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 Connecticut Microwave filters are custom components designed to meet YOUR specific requirements.




Connecticut Microwave makes Low-Pass filters from the FM Broadcast band up to approximately 3000 MHz. These Low-Pass filters are designed for high power and are custom tailored to YOUR application.






               OAL                                                             13 9/16"
               CONNECTORS                                        DIN 7/16 MALE and FEMALE

               IMPEDANCE                                            50 OHMS
               PASS BAND                                             1.0 - 2.5 GHz
               INSERTION LOSS                 
                      PASS BAND                                       0.2 dB
                      REJECTION     3 - 10 GHz             10 dB
              VSWR                        PASS BAND          1.25:1 (MAX)
               POWER                   PASS BAND           1500 WATTS (MAX)
                                                 TOTAL HARMONIC 200 WATT (MAX)
              TEMPERATURE                                        15 - 35°C
              HUMIDITY                                                   0 - 90% REL
              ALTITUDE                                                   0 - 5000 FT MSL

Tx, Rx Multicouplers

Tx, Rx Multicouplers
Receiver Multicouplers are an essential part of today’s modern multi-channel antenna systems. There are four key components in a Receiver Multicoupler which determine its overall performance: The Preselector, comprised of cascaded bandpass filters to provide high selectivity in dense R.F. Environments. It filters unwanted signals from entering the amplifier and contributes in reducing the overall noise figure of the system. The Amplifier. In order to be effective in high R.F. environments, amplifiers must have a high third order intercept point to handle off-frequency signals of high amplitude, and be capable of handling strong signals without overloading the receiver. The Power Divider. Broadband unit to divide the received signals from the output of the amplifier to the individual receiver ports. They provide 25 dB or more isolation between each receiver port to minimize any possible interaction. The Power Supply. A 110 V AC/12 VDC source is required to drive the amplifier. Alternate power sources, preselectors and amplifiers with PIN-Diode attenuators are available to suit specific site requirements. Please consult our representative for additional information.

Cavity Filters

Cavity Filters

 Cavity Filters "BandPass", "BandRject" And "PassReject" Series

Connecticut Microwave offers a complete range of high-Q cavity filters to provide the best bandpass, reject and pass-reject responses. These resonant cavity filters are the building blocks of our duplexer and multicoupler series. 

Individual or cascaded filters may be used for a variety of interference problems, such as cleaning up the performance of existing Duplexers that have an inadequate isolation or off channel interference rejection. At crowded antenna sites, filters are ideal for quieting noisy transmitters or for preventing transmitter IM mixing. Receiver front-end selectivity can be greatly enhanced by the use of filters, thus eliminating desensitization, intermodulation, and overload problems.

The basic cavity filters are constructed of either a 6.625” aluminum cylinder or a 4"x 5" rectangular tubing, with

a coaxial inner conductor of brass and copper, silver plated to eliminate problems of noise, high loss and degraded selectivity. The use of an INVAR tuning rod results in extremely low frequency drift over the operating temperature range.

Our basic cavity filters offers the flexibility of broad system design capability with a variety of different but interchangeable coupling loop assemblies that allow our basic cavity resonator to operate in a number of filter modes, thus providing an optimum filter response characteristic for almost any applications. These coupling loop assemblies are not only interchangeable, they are also continuously adjustable within their range for various frequency separations to tailor a filter response to specific needs.

Filter convertibility solves many complex filtering and multicoupling problems with relative ease and minimum expense. Duplexer cavities can be connected into multicoupling cavities or for any other uses when the need arises. 




 Connecticut Microwave manufactures an extensive line of base station duplexers that meet industry duplexing needs In all operating ranges from 30 to 1 000 MHz. We feature several models of band-pass and pass-reject duplexers utilizing either our 7" round cavity model for greater isolation, or our "Modu-Pak Series", a 4" x 5"

rectangular cavity with similar performance when less space is available. 

Our Pass-Reject type Duplexers, featuring our unique “W” circuit  design, produce  highly desirable pass-band

selectivity, low branch losses and deep reject notches.

Through special cabling and coupling methods the “nose” response of band-pass duplexers is broader, which permits a single duplexer to serve a number of combined and multicoupled transmitters and receivers on a common antenna, provided of course, that acceptable frequency spacing criteria are met.

Two and three cavity branch duplexers are available in both band-pass and pass-reject configurations.

 Other types of duplexer options such as isolator/duplexer combinations, duplexers with more than three cavity branches and duplexer/multicoupler combinations are available on request.


Our "Modu-Pak" series of duplexers have been designed around a 4” X 5” rectangular Aluminum extrusion which lends itself to compact and innovative packaging of assemblies to meet problems of on-site equipment space availability. All duplexers are comprised of individually welded cavities to eliminate leakage, intermod problems and system degradation commonly found on interlocking cavity type duplexers. 

These cavity resonators fulfill the needs for highly selective filtering, antenna duplexing, transmitter combining and many other land mobile systems filter applications. 

All models are carefully temperature compensated for stable characteristics over their operating frequency range using compensation techniques based on the reference physical properties of INVAR, a material having almost zero thermal expansion-contraction characteristics.

Filters low Pass, Notch

Filters low Pass, Notch



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Connecticut Microwave Corporation
1486 Highland Avenue #5, Cheshire, Connecticut 06410 USA
Phone: (203) 250-9678  -  Fax: (203) 250-9688  -  E-Mail: