Power and losses — Lesson 1

This lesson covers the concept of link budget in wireless communication, focusing on the power requirements in a wireless link. It explains the concept of isotropic transmitters and how power is radiated spherically from a point source. The lesson also discusses the power flux density and how it reduces with the increase in distance. It further delves into the concept of effective isotropic radiated power (EIRP) and how it is affected by the gain of the antenna. The lesson also touches upon the concept of path loss and how it increases with frequency. It concludes with a discussion on antenna de-pointing loss and feeder loss.

Video Highlights

00:18 - Introduction
00:57 - Power requirements
09:28 - Receive power with effective aperture
14:12 - Concept of path loss and its implications
19:05 - Antenna de-pointing loss and its calculation
25:24 - Concept of feeder loss
27:27 - Conclusion and preview of the next class

Key Takeaways

- Link budget is a crucial aspect of wireless communication, determining the power requirements and noise levels in a wireless link.
- Isotropic transmitters radiate power spherically, and the power flux density reduces with the increase in distance.
- Effective Isotropic Radiated Power (EIRP) is a term that represents the multiplication of the power of the transmitter and the gain of the antenna.
- Path loss increases with frequency, leading to more loss at higher bands of operation.
- Antenna de-pointing loss occurs when the antenna is not properly aligned, reducing the power received.
- Feeder loss occurs due to the loss of power in the cables and waveguides connecting the power amplifier to the antenna.