filtro.net

Filtronetics builds all five filter families around the same goal — custom passive RF filtering for space, defense, medical, and industrial systems — but each technology wins in a different part of the design space. Cavity filters are the choice when you need low insertion loss and high power handling; ceramic filters when you need high Q with thermal stability in a smaller package; crystal filters when bandwidth must be extremely narrow and frequency accuracy is critical; SAW filters when the device is compact and needs sharp selectivity; and LC/microwave filters when the requirement is broad frequency selection, EMI suppression, or signal conditioning. The right pick depends on which of those constraints is hardest in your application.

Quick comparison

Cavity filters

Cavity filters are high-performance RF and microwave filters built for applications that demand low insertion loss, high selectivity, and strong power handling. That combination makes them the natural fit when a weak received signal must survive a lossy front end, or when the filter sits near a transmit path and has to absorb real power without degrading.

Choose cavity when power handling and insertion loss dominate your requirements and the physical size of a cavity structure is acceptable.

Ceramic filters

Ceramic filters use ceramic resonators to reach high Q with excellent thermal stability and low insertion loss. The material properties are what make them suitable for wireless systems, communications equipment, and rugged environments where temperature swings would otherwise shift performance.

Choose ceramic when you want strong selectivity and stable behavior over temperature in a package smaller than a cavity design.

Crystal filters

Crystal filters deliver ultra-narrowband response with outstanding frequency precision and long-term stability. That precision is why they appear in IF stages and mission-critical RF signal paths, where a small frequency drift over years of service is not acceptable.

Choose crystal when bandwidth must be very narrow and frequency accuracy matters more than wideband flexibility.

SAW filters

SAW (surface acoustic wave) filters provide excellent frequency stability and sharp selectivity in a compact form factor. They suit small devices that still need consistent performance in harsh conditions — the filter does the selectivity work without the bulk of a cavity or the resonator count of a crystal design.

Choose SAW when board space is tight but you cannot give up selectivity or stability.

LC/Microwave filters

LC/microwave filters are custom-built using lumped-element (LC) or distributed microwave topologies. That flexibility makes them ideal for EMI suppression, signal conditioning, and frequency selection across a wide range of bands, rather than for one narrow, fixed response.

Choose LC/microwave when your requirement spans a broad band, when you need to suppress interference, or when the filter is one stage in a larger signal chain rather than the defining element.

How to decide

Work through the constraints in this order:

1. Power level. If the filter must handle significant RF power, start with cavity.
2. Bandwidth. If the passband is extremely narrow, crystal is the strongest candidate.
3. Size. If the enclosure is small, SAW or ceramic usually fits where cavity and crystal do not.
4. Temperature environment. If thermal drift is a concern, ceramic and SAW both emphasize stability.
5. Bandwidth span and function. If you need wideband selection, EMI suppression, or general signal conditioning, LC/microwave gives the most design freedom.

If two constraints conflict — for example, high power and a very small package — the trade-off is exactly the kind of problem Filtronetics' custom design service exists to solve, so the practical next step is to describe the requirement rather than force it into one catalog category.

Beyond filters

Filtronetics also designs and manufactures custom magnetics (coils, solenoids, and inductive products for RF, power, and industrial use), oscillators (frequency control modules with low phase noise and good temperature stability, in multiple package types), and quartz crystals (SMD and through-hole, from consumer standards up to military and space specifications). If your signal chain needs a reference or an inductive component alongside the filter, those families are worth checking in the same pass.

The company positions itself as a custom design and manufacturing house for passive RF components, EMI filters, and magnetics, with an engineering staff covering electrical engineering, CAD, high-reliability design and manufacture, physics, applied mathematics, and mechanical engineering. For a filter that has to meet a specification rather than match a part number, that custom capability is the relevant detail.

Filtronetics (filtro.net) designs and manufactures custom passive RF components, EMI filters, and magnetics, with a product line spanning nine categories: cavity, ceramic, crystal, LC/microwave, monolithic, and SAW filters, plus custom magnetics, oscillators, and quartz crystals. The company positions these products for Space, Defense, Medical, and Industrial systems, and offers a Filter Builder tool for custom design work. If your application needs a standard catalog part, a fully custom design, or a high-reliability build for harsh or mission-critical environments, the relevant category is likely covered below.

Filter product categories

How to choose between filter types

The choice depends on the trade-off your design can tolerate:

• Need the lowest insertion loss and highest power handling? Cavity filters are built for that combination, at the cost of physical size.
• Need narrow bandwidth with precise frequency control? Crystal filters are the ultra-narrowband option, commonly used in IF stages.
• Need thermal stability in a compact or rugged package? Ceramic, monolithic, and SAW filters all address this, but with different selectivity and frequency-range trade-offs.
• Need flexibility across a wide frequency range or EMI suppression? LC/microwave filters use lumped-element or distributed topologies and are custom-built to the requirement.

