiating structures having more geometrical balance with the boundary such as AWSA. The concept of AWSA was introduced in [3] to be employed in circular boundary planar slot array antennas as an alternative to common rectangular waveguides. It was shown by initial simulation and measurement that such kind of annular slotted waveguides is feasible in the desired application.

There was no theoretical knowledge of the annular waveguide in [3] and it was considered to have the same characteristics as the rectangular waveguide. It was predicted that by using the proposed structure it would be possible to achieve polarization agility, with less discritization error and higher gain from the slot array antennas.

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