Recent content by Ionito

I will state here what I understand in this topic which I am a little confused: If I have 2 sinusoidal signals perfectly in phase, with distinct power levels, say -13dBm and -10dBm, the composition ("sum") of both signals is -8.23dBm. Or, for -10dBm and -10dBm signals, the sum is -7dBm...

I made some research and figure out the following: 1V/m= 0 dB\muV/m. Therefore, the values I am seeing in the table correspond conversions of this reference. If the signal is not attenuated, I have 1V=1*106*\muV and 20log(V2/V1) in this case is 120. A value of 112dB means that the attenuation...

Hi skeptic2, completely sure about 1V/m, that is why I did not understand.

I have a table containing the magnitude (dB) of an electric field referred to 1 volt/meter. The values range from 112 to -36dB. How can I properly interpret the attenuation loss in each case in this table? In other words, for a reference of 1 volt/meter and no signal loss, what is the expect...

Hi Okefenokee, Thanks for the reply! I read (Barlow, 1962, Radio Surface Waves) that it is possible to use surface waves for communication. There is an example for sea water surface. On the other hand, I also read about Lateral waves in "King, 1980, Antennas in Matter" for soil and water...

Related to the Electromagnetism area, what is the difference between Surface Waves and Lateral Waves? Also: practical uses?

Please, let me rewrite my doubt. Actually, the question is not about path loss attenuation or any other kind of attenuation. It is only a conceptual question. I will make a drawing. Assume a perfect scenario: no loss, except the air path loss, same hardware for sender and receiver, symmetric...

Assume NO noise floor to consider in this problem. Note that, in this example, the RX limit of the receiver is -50dBm and it is exactly the double of -100dBm and we can quickly conclude that such reception will not occur at the point X. However, if what matters is the intersection of the...

A very basic question: the signal reception requires that the receiver be at the communication region of the sender? Or what is important is the intersection of the comm. range of both sender and receiver? A practical example: Assume that both sender and receiver have the same hardware, antenna...

Besides the obvious inefficiency (waste of energy) of a non-matching impedance between the transmission line and the antenna for a RF transmitter circuit, what are the additional effects? Is it safe to say the reflected portion of the signal returning to the source will also cause distortion...

Thank you for the answer. Besides the velocity, wavelength, and phase shift effects caused by different BETAs of lossy media, is it possible (and how) that these BETAs are also related to the attenuation behavior (a secondary factor in addition to the ALFA factor)?

In the electromagnetism theory, the phase factor or constant (usually BETA) in wave propagation for lossy medium has the unit rad/m. I understood that it must be interpreted as the amount of phase shift that occurs as the wave travels one meter. However, differently of the attenuation...

In the electromagnetism theory, the phase factor or constant (usually BETA) in wave propagation for lossy medium has the unit rad/m. I understood that it must be interpreted as the amount of phase shift that occurs as the wave travels one meter. However, differently of the attenuation...