Frequency control components

Beyond filters, Filtronetics supplies two categories of frequency control parts:

• Oscillators — frequency control modules designed for low phase noise and excellent temperature stability, available in multiple package types and configurations.
• Quartz Crystals — SMD and through-hole packages, meeting requirements from consumer standards up to military and space specifications.

These are relevant if your signal chain needs a stable reference or clock source alongside filtering.

Custom magnetics

Filtronetics designs and manufactures custom and standard coils, solenoids, and inductive products for RF, power, and industrial applications worldwide. This category is separate from the filter line and is aimed at designs that need a tailored inductive component rather than an off-the-shelf part.

Custom design and engineering support

The company describes itself as a custom design and manufacturing operation rather than a catalog-only supplier. Its technical staff covers electrical engineering, CAD, hi-reliability design and manufacturing, physics, applied mathematics, and mechanical engineering. For buyers, this matters in two ways:

1. Non-standard requirements are the norm. If no catalog part matches your frequency, bandwidth, power, or packaging constraints, the custom design path is the intended route.
2. Hi-reliability experience is stated explicitly. This is relevant for Space, Defense, and Medical programs where documentation and reliability standards are stricter than commercial work.

The site also provides a Filter Builder tool, which is the starting point for specifying a custom filter rather than browsing standard parts.

What to check before contacting them

To get a useful response, have these parameters ready:

• Center frequency and bandwidth
• Insertion loss and rejection requirements
• Power handling level
• Operating temperature range and environmental conditions
• Package or form-factor constraints
• Applicable reliability or qualification standard (commercial, military, space)

Because pricing and ordering details are not published on the site, expect to go through a quote or contact process rather than an online checkout.

Filtronetics, Inc. is a custom designer and manufacturer of passive RF components, EMI filters, and magnetics. According to its website, its filters are built for "Space, Defense, Medical, and Industrial systems," and the company positions itself as an industry leader in custom RF filter design. If you need a standard catalog filter or a fully custom passive RF component for a demanding environment, Filtronetics is a relevant supplier to evaluate.

What Filtronetics makes

The company's product line covers the main passive RF filter technologies plus related frequency-control and magnetic components:

Who it serves

The site names four primary markets: space, defense, medical, and industrial systems. This matters if your application requires high-reliability design rather than commodity parts. The company states it employs engineering staff with combined experience in electrical engineering, CAD, hi-reliability design and manufacture, physics, applied mathematics, and mechanical engineering — a signal that custom engineering support is part of the offering, not just catalog sales.

Standard vs. custom

Filtronetics describes itself as a custom design and manufacture house. In practice that means two paths:

• Standard products — the filter types listed above are available as defined product families.
• Custom designs — the site emphasizes custom RF filters and custom magnetics, so non-standard frequencies, form factors, or environmental requirements are the core business rather than an exception.

For crystal products specifically, the site notes SMD and through-hole packages meeting requirements "from consumer standards up to military and space specifications," so package and screening level are part of what you specify.

The Filter Builder

The site's main interactive entry point is a Filter Builder, linked from the homepage alongside "View our products." If you already know your target frequency response, this is the intended starting point for scoping a filter; if you don't, browsing the product categories first will tell you which filter technology fits your band, power level, and selectivity needs.

When Filtronetics is worth contacting

• You need a passive RF filter, EMI filter, or magnetic component rather than an active RF chain.
• Your application is in space, defense, medical, or industrial equipment where reliability and thermal stability matter.
• Your requirement falls outside standard catalog values and needs custom design.
• You need crystal or oscillator products at military or space screening levels.

If you only need a low-cost commodity filter with no environmental or reliability requirements, the custom-design focus here may be more than your application needs.

Filtronetics (filtro.net) organizes its RF filter offering into nine product categories and provides a Filter Builder entry point for custom design work. If you already know the filter type you need — cavity, ceramic, crystal, SAW, LC/microwave, or monolithic — go straight to that product page for specifications. If your requirement is defined by performance targets rather than a technology, start with the Filter Builder and let the design process narrow the options. Custom design and manufacturing is the company's core business, so the site is built around moving from a category page (or a custom request) to an engineering conversation.

What the site offers

Filtronetics describes itself as a custom designer and manufacturer of passive RF components, EMI filters, and magnetics. The homepage presents two primary paths:

• View our products — browse the nine filter and component categories.
• Go to Filter Builder — begin a selection or custom design flow.

The company states its filters are used in Space, Defense, Medical, and Industrial systems, and that its engineering staff covers electrical engineering, CAD, hi-reliability design and manufacture, physics, applied mathematics, and mechanical engineering. Certifications are referenced on the page but not itemized in the available material, so confirm specific qualification requirements (for example, space or military screening) directly during the design conversation.

