"MP" SERIES MINIATURE BANDPASS FILTERS

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Details

Standard Characteristics

• Bandpass
• Broadband designs are skirt-compensated for symmetry
• 10 to 2000 MHz
• Tchebychev response standard
• Bandwidth from 3% to 100%
• Butterworth, Maximally Flat Delay and others available
• 2 to 8 Sections
• Many Available Packages
• Rugged, High Q Construction
• 50, 70 and 93 Ohm
• Operates in MIL environment, including Designs temperature, altitude, etc.
• 1.5 VSWR over Ripple Bandwidth
• Metal Packages

The MP series miniature bandpass filters provide the best combination of loss, selectivity and miniature size available today. Covering the range of 10 to 2000 MHz, these bandpass filters are available in a variety of packages, with bandwidths from 3% to 25%, and with 2 to 8 sections. Using the network structure proven in our LCS series filters, we are able to provide symmetrical skirt characteristics for the MP series filters, if required. The standard response curves are shown on the following pages. We encourage you to use the standard response monographs following, but caution that RS Microwave should be consulted for any specifications not found in these graphs. Also available in similar packages are "MB" bandstop filters, "ML" lowpass filters and "MH" high pass filters. Consult RS Microwave for your requirements.

MP series filters are constructed using standard parts in a quality intensive environment. In common with all RS Microwave products, the MP filters are built and tested in accordance with MIL-45208. Thus, the filters are delivered quickly, reliably and "to-spec". 

To help you determine the MP Bandpass filter most suitable for your application, the following data is required:

1. Maximum attenuation at center of frequency.

2. Minimum attenuation at the rejection frequencies.

3. Input and Output Impedance.

4. Minimum 3 dB Passband.

5. Minimum Ripple Bandwidth.

6. Package Constraints.

7. Special Requirements (power, delay, environment, etc.)

Use the following special monographs to choose the number of sections. Then, select your package style.

MAXIMUM INSERTION LOSS AT THE CENTER FREQUENCY

The insertion loss of MP filters can be calculated at center frequency as follows:

Maximum Insertion Loss     =   (Loss Constant) x (No. of Sections + 0.5) + 0.4

                                                                                   percent dB BW 
  
 

            LOSS CONSTANTS

Frequency MHz           Constant

• 10 - 150                 6.5
• 151 - 250              7.4
• 251 - 400              5.2
• 401 - 600              4.6
• 601 - 800              4.0
• 801 - 1000           3.2

The following formulas will help you define your percent bandwidth and other parameters needed for the use of the Monograph:

• 1)        3 dB BW = FH - FL
• 2)      Percent Bandwidth = [ (3 dB BW) / Fo] x 100

3)   A.   Normalized Rejection = (FRL - Fo) / 3 dB BW      For Frequencies below Fo

       B.   Normalized Rejection = (FRH - Fo) / 3 dB BW     For Frequencies above Fo

Instruction for using the Monographs:

1. Use the Monograph. (Percent Bandwidth)

2. Calculate the normalized rejection.

3. Align the lower edge of a ruler with the reference marker and the calculated normalized rejection frequency.

4. Read the attenuation for the proper number of sections.

To find the number of sections required when knowing the attenuation of the rejection frequencies only:

1.   Align the lower edge of a ruler with the reference marker and the lowest possible number of sections which will provide the required rejection.

2.   Read the number of sections giving the specified rejection.

INSERTION LOSS CALCULATION EXAMPLE:

Fo = 100 Mhz Percent Bandwidth = 10

Number of Sections = 5

NORMALIZE REJECTION FREQUENCY:

Calculation Example:   Required to know the Attenuation at 120 MHz

NRF = (120-100) / 10 = +2

CALCULATION:

The loss constant for a 100 MHz Fo = 6.5

Ins Loss = (6.5x (5+ 0.5) / 10) + 0.4 = 3.975 dB.

From the 10% Monograph, aligning a ruler with the reference marker and +2,  we get 41 dB for 5 sections.

• PC MOUNT: P
• SMA PLUG: S
• SMA JACK: M
• NON-STANDARD: N (PLEASE SPECIFY)
  A. FILTER TYPE

B. STYLE NUMBER

C. NO. OF SECTIONS

D. 3 DB BANDWIDTH

E. CENTER FREQUENCY

F. INPUT CONNECTOR

G. OUTPUT CONNECTOR

THE MINIATURE SERIES FILTERS ARE ALSO AVAILABLE AS:

• MH - MINIATURE HIGHPASS
• ML - MINIATURE LOWPASS
• MB - MINIATURE BANDSTOP