COVID-19 UPDATE: WE ARE OPEN FOR BUSINESS

Design Your Custom Filter or Quadrature Coupler

1

Specify RF Filter Response Type:

    • If a Bandpass, specify a center frequency ( Fo )
    • If a Lowpass or a Highpass, specify cut-off frequent ( Fc )
    • If a Bandreject, specify center frequency of the notch & notch width and depth in dBa. Specify passband range above and below notch
    • If a Quadrature Coupler, only specify center frequency and specifics will then be sent back to you. They are limited in variations.
2

Develop your electrical specifications:

    • Specify minimum required bandwidth and the maximum allowable dB variation over that bandwidth.
    • Specify maximum allowable insertion loss over bandwidth.
    • Specify min. return loss or max. VSWR allowable over bandwidth.
    • Specify maximum allowable group delay variation over bandwidth if applicable.
    • Specify maximum allowable linear phase variation over bandwidth if applicable.
    • Specify stopband points or frequency ranges in MHz and dB below center frequency loss.

NOTE: Avoid creating too many stopband points. Every filter varies slightly, forcing the filter response to comply with numerous rejection points or to exactly match a preexisting or theoretical plot can cause the filter to be very expensive or impossible to build.

3

Specify expected power input and system impedance.

4

Indicate your physical and any additional requirements:

    • Specify package type, SMT, connector type etc.
    • Specify any size or shape requirements.
    • Specify operating temperature range and any expected environmental conditions the filter is expected to see and wanting to test.
    • Specify a nominal target price and quantity price breaks and desired delivery.
    • For SMT packages, specify if you want a test fixture.

NOTE: It is always helpful for us if you specify the separate above listed parameters by Importance or priority from a scale of 1-10, 1 being most important.

The more you tell us about what your needs the better we will be able to give you exactly what you need. Let us know in the comments section of the RFQ or by calling our engineering hotline: 858-259-2600.

Transform Functions

Chebychev: General purpose standard transformation which IMC designs as a default unless otherwise specified. The chebychev response provides excellent selectivity, passband flatness, and return loss.

For the more advanced requirements, other Transform functions for the typical RF filter response types can be implemented such as Butterworth, Bessel, Gaussian, 6 dB Gaussian, 12 dB Gaussian, Pseudo Elliptic, True Elliptic, Pseudo Elliptic Gaussians, Delay equalized, Linear Phase Equalized, Passband attenuation Equalized, as well as High power applications Corona & Multipaction proof, Filter banks, Multiplexers and Multibands as well as 3dB Quadrature couplers.

Specialized Filters

  • Delay and Phase Equalizers – Sharp filter rejection rolloff is always accompanied by large group delay variation. When both fast rolloff and flat group delay are needed, equalizer can be used. Sometimes multiple equalizers are needed to achieve very flat group delay and phase performance.
    • Send your requirements to us when you need both sharp roll-off and small group delay variation or flat phase. Delay equalizers can be added to almost any filter to flatten group delay and phase response by up to a 20:1 ratio, at the expense of insertion loss.
  • Amplitude Equalizers –With amplitude equalizers, additional circuitry can be applied to further flatten passband variation by lowering the high ranges of the band.
  • Absorptive Filters or Out of Band Return Loss Filters – An absorptive filter or also referred to as an out of band return loss filter can be translated as a terminated diplexer or triplexer where the out of band filter only has return loss.
  • Cable Filters – Integrated Microwave produces cable low pass filters in semi-rigid coax 0.141” to 0.25” diameters and 5GHz to 11GHz. These high-selectivity clean-up low pass filters are designed for use in aerospace,  radar and commercial applications. Cable filters can be pre-formed to custom requirements to fit between existing equipment in very contained or constricted spaces.

 

 

  • Multiplexers – Multiplexers, including diplexers or also called duplexers, contains one common input with multiple separate outputs.
    • Contiguous – Refers to two passbands being so close to each other that they meet at or near the theoretical 3 dBc lossless points of each passband. The “Crossover” frequency point being the exact point the high side of the low band and the low side of the high band meet each other. 3 dBc is the minimum theoretical crossover point because when a signal is transmitted through two passbands simultaneously, the power is divided by two which is 3 dB by definition. However, once the typical real world component losses are introduced, the loss at these points can be as much as 10 dBc despite being the theoretical 3 dBc lossless point. The more sections in each filter, the higher the crossover loss will become.
    • Non-contiguous means the passbands are separated. The theoretical overlap for a non-contiguous is anything greater than 3 dBc lossless point and is where the two filters cross over the same frequency when plotted individually.

 

  • Filter Banks – Filter Banks have multiple unique input terminals and multiple unique output terminals. Each of the filters in a bank are isolated from each other.
  • Dual bands, Triple Bands, Quadbands, Multibands – Each channel in a multiband filter has different frequency bands and are electrically connected on by the same common input terminal and electrically connected by one single common output terminal and is always only a 2-port device.
  • 3dB Quadrature Couplers – IMC designs and manufactures 3dB narrow band quadrature couplers between 3 MHz and 10 GHz.

Technology Capabilities

Available Package Options

PC Board Mount – PCB Mount options are easy to install.

Connectorized – Connectorized packages are durable and easy to install. Ideal for modularized applications.

Surface Mount – Surface Mount filters are low cost and compact size. For installation, refer to our  recommended pad layouts. We also offer test fixture for our SMT packages.

Custom Design – We can manufacture any housing shape, any mounting style, or create any PCB shape. If you have a custom shape you would like, send us a drawing or description at sales@imcsd.com or RFQ – Submit a Source Control Drawing.