Antenna-Cavity Coupling Effects on Measurement of Antenna Efficiency
The coupling between the cavity and the antenna is analyzed by placing a small antenna inside the cavity. It is seen that at the resonant frequencies of the cavity, the input resistances of the antenna attains values two or three orders of magnitude higher than that at frequencies removed from resonance. A field-circuit equivalence of this coupling system is derived using full wave analysis. We show that the input resistance of the antenna measured at resonant frequencies of the cavity is not merely the loss resistance desired in determining the antenna efficiency but is actually the sum of the loss resistance of the antenna and the coupling resistance of the cavity. The results of numerical computations are in reasonable agreement with measurements for a short wire antenna.
View Entire Paper | Previous Page | White Papers Search
If you found this page useful, bookmark and share it on:
Embedded Star Newsletter
Don't have time to visit Embedded Star everyday? Then sign up for our free newsletter. We'll send you an email when we have something to share with you. Your email address will be kept confidential and we will not share, sell, or rent it to anyone. You can unsubscribe at any time by clicking a link in the email.
If you are familiar with RSS feeds, you can also sign up for our free blog feed. Our RSS feed is updated in real-time while our newsletter is updated daily.
