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A fundamental list of antenna theory concepts, an antenna basics menu is given here. Topics include directivity, polarization, bandwidth, impedance, frequency bands, all things necessary for an understanding of antenna theory, antenna basics and antenna fundamentals.
- Frequency
Frequency is one of the most important concepts in the...
- Radiation Pattern
A radiation pattern defines the variation of the power...
- Field Regions
The far field region is the most important, as this...
- Directivity
The directivity is calculated for Antenna 2 to be 2.707...
- Antenna Efficiency
Being a ratio, antenna efficiency is a number between 0 and...
- Antenna Gain
The gain of a real antenna can be as high as 40-50 dB for...
- Beamwidths and Sidelobes
In addition to directivity, the radiation patterns of...
- Impedance
Antenna impedance relates the voltage to the current at the...
- Frequency
Antenna Effective length is used to determine the polarization efficiency of the antenna. Definition − “The Effective length is the ratio of the magnitude of voltage at the open terminals of the receiving antenna to the magnitude of the field strength of the incident wave front, in the same direction of antenna polarization.”
An antenna is a device that couples currents to electromagnetic waves for purposes of radiation or reception. The process by which antennas radiate can be easily understood in terms of the way in which accelerating charged particles or time-varying currents radiate, which is discussed in Section 10.1.
Figure 3.2-19 Example of a wire antenna designed using a genetic algorithm. Vector parameters might include, for example, the lengths of each straight segment of the antenna quantized in units of O/16, and the angles between successive elements, similarly quantized.
1. Definition of the Antenna and Wave-Motion The radio antenna may be defined as the interface between a circuit in which electrical power is constrained to follow conducting paths, and electromagnetic radiation travelling freely through space. The antenna may convert power in the circuit into radiated energy or vice versa, forming either
The antenna is a critical component in a wireless communication system. A good design of the antenna can relax the system requirements and improve its overall performance.
Antennas are devices for radiating or receiving radio waves; but: •. Antennae are sensitive organs of insects. •. At GHz frequencies, a physical limitation for applications in wireless commu-nications is given by the atmospheric attenuation of electromagnetic waves due to water vapor and absorption by gases [9]; see Fig. 2.1.2.
