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Slot patch antenna theory

Antenna Theory Micro Strip - Learn Antenna Theory in simple Slot; Antenna Theory - Micro Strip; Antenna The radiation pattern of a microstrip or patch antenna. The resonant behavior of the slot loaded patch antenna can be explained by initiating from the cavity model description of an unslotted rectangular patch and from cavity perturbation theory. According to cavity model, the first three modes that can be excited in the cavity are usually denoted by TM , TM and TM ) and slot size. Patch length and slot length are responsible for electric length, whereas W changes patch impedance. Slot size and location shows current distribution on patch’s surface [1]. To study the antenna performance parametric study is carried out using IE3D simulation software.

The Slot Antenna Video

As a consequence, its resonant frequency is only slightly different from that of a standard unslotted patch. This induces an E-field distribution within the slot, and currents that travel around the slot perimeter, both contributed to radiation. The radiation pattern of a microstrip or patch antenna is shown above. Artech house , and An example of dual antennas is shown in Figure 2: Dual-band reactively loaded microstrip antenna. Micro strip antennas are low-profile antennas.

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Slot antenna

The Poynting vector can be written as [36] 6 Therefore, the total power radiated from the dipole antenna is given by [36] 7 If the radiation resistance is defined in terms of maximum current then it may be given as [36] 8 Solution of equation 8 yields 9 The input impedance of the dipole or slot is given by [35] 10 the electric field along the z-direction.

Antenna Feed The structure is fed by coaxial probes. The reason behind using this feeding technique is that is the feed can be placed at any desired location inside the patch in order to match with its input impedance i. Besides, coaxial probe provides low spurious radiation. As seen from Figure 1, the inner conductor of the coaxial connector extends through the dielectric and is soldered to the radiating patch, while the outer conductor is connected to the ground plane.

The radius of the inner conductor is 0. Selection of the suitable feed location is a dilemma for dual band operation. Because the radiation pattern regularity is influenced by the symmetry of the feeds. A better procedure when slot case can be found for probe feed location using modal matching technique following [30].

Therefore simulation based iterative process is used by segmenting proposed antenna to choose the suitable feed location. Thus the feed is located at fp: According to cavity model, the first three modes that can be excited in the cavity are usually denoted by TM, TM and TM These modes correspond to longitudinal currents distributed on the patch which have nulls at the radiating edges.

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Details

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.

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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.

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