Products and Services
Filters
Continental
Microwave RF filters offer rugged construction and can meet your high power
requirements. Whether your frequency band of interest is 2 GHz or 40 GHz, our
varied product selection has you covered for bandpass filters,
bandstop
filters, highpass
filters,
and lowpass
(absorptive or reflective) filters as well as coaxial
harmonic filters and lowpass
megawatt pulsed harmonic filters.
Lowpass
Megawatt Pulsed Harmonic Filters
Continental's
high-power bandpass filters utilize a tuned cavity design and suppress energy on
either side of the passband. Since we are concerned only with the TE10 mode in the region of
the passband, this type of filter cannot be used for harmonic rejection. The
number of cavities that are used in a filter is generally determined by the
steepness of the slope close to the passband. The more cavities, the higher the
insertion loss and the larger the phase deviation from linearity. More cavities
also increase the length of the filter.
This
type of filter is reactive and thus reflects all of the stopband energy back
toward its source. By using branching techniques, it is possible to absorbthe
reflected energy, but this increases the size and cost of the unit. For high
peak-power requirements, these devices can be designed to be hermetically sealed
for localized pressurization. These filters are constructed of either aluminum
or copper alloy and are cooled by convection and radiation unless otherwise
noted.
Bandstop
Filters
All
of the bandstop filters listed here utilize the stub-tuned design. These filters
consist of a series of E-plane T-junctions in which the shorted secondary
waveguides or cavities coupled to the main waveguide are cut off for the
fundamental frequency. The desired energy passes through the filter unaffected
while the undesired energy is reflected by the high series reactance. Stub-tuned
filters, or T-junction filters as they are sometimes called, can be designed to
handle almost the full terminating waveguide power in the passband. They are
relatively small, inexpensive and have good highpower handling capability. These
filters are constructed of either aluminum or copper alloy and cover the
frequency band from 2 GHz to 40 GHz.
Suppression
of energy in the band immediately below the passband is readily ccomplished by
using an AMC tapered waveguide or a tuned resonator filter.
All
frequencies from DC to those just below the passband are attenuated. The tapered
waveguide filter consists of a reduced width waveguide between two matching
transformers. The matching networks are critical and are the key to good design.
These
are reactive devices and, consequently, have high stop band VSWRs. Cavity
filters (bandpass design) can also be used as high-pass filters. The lower
passband skirt slope is adjustable within limits. Either aluminum or copper
alloy is used in the construction of these filters. Atlantic filters cover the 2
– 40 GHz frequency band.
Most
Continental Microwave absorptive harmonic filters use the leaky wall design
approach. This type of filter consists of a primary waveguide to which numerous
secondary waveguides are attached. Each of the secondary waveguides is connected
to the walls of the primary waveguide by means of a coupling aperture and is
terminated in a wideband matched load. At frequencies in the filter's passband,
the
secondary waveguides are cut off and the desired energy in the transmission line
passes to the output unattenuated. At frequencies in the stopband, the undesired
energy is coupled into the absorbing waveguide where it is dissipated. These
filters are normally constructed of either aluminum or copper alloy and are
cooled by convection and radiation unless otherwise noted.
Datasheet – Lowpass Filters – Absorptive
Continental's
reflective harmonic filters utilize the waffle iron design. This type of filter
is a low-pass, wide-stopband, reactive device, which obtains a stopband by
reflecting the harmonic frequencies. The alternating low and high impedance
corrugations, plus the reduced height quarter-wave transformers, attenuate the
unwanted modes. For second harmonic filtering only, stub-tuned designs can be
used. Filters shown here are constructed of either aluminum or copper alloy and
are cooled by convection and radiation unless otherwise noted.
Datasheet – Lowpass Filters Reflective
Continental Microwave offers
two types of highpower coaxial harmonic filters. The first of these is
absorptive. Continental employs a technique that offers harmonic VSWR of less
than 3.1 with less than 0.15 dB passband loss. The other type, the reflective
filter, consists of conventional high and low impedance sections in series. When
properly designed, it produces the correct values of inductance and capacitance
to give a
lowpass characteristic. These filters are relatively inexpensive to fabricate
and have low VSWR and insertion loss in the passband while producing high
attenuation at the harmonics. These
filters are normally constructed of aluminum or copper and are all cooled by
convection and radiation.
Datasheet – Coaxial Harmonic Filters
Lowpass Megawatt Pulsed Harmonic Filters
Most
Continental's low-pass megawatt pulsed harmonic filters use the leaky wall
design to obtain harmonic absorption. Leaky wall filters consist of primary
waveguides to which numerous secondary waveguides are attached. Each of the
secondary waveguides is connected to the walls of the primary waveguide by means
of a coupling aperture and is terminated
in a wideband matched load. At frequencies in the filter's passband, the
secondary waveguides are cut off and the desired energy in the transmission line
passes to the output unattenuated. At frequencies in the stopband, the undesired
energy is
coupled into the absorbing waveguide where it is dissipated. All of these
filters are constructed either of aluminum or copper alloy and are cooled by
convection and radiation unless otherwise noted.
Datasheet – Lowpass Megawatt Pulsed Harmonic Filters
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