EMI Microwave | Switched Bank Filters
 
Overview Technical Overview
EMI Microwave offers a super-component, incorporating PIN diode switches and filters into one package. The entire frequency band is divided into sub-bands, which are individually selected by the switch.
Switch bank filters are commonly used in radar systems, electronic warfare systems, ELINT/COMINT systems, etc.

The switches implement PIN-diode or MMIC technologies.  The filters implement one of the following technologies: 

  • cavity combline, for narrowband, low-loss applications
  • lumped element, for low frequency applications
  • printed circuit, for wideband, low-loss applications

Switched bank filters are available as field-removable/drop-in or connectorized/blind mate configurations, with various connector types.

As a result of our excellent capabilities in PIN diode switches, filter design, and advanced miniaturization techniques, EMI Microwave can deliver a switched bank filter as one super component, demonstrating exceptional features:

  • small form factor, (size, weight), hermetically sealed
  • fast switching speed, low insertion loss
  • cost-effective solution

EMI Microwave can custom design cost-effective switched bank filters per your specification, featuring any number of ports, at short delivery time.

The following are samples of some configurations delivered to our customers:
Models
Model No Frequency Range
(GHz)		 No. of Channels Max 
   I.  Loss   
(dB) 		 Max Switching
Speed
(nSec.)		 Max Power
Handling
(dBm)

Filter
Technology
OLD
   
Recomended Other
Specs
SBF-2182-03 2.7 º 3.3 3 8.0 100 20 Lumped Element
      
SBF-1858 0.02 º 0.4 4 7.0 30 Lumped Element
      
SBF-2631-00 4.4 º 5.84 * 1000 * Lumped Element
      
SBF-1857-01 5.5 º 18.06 6.5 30 27 Printed Circuit
      
SBF-2182-16 6.7 º 18.36 8.0 100 20 Printed Circuit
      
SBF-2114 4.4 º 15.0 7 6.0 5000 Cavity Combline
      
SBF-2271 0.02 º 1.5 9 5.0 10000 10 Lumped Element
      
SBF-2458-00 0.02 º 3.0 2x10 5.0 10000 10 Lumped Element
      

* Built-in amp, see specification.
Technical Overview

EMI offers a wide range of filters with custom design orientation.  These filters are designed in three types of technologies:
1. Cavity Combine Filters
2. Printed Circuit Filters
3. Lumped Element Filters

Cavity Combline Filters
EMI Combline Filters cover the entire 0.5 - 20 GHz frequency range, with 3 -12 resonators and bandwidth from 1% to 30%. Manufactured from highest quality aluminium by advanced CNC machinery, EMI's filters excel in low insertion loss, high selectivity, and high temperature stability. Higher temperature stability can be reached through the use of even more stable materials.

The quasi elliptic type of cavity Combline filter provides high selectivity if required, implemented by coupling the input to the output. With this type of filter it is possible to place a notch at a desired frequency at the edge of the filter skirt.

Printed Circuit Filters
EMI superior printed circuit filters cover the entire 1 - 20 GHz frequency range, with bandwidth from 10% to 50%. Printed technology is relatively easy to manufacture and replicate, resulting in compact, low-profile filters.  EMI uses temperature-stable materials to manufacture filters that maintain stability over the entire -55° C to +110° C temperature range.

EMI offers three types of printed circuit filters:
1. Low Pass Filters
2. High Pass Filters
3. Edge-Coupled Bandpass Filters. With re-entrances at approximately double the value of the center frequency, Eyal rectifies this situation by the addition of a small-sized Iowpass microstrip filter.

Lumped Element Filters
EMI's Lumped Element Filters cover the frequency range up to 2.5 GHz, with a minimum bandwidth of 5%. These filters are designed to meet any desired response according to customer specifications, including phase linearity, implemented using high Q capacitors, and either air or ferrite inductors.

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