Knowledge in Antenna
RADIO FREQUENCY COMMUNICATION
Antenna ,its parameters and brief about the components.
Prabhanshi Dhankar
Antennas and wave propagation.
Antennas & Wave Propagation Materials & Notes - Download AWP Text Book Class / Lecture Notes pdf - AWP Unit Wise Lecture Notes and Study Materials in pdf format for Engineering Students. So all students seeking Antennas & Wave Propagation Book for engineering colleges.
Sourav Jha
ANTENNA ENGINEERING
An antenna is defined by Webster’s Dictionary as “a usually metallic device (as a rod or wire) for radiating or receiving radio waves.” The IEEE Standard Definitions of Terms for Antennas (IEEE Std 145–1983)∗ 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, as shown in Figure 1.1. The guiding device or transmission line may take the form of a coaxial line or a hollow pipe (waveguide), 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. A transmission-line Thevenin equivalent of the antenna system of Figure 1.1 in the transmitting mode is shown in Figure 1.2 where the source is represented by an ideal generator, the transmission line is represented by a line with characteristic impedance Zc, and the antenna is represented by a load ZA [ZA = (RL + Rr ) + jXA] connected to the transmission line. The Thevenin and Norton circuit equivalents of the antenna are also shownin Figure 2.27. The load resistance RL is used to represent the conduction and dielectric losses associated with the antenna structure while Rr , referred to as the radiation resistance, is used to represent radiation by the antenna. The reactance XA is used to represent the imaginary part of the impedance associated with radiation by the antenna. This is discussed more in detail in Sections 2.13 and 2.14. Under ideal conditions, energy generated by the source should be totally transferred to the Radiation resistance Rr , which is used to represent radiation by the antenna. However, in a practical system there are conduction-dielectric losses due to the lossy nature of the transmission line and the antenna, as well as those due to reflections (mismatch) losses at the interface between the line and the antenna. Taking into account the internal impedance of the source and neglecting line and reflection (mismatch) losses, maximum power is delivered to the antenna under conjugate matching.
Shantha Kumar . V
75+ antonym class 12 leval
this pdf consist 75 antonym. Antonym importance suggests that certain things are not as important as others. It can be used to prioritize tasks, resources, or facts. For example, it may be important to focus on the most urgent tasks first, or to save the most important resources for later. In terms of facts, it might be important to focus on the most relevant or significant pieces of information, rather than on details that are of lesser importance.
Rohit Lodhi
Application to Short antenna RGPV EC BRANCH
Short antenna handwritten notes decription application can be used to quickly document and store important information related to antenna design and engineering. The application provides an easy-to-use interface which allows users to quickly input notes or diagrams, attach photos or videos, and store them in a secure and organized repository. The application can also be used to quickly review and access previously stored notes and diagrams. This can be especially useful when designing new antennas or researching existing antenna designs. Additionally, the application can be used to quickly share notes and diagrams with colleagues, allowing for collaborative antenna design projects.