Antenna engineering Definition and 16 Threads

Assume we have a general rf system where source with impedance ##Z_S## transfers a signal to a load with impedance ##Z_L## through a transmission line with impedance ##Z_T##. We want to match this system in order to maximize it's effiency: In https://en.wikipedia.org/wiki/Impedance_matching...

Hi everyone, I would like to get some help with the following problem. I'm not sure if my answer is feasible. Thanks. My attempt at a solution: I used the noise power equation: Pn= 10*log10(kTB) and converted the -100 dBm to dBW by subtracting 30 dB to get -130 dBW. Then I tried to find the...

Summary:: I am stuck on a problem on dish antenna C/N and it's relation to frequency. Please see below for thought process. Problem Statement: , Link budget formula in dB form: Pr = Pt + Gt + Gr + 20*log10(lambda/(4*pi*distance)) - Losses [dB] C/N = Pr - Pn [dB], where Pn = 10*log10(k*T*B)...

Is it possible (and if so how practical) to overdamp a conductor wire that is many times longer than the wavelength of the incident radiation so that it doesn't reradiate any detectable amount, turning practically all incident radiation into heat?

Is there a (dielectric) antenna of this shape ---o---o---o---o--- | | | | ---o---o---o---o--- i.e. a ladder? What is the good for such antennas?

I'm curious about anyone that has concrete hands on experience tinkering with very small low frequency antennas. My band of interest is 6, 13 or 27 MHz. I wonder if it is possible to design a very small physical antenna that will radiate with some directivity even if the efficiency is not so...

Is a small-loop antenna a dipole or a monopole? Is a (small) 8-shape antenna a dipole or a monopole? Is a 8-shape antenna a dipole antenna?

Over the literatures there are S-shape and 8-shape antennae been discussed. What are the differences? The 8-shape seems to be found in amature using magnetic loop. Why magnetic?

Is there an antenna of S shape or perhaps a butterfly shape? What is the benefit of such design?

WiKi indicate Millimetre Wave Antennas for Gigabit Wireless Communications: A Practical Guide to Design and Analysis in a System Context Huang, Kao‐Cheng ; Edwards, David J. Chichester, UK: John Wiley & Sons, Ltd But our library do not have this book. Has anyone know other book on this...

Could an antenna made from a non-conductor or a poor conductor?

My question stems from the Cosmic-1 satellites using single antennas for radio occultation and the cosmic-2 sats that will use a phased array antenna. I've done a fair amount of research in regards to the phased array antenna. Overall it seems to improve the signal to noise ratio when making...

Good evening everyone! Given that I have no experience in antenna physics or related areas, I'm studying a paper for a project I will be involved. It is an image sensor for THz e.m. waves and exploits micro-bowtie antennas to "capture" the signal and convert it through a standard CMOS imager...

I don't know why I was persuaded that in the free space, the electric field of an EM wave is always orthogonal to the direction of propagation. I've recently read my old textbook, and found that this is true only when the wave is far from the emitting source. But if I've understood right the...

Hey all, I am trying to do a read through on antenna theory (using Constantine's book) and am wondering if there is any online course that might follow the book or serve as a good reference. I have found pretty good success in supplementing a book with an online course in the past (i.e...

Hello, Just a big fan of this forum, where people always bring up interesting questions. And it also helped me a lot in my study of electromagnetic. I got a bachelor degree of mechanical engineering. However, during my post graduate study, I turned out to be a antenna engineer by chance, and...