Micro Communications develops a range of waveguide and coaxial RF filters for the broadcast industry. We are proud recipients of an Emmy™ award for our industry leadership and pioneering development work in filtering digital television signals.
Micro Communications is ready to take on all filter topologies in waveguide, coaxial and strip-line versions. We have over 50 years of broadcast RF filters experience, combined with state of the art software and seasoned design veterans with commercial, broadcast and military type filter experience.
Broadcast RF Filters: Designs
Micro Communications standard and non-standard type designs include:
- Bandpass: Chebychev and elliptic types
- Bandstop or Notch types
- Low-pass: reflective and absorptive
- Bandpass absorptive
- Harmonic reflective
- Harmonic absorptive
- Receive reject
- Transmit reject
Waveguide Intermod-Notch Filters
MCi’s notch type I/M filter is designed to suppress spurious signals created in transmitters when operating in multiplex mode. The notches provide a wider rejection width than conventional traps. Low VSWR and insertion loss are provided to the visual and aural signals. All waveguide construction yields high reliability and high power handling capability.
I/M filters are normally supplied with three (3) cavities tuned to -3.58 to 4.5 and +9.0 MHz. Other traps are available on request, including those for CCIR applications.
Broadcast RF Filters: Design Features & Specifications
- Ideal for Multiplex Operation
- Suppress Unwanted Signals
- Reduce Out-Of-Band Products
- Reduce Mobile Radio Interference
- High Reliability
- All Waveguide Construction
|1.08 : 1 over passband||0.1 dB over passband||30 dB at notch frequency|
Waveguide UHF Harmonic Filters
MCI’s UHF waveguide harmonic filters are designed for use in all UHF systems. A new synthesis technique is used in the design of the corrugated waveguide low pass filters. This new synthesis method provides filters that can be constructed directly from dimensions calculated by a computer program. This reduces the amount of “fine tuning” for each individual filter and eliminates any major adjustments.
Waveguide Harmonic Filters: Specifications & Features
|VSWR||Insertion Loss||2nd Harmonic Rejection||3rd Harmonic Rejection|
|< 1.06 : 1||0.10 dB||> 40 dB||> 30 dB|
- High Power
- High Rejection
- Low Loss
- Low VSWR
- Unique Deisgn
This new technique provides for a filter with high rejection at the 2nd and 3rd harmonics. The filters are available in three standard waveguide sizes.
Standard length filters provide better than 40dB of rejection. Lower rejection (20dB) filters can be manufactured in a shorter length, and must be ordered per application. High rejection (100) dB @ 2nd are also available.
Harmonic Coaxial Filters
The MCI Harmonic Filter is designed to suppress the second and third harmonics generated by the transmitter. Achieving values greater than 40dB at these frequencies is standard practice. Each filter is individually tested and optimized. A broadband design makes the low pass filter an ideal choice for multi-channel applications. Two models cover the full UHF band for 3 – 1/8″ and 4 – 1 /16″ coax. A wide range of power levels is available in various EIA sizes. For 6 – 1/8″ EIA applications, please contact contact us.
- Low VSWR
- High Rejection
- High Efficiency
Broadcast RF Filters: Resources & Filter Product Data Sheets
For more information about MCi broadcast RF filters, please contact us at email@example.com