Waveguide Straight Sections
The S series is a straight section of rectangular waveguide which conforms to MIL-A-85 and exhibits low insertion loss and VSWR. The maximum length available is 12 feet. Exterior surfaces are painted grey semi-gloss enamel.
Waveguide Components
CMC offers a complete line of waveguide 
components including straight sections, cast and formed bends and twists and waveguide to coax adapters. Most items are available in frequencies from 1 to 40 GHz. Specialty waveguides for blind mate applications, combination rigid/flex assemblies, feeds, terminations and directional couplers are available to complete your system. All are manufactured with precision flanges and guides to meet your exact specifications.
Use the navigational menu on the right to explore our line of components.
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Diplexer
| Electrical Performance | 612275 Wideband | 611475 Narrowband |
| Passband Bandwidth, Minimum | fo +/- 180 MHz | fo +/- 320 MHz |
| Passband Ripple, Maximum | +/- 0.15 dB | +/- 0.15 dB |
| Passband Insertion Loss Maximum | 1.3 dB | 0.7 dB |
| Passband VSWR | 1.3:1 Max | 1.3:1 Max |
| 50 dB Rejection, Minimum | @ fo +/- 525 MHz | @ fo +/- 940 MHz |
| Operating Temperature Range (Full Spec) | – 30 TO 70 ° C | – 30 TO 70 ° C |
MECHANICAL SPECIFICATIONS
- Overall Length 4.75 Inches
- Input/Output WR28 Flange Pattern
- Standard Iridite/Silver Plate Finish
- Paint Option Available
Custom Bandwidths available. Call with specifications
Band Pass Filter
| Frequency Range 37- 40 GHz | |
| Ripple Bandwidth Minimum | fo +/- 175 MHz |
| Insertion Loss @ fo Max | 1.2 dB |
| Passband Flatness Max | 0.5 dB |
| Passband VSWR Max | 1.3:1 |
| Rejection @ fo +/- 525 MHz Min | 55 dB |
| Approximate Dimension | 1.87″ x 0.75″ x 0.75 |
Auto Tracking Filters
CMC Part Number 200850
CMC model 200850 has the ability to seek out, lock-on and follow an RF signal anywhere in the tuning range of 1.0 – 2.1 GHz. This unit can be offset to automatically track a local oscillator frequency. Other units are available in octave ranges up to 8.0 GHz.
| Electrical Specifications | |
| Tuning Range: | 1.0 – 2.0 GHz |
| 3 dB Bandwidth: | 4% of fo |
| 30 dB Bandwidth: | 14% of fo |
| Insertion Loss: | 1.0 dB @ fo |
| VSWR: | 1.5:1 max @ fo |
| Connectors: | Type “N” female |
| Power Required: | +15 VDC @ 0.4 A -15 VDC @ 3 A + 5 VDC @ 1A |
Programmable Filters
CMC Part Number 200300
CMC has designed and developed a Tunable Bandpass Filter capable of remote tuning by use of a digital command. The unit responds to a TTL Binary command. Over 1,000 positions of calibration are available and accuracy of +/- .15 MHz from either direction is maintained.
| Electrical Specifications | |
| Tuning Range: | 2200 – 2300 MHz |
| 0.2 dB BW: | 2 MHz (fo +/- 1) |
| 20 dB BW: | 12 MHz (fo +/- 1) |
| 30 dB BW: | 20 MHz (fo +/- 1) |
| Ins Loss: | 3.2 dB MAX. @ fo +/-1 MHz |
| VSWR: | 1.5 : 1 MAX @ fo +/- 1 MHz |
| Connectors: | SMA FEMALE |
| Power Required: | +28 VDC, +/- 15 VDC, +5 VDC |
| Logic: | TTL, 10 BIT BINARY CODE |
| Accuracy: | +/- 15 MHz |
| Size: | 19.50 X 5.50 X 3.25 INCHES |
High Power Waveguide & Coaxial Filters
High Power microwave transmitters radiate an appreciable amount of spurious output power, that is, frequency components other than the carrier frequency and the normal sideband modulation signals. It is necessary to use high power filters at the output of these transmitters that wil pass the carrier and normal modulation signals but suppress the spurious emmissions, and thus, keep them from causing interference in neighboring equipment. Coleman Micowave Company’s technical staff has vast and in-depth experience in the design and development of high power filters for radar and communications systems in waveguide and coaxial transmission lines.
Harmonic-Reflective Filters
CMC Part Number 601525
| Specifications | |
| Passband Frequency | 4.4 – 5.0 GHz |
| Insertion Loss | 0.2 dB max |
| VSWR | 1.3:1 max |
| Power | 1.5 KW CW |
| Stopband Insertion Loss | 2nd Harmonic 60 dB Min 3rd Harmonic 60 dB Min 4th Harmonic 60 dB Min |
Reflective Filters
A microwave signal contains microwave energy principally at its fundamental frequency. In addition there are undesirable multiples of that same frequency called harmonics. These higher frequency “harmonics” may be removed from the fundamental by use of a mechanical device called a Waffle Iron filter. A Waffle Iron filter is reflective by design and is a corrugated, varying impedance,waveguide filter with longitudinal slots which provide attenuation to all modes containing harmonic power.
Waffle Iron units have passband fractional bandwidths of 10-20%. Stop band attenuation is typically greater than 60 dB from the second through the fourth harmonic of the fundamental frequency.
Insertion loss and VSWR in the passband are minimal providing maximum transmission of power to the antenna. Waffle Iron designs are currently available in waveguide sizes from WR650 through WR42.
NOTE: Our engineering department is standing by to assist you with your particular design requirements.
Harmonic-Absorptive Filters
CMC Part Number 600100
| Specifications | |
| CMC Part Number | 600100 |
| Passband | 4.4 – 5.0 GHz |
| Insertion Loss | 0.22 dB Max |
| VSWR | 1.12:1 |
| Power | 10.0 KW CW |
| Attenuation | 2nd Harmonic 40 dB Min 3rd Harmonic 30 dB Min 4th Harmonic 20 dB Min |
| Flanges | UG-470/U |
Band Reject Filter – Waveguide
Ka Band Reject Filter
This filter was initially designed to isolate the fundamental transmitter out put signal from the local oscillator in high reliability Ka-BAND communications equipment. Constructed in WR42, similar to above photo, the filter exhibits low passband insertion loss and high isolation in the reject band.
Specifications are for CMC P/N 401325 are as follows:
| Specifications | |
| Reject Frequency | 19.54 GHz ± 10 MHz |
| Reject Level | 70 dB Min |
| Passband | 19.73 – 21.1 GHz |
| Passband Insertion Loss | 1.0 dB Max |
| Passband VSWR | 1.35:1 Max |