Broadcast RF Filters - MCI Broadcast - Waveguide & Coaxial Filters

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.

Discuss Your Requirements

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

VSWR	Insertion Loss	Rejection
1.08 : 1 over passband	0.1 dB over passband	30 dB at notch frequency

Broadcast RF Intermod Filter – Product Data Sheet

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 Low Pass Harmonic Filters for Broadcast RF

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.

Waveguide Low Pass Harmonic Filters – Product Data Sheet

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.