The chip antennas use some material, usually ceramic, that has high permittivity and low losses. In a medium having high permittivity, the wavelength is shorter than in the free space. This way the ...

You have mixed up the characteristic impedance of a coaxial cable with the DC impedance measured from a piece of that cable. So I'll tell you what you measured and then what you could have done ...

The antenna efficiency refers the ratio of radiated power and the power fed to the antenna. The rest of the fed power is transformed to heat by the losses in the antenna. Thus, the antenna efficiency ...

This isn’t a solution to your problem, but I had similar challenges with UHF RFID at 865 MHz. In UHF RFID the tags are electrically short dipoles modulated by the chip impedance. I thought it would ...

I don't have the full answer, but I hope I can give you some pointers on where to search. If you get a HAREC (Harmonised Amateur Radio Examination Certificate) license in any country that complies ...

Filtering square wave aims to produce as pure as possible sine wave as the local oscillator frequency. If you would feed all the harmonics to the non-linear modulator, the output would contain all the ...

At least in Finland you are allowed to use the entire band from 10.0 GHz to 10.5 GHz with "secondary rights". Maximum TX powers are 30 W (basic class) and 150 W. The 3 cm band is also available at ...

Unfortunately you cannot increase the bandwidth much: the sampling rate in RTL2832U is at maximum 3.2 megasamples / second. In theory (Nyquist theorem) you could get ±1.6 MHz banwidth, but that is ...

As pointed out, the short answer is no. The Q value for the series resonance of a crystal can be calculated from $Q = \frac{2\pi f_s L_m}{r_m}$. Q value is of course related to the bandwidth: $Q = \... View answer 3 votes The rubber duck antennas are monopole antennas that have their length of wire turned into a helix. The helical shape allows you to cram the same length of wire into a smaller volume, just as you ... View answer 3 votes In a traveling plane wave the ratio of the electric ($\vec{E}$) and magnetic field ($\vec{H}$) is always the wave impedance of the medium (377$\Omega$for air or vacuum). Further, the fields are ... View answer Accepted answer 3 votes What do you mean by reversing connection? If you just swap the ground and center wire of the feeding coaxial you create 180 phase shift, not change the polarization. The polarization of a helix ... View answer 2 votes The ionosphere contains freely moving charged particles that act like a conducting "plate". When a radio wave traveling up reaches the ionosphere, the electric field of the wave starts to move the ... View answer 2 votes Yes, the characteristic impedance of the transmission line$Z_0$does not change (it is a property of the cable itself), but the impedance seen from the end of the cable depends on the length of the ... View answer 2 votes As others have pointed out, the discrete components, suchs as capacitors and inductors, start to be quite challenging in higher frequencies. In general, transmission lines tend to have lower losses ... View answer Accepted answer 1 votes You had three separate questions there, I'll try to clarify some concepts: How can a time - varying magnetic field induce current in vertical strips Faraday's law of induction tells us how much ... View answer 1 votes For any antenna, also for wire antennas, you can calculate so called effective area with$A_{eff} = \frac{\lambda^2}{(4\pi)}G$. An ideal antenna with surface area of$A_{eff}\$ absorbs the same amount ...

A major edit to my original answer to capture the comments below. The Friis equation, that I originally suggested, does not apply in this situation since the receiving antenna is only around one ...