Radio spectrum
The radio spectrum is the part of the electromagnetic spectrum from 8.3 kHz to 3000 GHz allocated to some 40 Radiocommunication services in line to the Radio Regulations (RR) of the Internat...
Band-stop filter
In signal processing, a band-stop filter or band-rejection filter is a filter that passes most frequencies unaltered, but attenuates those in a specific range to very low levels. It is the opposite o...
Band-stop filter - Wikipedia
Bandwidth (signal processing)
Bandwidth is the difference between the upper and lower frequencies in a continuous set of frequencies. It is typically measured in hertz, and may sometimes refer to passband bandwidth, sometimes to ...
Bandwidth (signal processing) - Wikipedia
Transition band
The transition band, also called the skirt, is a range of frequencies, that allows a transition between a passband and a stopband of a signal processing filter. The transition band is defined by a pas...
Antenna tuner
An antenna tuner, transmatch, or antenna tuning unit (ATU), or antenna coupler is a device connected between a radio transmitter or receiver and its antenna to improve power transfer between them by m...
Antenna tuner - Wikipedia
All-pass filter
An all-pass filter is a signal processing filter that passes all frequencies equally in gain, but changes the phase relationship between various frequencies. It does this by varying its phase shift as...
Bode plot
In electrical engineering and control theory, a Bode plot /ˈboʊdi/ is a graph of the frequency response of a system. It is usually a combination of a Bode magnitude plot, expressing the magnitude of ...
Bode plot - Wikipedia
High-pass filter
A high-pass filter is an electronic filter that passes signals with a frequency higher than a certain cutoff frequency and attenuates signals with frequencies lower than the cutoff frequency. The amou...
High-pass filter - Wikipedia
Choke (electronics)
In electronics, a choke is an inductor used to block higher-frequency alternating current (AC) in an electrical circuit, while passing lower-frequency or direct current (DC). A choke usually consists ...
Choke (electronics) - Wikipedia
Shortwave radio
Shortwave radio is radio transmission using shortwave frequencies, generally 1.6–30 MHz, just above the medium wave band.Shortwave radio is used for long distance communication by means of skywav...
Shortwave radio - Wikipedia
Crystal filter
A crystal filter is an electronic filter that uses quartz crystals for resonators. Quartz crystals are piezoelectric, so their mechanical characteristics can affect electronic circuits. (see mechanica...
Passband
A passband is the range of frequencies or wavelengths that can pass through a filter.A bandpass-filtered signal (that is, a signal with energy only in a passband), is known as a bandpass signal contra...
Passband - Wikipedia
Variable-frequency oscillator
A variable frequency oscillator (VFO) in electronics is an oscillator whose frequency can be tuned (i.e. varied) over some range. It is a necessary component in any tunable radio receiver or transmitt...
Variable-frequency oscillator - Wikipedia
Line filter
A line filter is the kind of electronic filter that is placed between an electronic equipment and a line external to it, to attenuate conducted radio frequencies -- RFI, also known as electromagnetic ...
Line filter - Wikipedia
800 MHz frequency band
The 800 MHz frequency band is a portion of the electromagnetic spectrum, or frequency band, that encompasses 790–862 MHz.Being a part of the spectrum known as "UHF Bands IV and V" (i.e. 470M...
Roll-off
Roll-off is the steepness of a transmission function with frequency, particularly in electrical network analysis, and most especially in connection with filter circuits in the transition between a pas...
Roll-off - Wikipedia
YIG sphere
Yttrium iron garnet spheres (YIG spheres) serve as magnetically tunable filters and resonators for microwave frequencies. These filters are used for their high Q factors. A sphere made from a single ...
Guard band
In radio, a guard band is an unused part of the radio spectrum between radio bands, for the purpose of preventing interference.It is a narrow frequency range used to separate two wider frequency range...
Guard band - Wikipedia
Band-pass filter
A band-pass filter is a device that passes frequencies within a certain range and rejects (attenuates) frequencies outside that range.
An example of an analogue electronic band-pass filter is an R...
Luxemburg–Gorky effect
In radiophysics, the Luxemburg–Gorky effect is a phenomenon of cross modulation between two radio waves, one of which is strong, passing through the same part of a medium, especially a conductive regi...
Spectrum commons theory
The Spectrum Commons theory states that the telecommunication radio spectrum should be directly managed by its users rather than regulated by governmental or private institutions. Spectrum management ...
Spectrum commons theory - Wikipedia
Tuned filter
In signal processing, a tuned filter is a stage in the processing channel which accepts or rejects signals which are tuned for a specific type.
Historically, the concept of tuning was to maintain ...
Tuner (radio)
A tuner is a subsystem that receives radio frequency (RF) transmissions like radio broadcasts and converts the selected carrier frequency and its associated bandwidth into a fixed frequency that is su...
Personal RF safety monitors
Electromagnetic field dosimeters measure the exposure to electromagnetic radiation in certain ranges of theelectromagnetic spectrum. This article concentrates on dosimeters used in the telecommunicati...
Personal RF safety monitors - Wikipedia
RF and microwave filter
Radio frequency (RF) and microwave filters represent a class of electronic filter, designed to operate on signals in the megahertz to gigahertz frequency ranges (medium frequency to extremely high fre...
RF and microwave filter - Wikipedia
Dielectric resonator
A dielectric resonator is a piece of dielectric (nonconductive) material, usually ceramic, that is designed to function as a resonator for radio waves, generally in the microwave and millimeter wave ...
Automatic frequency control
In radio equipment, Automatic Frequency Control (AFC), also called Automatic Fine Tuning (AFT), is a method or circuit to automatically keep a resonant circuit tuned to the frequency of an incoming ra...