Bandpass Filters

Low insertion loss filters (0.1 dB) are essential for many of today’s defense platforms and modern wireless environments that require high spectral fidelity. Low insertion loss filters (0.1 dB) help receivers detect and process low-power targets, as well as discern targets of interest in interference-heavy environments. Spectrum Control offers 0.1 dB loss bandpass filters to help identify weak communication transmissions and recognize valuable intelligence signals in a crowded spectrum.

Our database of low-loss bandpass filter designs (0.1 dB) helps eliminate the need for additional gain when Size, Weight, and Power (SWaP) initiatives are in place. Low-loss filters from Spectrum Control also help suppress harmonics at the receiver front end when complex pulse or chirp signals are cascaded in the receive-side chain. This is especially critical where a flat amplitude response helps prevent distortion and unwanted spurious modulation.

Spectrum Control’s line of low-loss bandpass filter designs (0.1 dB) delivers insertion loss as low as 0.1 dB while optimizing pole-placement strategies to achieve high rejection in a compact design. These low-loss bandpass filters (0.1 dB) also help maintain receiver sensitivity in crowded wireless spectra. High insertion loss can lead to excessive heat, requiring additional cooling strategies or heavier metal packaging to prevent thermal runaway. Low-loss bandpass filters (0.1 dB) from Spectrum Control improve signal-to-noise ratio (SNR) performance by providing a lower-loss path for weak signals, maintaining spectral purity without harmful bit-error-rate (BER) degradation. Spectrum Control also offers a selection of Rapid Filter options, providing bandpass filters in both Chebyshev and Elliptic functions to meet critical demand requirements.

Visit our Bandpass Filter Customization Tool today to optimize your demanding filter requirements.

Lumped Element Filters Cavity Filters Advanced SAW Filters Ceramic Filters 3D Glass Filter Suspended Substrate Filters

Lumped Element Filters

Spectrum Control’s superior low-loss (0.1 dB) lumped element designs are ideal for applications where size and weight are critical. Our filter engineers are experts in lumped element design techniques and employ a range of innovative methods to meet today’s demanding specifications.

Lightweight surface-mount packages for airborne applications
Silver plating to reduce insertion loss
Integral shielding for improved isolation
Strategically placed poles for maximum rejection
Multiple topologies integrated within a single package for broad frequency coverage

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Cavity Filters

One of the advantages of selecting Spectrum Control’s cavity filter designs is their industry-leading low insertion loss performance (0.1 dB) combined with high power-handling capability (up to 400 watts). Spectrum Control engineers have researched the suppression of intermodulation products in low-loss (0.1 dB), high-power (400-watt) cavity designs and, through careful process control and component selection, have developed specialized design techniques to meet our customers’ demanding requirements.

Machined from lightweight aluminum alloys to reduce weight
Gold and silver plating using NADCAP-controlled processes
Proprietary techniques to minimize temperature drift to less than 1 ppm/°C
Spectrum Control’s pseudo-elliptic designs incorporate cross-coupling to create transmission zeros, resulting in enhanced close-in rejection performance without increased insertion loss
Unique resonator designs that increase peak power-handling capability
Silver plating on resonators and internal cavity surfaces to achieve higher Q compared to lower-cost plating methods
Low dielectric constant stabilizing structures designed to withstand extreme shock and vibration environments

Pseudo-elliptic designs developed by our engineers reduce the number of poles required to meet specified rejection responses, resulting in smaller filters with lower insertion loss (0.1 dB) and reduced cost. Similar techniques can also be applied to provide passband group delay equalization or to increase rejection across a specified stopband region.

Advanced SAW Filters

Spectrum Control continues to deliver advanced SAW technology for today’s military and commercial markets. These SAW filters, operating at frequencies up to 1600 MHz, offer a range of outstanding features, including:

Low insertion loss below 2 dB
Shape factors below 1.1:1
Fractional bandwidths up to 60%
100% tested
Pre-aged at 100°C
Gold wire bonds used on all ball bonds to reduce loss
Silicon thermoset resin to dampen stray acoustic energy and reduce distortion
Superior group delay performance, as low as 8 ns unit-to-unit

Ceramic Filters

Spectrum Control designers are experts in the application of multiple filter topologies, including creative mixed-topology approaches that can be integrated into a single design. High-complexity ceramic filters—such as a six-pole, 2100 MHz design with a 45/0.5 dB shape factor of less than 3:1—demonstrate exceptional performance while delivering strong value.

Gold-plated surface-mount packages improve solderability and corrosion resistance
Alternative coupling structures offer superior performance
Capacitive coupling arrays provide enhanced reliability and repeatability
Ceramic resonator designs as small as 2 mm reduce overall filter footprint
Lead-free solders are used to comply with strict RoHS standards
Select designs are laser-sealed using Spectrum Control’s in-house sealing methodologies

3D Glass SMT Filter

Spectrum Control continues to advance filter technology with the release of its new ultra-miniature glass filters. These high-Q filters, operating at frequencies up to 10 GHz, offer a range of outstanding features, including:

Low insertion loss below 2 dB in many designs
Rejection levels up to 70 dB
Group delay of 1 ns across temperature
Input power handling up to 1 watt
Customization to meet demanding requirements

Suspended Substrate Filters

Spectrum’s low-loss suspended substrate filters enable complex transfer functions by integrating multiple filter topologies within a single package. Spectrum Control’s expert engineers optimize low-loss suspended substrate designs to meet demanding performance requirements. Suspended substrate features include:

Expertise in combining lumped and distributed elements within a single suspended substrate design, providing enhanced unloaded Q and exceptionally low insertion loss
Gold vias for superior isolation
Cauer pole–placed transfer functions that yield low insertion loss performance
Integrated cleanup low-pass filters for improved broadband performance

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