| RF
Filter Industry Definitions
RF
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 frequency). This frequency range is the
range used by most broadcast radio, television, wireless communication
(cellphones, Wi-Fi, etc...), and thus most rf and microwave
devices will include some kind of filtering on the signals
transmitted or received. Such filters are commonly used as
building blocks for duplexers and diplexers to combine or
separate multiple frequency bands
RF
Saw Filter
SAW (surface acoustic wave) filters are electromechanical
devices commonly used in radio frequency applications. Electrical
signals are converted to a mechanical wave in a device constructed
of a piezoelectric crystal or ceramic; this wave is delayed
as it propagates across the device, before being converted
back to an electrical signal by further electrodes. The delayed
outputs are recombined to produce a direct analog implementation
of a finite impulse response filter. This hybrid filtering
technique is also found in an analog sampled filter.
RFI
radio frequency interference or RFI is a disturbance that
affects an electrical circuit due to either electromagnetic
induction or electromagnetic radiation emitted from an external
source.[1] The disturbance may interrupt, obstruct, or otherwise
degrade or limit the effective performance of the circuit.
The source may be any object, artificial or natural, that
carries rapidly changing electrical currents
Diplexer
A diplexer is a passive device that implements frequency domain
multiplexing. Two ports (e.g., L and H) are multiplexed onto
a third port (e.g., S). The signals on ports L and H occupy
disjoint frequency bands. Consequently, the signals on L and
H can coexist on port S without interfering with each other.
Band
Pass
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 RLC circuit (a resistor–inductor–capacitor
circuit). These filters can also be created by combining a
low-pass filter with a high-pass filter.
Low
Pass Filter
A low-pass filter is a filter that passes low-frequency signals
but attenuates (reduces the amplitude of) signals with frequencies
higher than the cutoff frequency. The actual amount of attenuation
for each frequency varies from filter to filter. It is sometimes
called a high-cut filter, or treble cut filter when used in
audio applications.
High
Pass Filter
A high-pass filter, or HPF, is an LTI filter that passes high
frequencies well but attenuates (i.e., reduces the amplitude
of) frequencies lower than the filter's cutoff frequency.
The actual amount of attenuation for each frequency is a design
parameter of the filter. It is sometimes called a low-cut
filter or bass-cut filter.
Component
An electronic component is a basic electronic element and
may be available in a discrete form having two or more electrical
terminals (or leads). These are intended to be connected together,
usually by soldering to a printed circuit board, in order
to create an electronic circuit with a particular function
(for example an amplifier, radio receiver, or oscillator).
Basic electronic components may be packaged discretely, as
arrays or networks of like components, or integrated inside
of packages such as semiconductor integrated circuits or thick
film devices. The following list of electronic components
focuses on the discrete version of these components, treating
such packages as components in their own right.
DC
Direct current (DC) is the unidirectional flow of electric
charge. Direct current is produced by such sources as batteries,
thermocouples, solar cells, and commutator-type electric machines
of the dynamo type. Direct current may flow in a conductor
such as a wire, but can also flow through semiconductors,
insulators, or even through a vacuum as in electron or ion
beams. The electric charge flows in a constant direction,
distinguishing it from alternating current (AC). A term formerly
used for direct current was galvanic current.
AC
in a simple alternating current (AC) circuit consisting of
a source and a linear load, both the current and voltage are
sinusoidal. If the load is purely resistive, the two quantities
reverse their polarity at the same time. At every instant
the product of voltage and current is positive, indicating
that the direction of energy flow does not reverse. In this
case, only real power is transferred.
LC
An LC circuit, also called a resonant circuit or tuned circuit,
consists of an inductor, represented by the letter L, and
a capacitor, represented by the letter C. When connected together,
they can act as an electrical resonator, an electrical analogue
of a tuning fork, storing electrical energy oscillating at
the circuit's resonant frequency.
Surface
Mount
Surface mount technology is a way to construct electronic
circuits in which the surface mount components are mounted
right onto the surface of the printed circuit boards. Electronic
devices that use this technology are called a surface mount
device.
Leaded
Leaded insulation encapsulated inside the filter body reduces
the possiblity for accidental shorting. A certain line of
flexible leaded EMI filters generally comes in a bolt or broadband
configurations.
RF Filter
- For more information regarding RF Filters, please
contact our Sales Department.
RELATED
LINKS:
SAW
Filter Manufacturers, Designers, and Suppliers of Products
IF SAW Filter Manufacturers, Designers,
and Suppliers of Products
RF Filter, SAW Filter, Crystal
Oscillator, TCXO, VCXO, IF Saw Filter, Ceramic Resonator and
Ceramic Filter Manufacturer
IF SAW Filter Frequency
Build a Custom
SAW Filter Worksheet
Oscilent
Product Reference - Murata Cross Filter and Ceramic Resonator
with RF and SAW Filter
140 MHz SAW Filter
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