Product categories and what each is for

Use this table to match your application constraint to a starting category. Descriptions below reflect how Filtronetics characterizes each product line.

Each category page has a "More information" link leading to further technical detail.

Choosing between browsing and the Filter Builder

The decision is straightforward:

• Browse product pages first if your design already specifies a technology — for example, a narrowband IF stage points to crystal, a compact harsh-environment device points to SAW, and a high-power transmit path points to cavity.
• Start with the Filter Builder if you have performance targets (frequency, bandwidth, selectivity, power, environment) but no fixed technology. The builder is the site's intended path for selection and customization, and it feeds into the same custom design service.
• Go directly to custom design if your requirement spans multiple component types — for example, a filter plus custom magnetics plus EMI suppression — since Filtronetics positions custom design and manufacture as its core offering rather than a catalog-only business.

How to work through a custom request

1. Define your electrical targets. Frequency range, bandwidth, insertion loss budget, selectivity/rejection requirements, and power handling. These are the inputs that determine which filter technology is viable.
2. Define your environment and qualification needs. Space, defense, medical, or industrial; thermal range; ruggedness; and any military or space screening. Filtronetics explicitly lists hi-reliability design and manufacture as a staff competency, and its quartz crystal line spans consumer through military and space specifications.
3. Enter the flow via Filter Builder or the closest product page. Use the builder if technology is open; use a category page if it is fixed.
4. Expect an engineering exchange, not an instant quote. The site presents custom design as an engineering service supported by a technical staff. The available material does not describe pricing, lead times, minimum order quantities, or online ordering, so treat any commercial terms as something to confirm with the company.
5. Verify certifications for your program. The homepage references certifications but does not list them in the available content. If your program requires specific certifications, request them explicitly.

Common sticking points

• Assuming the Filter Builder produces a finished, orderable part. It is an entry point into selection and custom design; the site does not indicate automated pricing or checkout.
• Picking a technology before defining the environment. A filter that meets electrical targets but not the thermal or reliability requirements will not survive qualification — check the environment criteria alongside the electrical ones.
• Overlooking the non-filter lines. Custom magnetics, oscillators, and quartz crystals are part of the same catalog, which matters if your bill of materials spans several of these categories.
• Treating "custom" as a fallback. For Filtronetics, custom design is the primary offering, so a non-catalog requirement is a normal starting point rather than an exception.

For anything not covered on the site — pricing, lead time, specific certifications, or whether a given specification is achievable — the product pages and Filter Builder are the entry points, and the next step is contacting the company's engineering staff directly.

Yes. Filtronetics states directly on its site that its custom RF filters "perform where it matters most: in Space, Defense, Medical, and Industrial systems." The company describes itself as an industry leader in the custom design and manufacture of passive RF components, EMI filters, and magnetics, and it backs that positioning with a stated high-reliability design and manufacturing capability plus an engineering staff spanning electrical engineering, CAD, physics, applied mathematics, and mechanical engineering.

What the site says about demanding applications

The homepage frames the entire product line around four target environments: space, defense, medical, and industrial. That framing matters because it tells you the company is not positioning itself as a general-purpose consumer parts supplier. The relevant claims from the site are:

• Custom RF filters built for space, defense, medical, and industrial systems
• High-reliability (Hi-Rel) design and manufacture listed as a core engineering capability
• Quartz crystals offered in SMD and through-hole packages "meeting requirements from consumer standards up to military and space specifications"
• Crystal filters described as suited to "mission-critical RF signal paths"
• Ceramic filters described as ideal for "rugged environments"

Product families relevant to high-reliability use

Filtronetics lists nine product categories. Several map naturally onto space, defense, and medical requirements, though the site does not publish per-part qualification data in the material available here.

What to verify before committing to a design

The site's claims are directional, not a qualification certificate. If your program requires space-grade or military-grade parts, treat the following as the questions to put to Filtronetics directly:

1. Qualification documentation — ask which specific part numbers carry military or space specifications, and request the corresponding test data or screening records.
2. Environmental testing — confirm radiation tolerance, thermal cycling, vibration, and outgassing results if your application needs them. The site mentions rugged and space environments but does not publish test tables here.
3. Screening options — for Hi-Rel programs, ask what screening flow (for example, extended burn-in or element evaluation) is available and at what cost.
4. Custom vs. catalog — most listed categories are described as custom-built. Confirm lead times, minimum order quantities, and whether a catalog equivalent exists.
5. Certifications — the site references a certifications section. Review it to see which quality standards (for example, AS9100 or ISO) apply to your product family.

Practical takeaway

If you are scoping a space, defense, or medical RF design and need a custom filter or frequency-control component, Filtronetics is a plausible starting point: the company explicitly targets those markets and advertises Hi-Rel design and manufacturing experience. The next step is not to assume qualification from marketing language but to contact them with your specific environmental and screening requirements, then confirm which product family and documentation package matches your program.