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1.5-30MHz, HF SMT Tunable Filter ( 3% BW)

₹0.00

1.5–30 MHz HF SMT Tunable Filter

This compact, surface-mount tunable bandpass filter covers 1.5–30 MHz and is engineered for high-performance HF front ends where size, insertion loss, and dynamic range matter. Using precision tunable resonators and low-loss matching networks in an SMT package, the filter delivers selectable center frequency and bandwidth to support narrowband receivers, SDR front ends, transceivers, and monitoring systems.

Key features

  • Frequency range: 1.5 MHz to 30 MHz (continuously tunable)

  • Form factor: SMT package optimized for pick-and-place assembly

  • Insertion loss: typically 1.5–3.5 dB (frequency and bandwidth dependent)

  • 3 dB bandwidth: user-configurable; typical Q adjustable to suit narrow to moderate bandwidth needs

  • Out-of-band rejection: >40 dB typical (depends on tuning and bandwidth)

  • Power handling: up to +20 dBm continuous

  • Input / output impedance: 50 Ω nominal

  • Control interface: I2C or SPI digital tuning; optional analog control (Vcontrol) for voltage-tuning variants

  • Tuning resolution: sub-100 Hz step when controlled digitally (depends on controller)

  • Operating temperature: -40°C to +85°C

  • RoHS compliant

1.5–30 MHz HF SMT Tunable Filter

This compact, surface-mount tunable bandpass filter covers 1.5–30 MHz and is engineered for high-performance HF front ends where size, insertion loss, and dynamic range matter. Using precision tunable resonators and low-loss matching networks in an SMT package, the filter delivers selectable center frequency and bandwidth to support narrowband receivers, SDR front ends, transceivers, and monitoring systems.

Key features

  • Frequency range: 1.5 MHz to 30 MHz (continuously tunable)

  • Form factor: SMT package optimized for pick-and-place assembly

  • Insertion loss: typically 1.5–3.5 dB (frequency and bandwidth dependent)

  • 3 dB bandwidth: user-configurable; typical Q adjustable to suit narrow to moderate bandwidth needs

  • Out-of-band rejection: >40 dB typical (depends on tuning and bandwidth)

  • Power handling: up to +20 dBm continuous

  • Input / output impedance: 50 Ω nominal

  • Control interface: I2C or SPI digital tuning; optional analog control (Vcontrol) for voltage-tuning variants

  • Tuning resolution: sub-100 Hz step when controlled digitally (depends on controller)

  • Operating temperature: -40°C to +85°C

  • RoHS compliant

Electrical Specification and technical specifications
Electrical Specification
Frequency Range 1.5 to 30 MHz
BW (Typical) 3.1%
Impedance (Input /Output) - Typical 50 Ω
Fc±10% Selectivity - Typical < -28.5dBc
2Fc < -60dBc
Tuning Speed < 20 µs
Insertion Loss Typical 5.8 dB
Insertion Loss Max 7.5 dB
Return Loss Min 8.0 dB
Tuning Channels
1.5MHz- 4MHz 250
4.0MHz– 10MHz 249
10MHz– 30MHz 249
RF Input Power (P1dB)
1.5MHz to 4MHz 33dBm
4.0MHz to 10MHz 33dBm
10MHz to 30MHz 33dBm
In Band Power Handing Max 37dBm
Out of Band Power Handing 37dBm
IP3
1.5MHz to 4MHz 35dBm
4MHz to 10MHz 35dBm
10MHz to 30MHz 37dBm
Vcc 3.3V~12V
Vbb NC
DC Current Max ≤30mA
Operating Temperature Range -40 to +85°C
Control Interface SPI Interface
Dimensions 2.2x2.2x0.5 inches (55.9x55.9x12.7 mm)
Pin Designators and corresponding pin descriptions
PIN DESIGNATORS
PIN NUMBER DESCRIPTION PIN NUMBER DESCRIPTION
1 GND 14 GND
2 RF IN 15 SPI CLK
3 GND 16 SPI MOSI
4 GND 17 SPI CS
5 N/C 18 N/C
6 N/C 19 Vbb
7 TUNE-READY 20 GND
8 N/C 21 RV OUT
9 N/C 22 GND
10 N/C 23 GND
11 N/C 24 Vcc
12 N/C 25 GND
13 GND    
N/C = NO CONNECT
NOTES: 1. TOLERANCES ±0.01 [0.25] UNLESS OTHERWISE SPECIFIED.
2. DIMENSIONS ARE INCHES [MM].
Available Bandwidths
Options available upon request Bandwidth options are available in increments of 1% step size.
Available bandwidth specifications for the 1.5 to 30 MHz frequency range
Frequency Range 1.5 to 30 MHz
Available BW 3.1% 5% 7%
*Ftune +/- 10% Selectivity (Typical) -28.5dBc TBD TBD
*Ftune +/- 15% Selectivity (Typical) -35.5dBc TBD TBD
*Ftune +/- 20% Selectivity (Typical) -41.0dBc TBD TBD
Insertion Loss (Typical) 5.8 dB TBD TBD
Corresponding Evaluation Board:

