CHEMANDY ELECTRONICS Suppliers of the unusual

RF Trap with Attenuators in Original FLEXI-BOX


RF Trap 400 KHz to 1 GHz
Loss @ Fc > 40 dB
Insertion Loss 16.5 ± 0.5 dB
Impedance 50 Ohms
Box Dimensions
63.5 mm x 50 mm x 30.5 mm


From GBP £29.92 + Connectors
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The price of the RF Trap with Attenuators FLEXI-BOX is dependant on the connectors required. To find the price for your connector preference or to make a purchase, select your connector requirements in the boxes beside the photograph below and then select "Add to Cart".


   [Photograph of RF Trap with attenuators showing connectors]    



The RF Trap With Attenuators is built in an Original size FLEXI-BOX on a dedicated PCB. These units can be supplied ready built and tested from Chemandy with a trap frequency of 400 KHz to 1.0 GHz. The nominal attenuation is 16.5 dB ± 0.5 dB over the 300 KHz to 3.0 GHz range, with a notch of a further 30 dB ± 3 dB at the required trap frequency and a gentle downward slope at the higher frequencies which is dependant on the capacitor value used. The input and output connectors can be selected from BNC, N and SMA. The maximum continuous input power level is +22 dBm. The following figures show the response with a trap frequency of 450 MHz.

[Insertion Loss Graph - S21 v Frequency]

[Return Loss Graph - S11 v Frequency]

A detailed circuit description of the RF Trap With Attenuators is available together with a calculator for resistor values.  If you wish to build this unit, the filter frequency can be selected as required using the resonance calculator. 

This test aid is available Ready Built or in Kit form. The Kit contains the hardware only; i.e. box, pcb, connectors, screws etc. Components are not included because they are surface mount and  it is impossible to supply the correct amount because of the 'ping' factor. Anybody who has fitted surface mount components will know that when a component is being placed with a pair of tweezers there is often a 'ping' and the component disappears into thin air. We would have to supply at least two of every component thus doubling the cost.

A selection of escutcheon drawings are available for downloading as .zip or .bmp files.

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