DIELECTRIC RESONANT ANTENNA
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31-01-2009, 12:47 AM


An antenna is defined by Oxford Dictionary as ? a usually metallic device for radiating or receiving radio waves ?. The IEEE Standard Definitions of terms for Antennas ( IEEE Std 145-1973) defines the antenna or aerial as ? a means for radiating or receiving radio waves ?. In other words the antenna is the transitional structure between free-space and a guiding device. The guiding device or transmission line may take the form of a coaxial line or a hollow pipe (wave guide) and it is used to transport electromagnetic energy from the transmitting source to the antenna or from the antenna to the receiver. In the former case we have a transmitting antenna and in the latter a receiving antenna.

History of radio antennas began as early as 1887 with the first design taking the form of a loop. It was not until 1901 that Marconi used an array of fifty copper wires to perform the first transatlantic transmission. The greatest advancement was due to the introduction of microwave antennas taking the form of reflectors, apertures and arrays. With the introduction and advancement of computer techniques, antenna theory was again revised. The introduction of new elements and design of effective approaches have enhanced the efficiency and effectiveness of modern antennas.
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03-07-2012, 03:13 PM

Dielectric Resonator Antenn


.pptx   Dielectric Resonator Antenn.pptx (Size: 142.55 KB / Downloads: 33)
Objective

To design a Ring Dielectric Resonator Antenna with an air gap between the dielectric resonator and ground for bandwidth enhancement.

Dielectric Resonator Antenna

Dielectric Resonator Antenna is a radio antenna used at microwave frequencies and higher.
Consists of dielectric resonator and a ground plane.
Can be excited with different feeding methods.

Ring DRA

Proposed DRA formed by removing the central portion of the dielectric material of the cylindrical DRA.
According to perturbation theory, the removal of dielectric material would result in lowering of the Q-factor and increase in the resonant frequency.

Conclusion

The impedance bandwidth of 86% is obtained as the band covers the range of frequency from 3.2 GHz to 7.39 GHz.
This antenna can be use for WLAN as well as RFID applications.
The proposed ring DRA is suitable for broadband wireless communication system.


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