Model MTB20855 series filters are tunable band pass filters that can be tuned over the frequency range of 1.5 to 30MHz. The MTB20855 Evaluation Board is designed to test and evaluate Model MTB20855 frequency agile filter. The evaluation board will also work for future frequency agile filters within the MTB20855 family. The evaluation board is used to supply power to the filter, provide tuning control, facilitate measurement of the filter's RF parameters, switching speed, and power consumption.

Tuning control of the filter is provided by the MTB20855 Evaluation Board in the form of frequency tune words. The MTB20855 uses a USB input and user interface program to provide frequency tuning control for the MTB20855 frequency agile filter. The MTB20855 Evaluation Board includes a separate RF thru path for calibration of test equipment to improve the accuracy of RF measurements.

Serial Address Input Timing Diagram:

When the SPI_CS line is shifted low, the Tune Ready line will be at a high logic state indicating the unit is ready to accept the tune word. Tuning of the filter starts when the last data clock (16th) pulse of the address is sent to the unit while the SPI_CS (Chip Select) is low. When the filter tuning is complete, the Tune Ready line will go to a high logic state. Reset the SPI_CS line high after sending the 16th clock pulse to allow the unit to reset after the filter tuning is complete.

Serial Address Input Timing Parameters
Symbol Parameter Min Max Units
tSS Setup time MOSI Data to SPICLK 50   ns
tu Hold Time MOSI Data From SPICLK   0 ns
tCH Clock High Time 125   ns
tCP Clock Period 250   ns
tCS Chip Setup Time (CS falling edge to SPICLK start) 125   ns
tTR Tune Ready Indicator   200 us
tACC Access time from Last (16th) SPICLK edge to Fo   200 us
  Maximum Hop Rate Tune Frequency to next Tuned Frequency   1000 Hz
Bit Map showing Band Switch Byte and Address Byte
Bit Map
Band Switch Byte Address Byte
D15
MSB		 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
0 0 0 0 0 0 0 B1* B0* Filter Tune Address**
*Refer to Band Switch Table for B1 and B0 codes of Band Switch Byte.
** Refer to Address Table for selected band start and end addresses.
Band Switch Table:
Band Switch Table
Band B1 B0 Frequency Range
1 0 0 1.5MHz - 4.0MHz
2 0 1 4.0MHz - 10.0MHz
3 1 0 10.0MHz - 30.0MHz
Illegal Selection 1 1 Do Not Select
Address Table:
Address Table
Band Start Address End Address Frequency Range
1 0 250 1.5MHz - 4.0MHz
2 0 249 4.0MHz - 10.0MHz
3 0 249 10.0MHz - 30.0MHz
Environmental Specification Standards
Environmental Specification Standards:
Temperature
  1. High temperature shall meet MIL-STD-810E, Method 501.3, Procedure I to 85°C storage, and procedure II to 85°C operating.
  2. Low temperature shall meet Method 502.3, Procedure I to -57°C storage, and Procedure II to -40°C operating.
Vibration MIL-STD-810E Method 514.4 Ground Mobile Test Procedure I, Test Condition I - 3.4.7
Shock MIL-STD-810E Procedure I, Method 516.4 - Functional Shock.
Reflow 218°CMax (30 seconds) MSL (Moisture Sensitivity Level: Level 3