# Bandpass Filters

Bandpass

Frequency Range from 500 Hz to 200 MHz

Bessel Bandpass Filters exhibit a constant time delay through the filters passband. Available packages include PCB, radial RF pins, SMT, SMA and BNC connectorized cases. These are available for RF and microwave applications including data acquisition, receivers and transmitters. Specify any center frequency from 500 Hz to 200 MHz.

Series/
Size
Number of Pole Pairs (Elements)Bandwidth Selection -3dBc
KT22 (4)3% to 10% fo
KT33 (6)3% to 10% fo
KT44 (8)3% to 10% fo
KT55 (10)3% to 10% fo
KT66 (12)3% to 10% fo

Frequency Range from 500 Hz to 1 GHz Butterworth Bandpass Filters offer a monotonic passband and stopband response. Available packages include PCB, radial RF pins, SMT, SMA and BNC connectorized cases. These are available for low frequency, 10-20 kHz RFID applications, RF and microwave applications including ADC and DAC low distortion testing, data acquisition, receivers and transmitters. Specify any center frequency from 500 Hz to 1 GHz. TTE offers a low THD (low distortion) filter option for this series. Please refer to the Part Number Derivation section below where the “T” option is mentioned. For an overview of TTE’s low THD filters please click here.
Series/ Size Number of Pole Pairs (Elements) Bandwidth Selection -3dBc
KB3 3 (6) 3% to 25% fo
KB4 4 (8) 3% to 25% fo
KB5 5 (10) 3% to 25% fo
KB6 6 (12) 3% to 25% fo
KB7 7 (14) 3% to 25% fo
KB8 8 (16) 3% to 25% fo
KB9 9 (18) 3% to 25% fo
Frequency Range from 500 Hz to 10 GHz Chebyshev Bandpass Filters contain slight passband ripple while offering a monotonic stopband response. Available packages include PCB, radial RF pins, SMT, SMA and BNC connectorized cases. These are available for RF and microwave applications including transmitters, receivers, low frequency, 10-20 kHz, RFID, ADC and DAC low distortion testing, data acquisition, receivers and transmitters. Specify any center frequency from 500 Hz to 10 GHz. TTE offers a low THD (low distortion) filter option for this series. Please refer to the Part Number Derivation section below where the “T” option is mentioned. For an overview of TTE’s low THD filters please click here.
Series/ Size Number of Pole Pairs (Elements) Bandwidth Selection -3dBc
KC3 3 (6) 3% to 25% fo
KC4 4 (8) 3% to 25% fo
KC5 5 (10) 3% to 25% fo
KC6 6 (12) 3% to 25% fo
KC7 7 (14) 3% to 25% fo
KC8 8 (16) 3% to 25% fo
KC9 9 (18) 3% to 25% fo

Frequency Range from 400 MHz to 26 GHz

Combline Bandpass Filters are available for any center frequency from 400 MHz to 26 GHz. These filters utilize Chebyshev topology. They also have a low ripple passband and monotonic stopbands. The passband ripple is ±0.25 dB typical. Combline Bandpass Filters are supplied to wide range of critical markets including communications, aerospace, radar, sonar, wireless, data acquisition, telemetry, ISM & RFID, WiFi, Bluetooth, Zigbee, GPS L1, GPS L2, GSM, PCS, UMTS and many more.

Series/
Size
Number of Pole Pairs (Elements)Bandwidth Selection -3dBc
3033 (6)1.5% to 15% fo
3044 (8)1.5% to 15% fo
3055 (10)1.5% to 15% fo
3066 (12)1.5% to 15% fo
3077 (14)1.5% to 15% fo
3088 (16)1.5% to 15% fo
3099 (18)1.5% to 15% fo

Frequency Range from 400 Hz to 6 GHz

The 315P Series of Combline Bandpass Filters is available for any center frequency from 400 MHz to 6 GHz. The passband bandwidth is 1.5% Fo. The 315P Series is supplied to a wide range of critical markets including communications, aerospace, radar, sonar, wireless, data acquisition, telemetry, ISM & RFID, WiFi, Bluetooth, Zigbee, GPS L1, GPS L2, GSM, PCS, UMTS and many more.

Series/
Size
Number of Pole Pairs (Elements)Bandwidth Selection -3dBc
315P5 (10)1.5% fo

Frequency Range from 1 kHz to 20 MHz

Elliptical Function Bandpass Filters contain passband ripple and stop peaks and zeros. Available packages include PCB, radial RF pins, SMA and BNC connectorized cases. These are available for RF and microwave applications including ADC and DAC low distortion testing, data acquisition, receivers and transmitters. Specify any center frequency from 1 kHz to 20 MHz.

TTE offers a low THD (low distortion) filter option for this series. Please refer to the Part Number Derivation section below where the “T” option is mentioned.

Series/
Size
Number of Pole Pairs (Elements)Bandwidth Selection -3dBc
Q40 or Q344 (8)10% to 70% fo
Q70 or Q568 (16)10% to 70% fo

Frequency Range from 500 Hz to 200 MHz

Gaussian Bandpass Filters are designed to pass a step function with zero overshoot and minimum rise time. Available packages include PCB, radial RF pins, SMA and BNC connectorized cases. These are available for RF and microwave applications including data acquisition, RFID, receivers and transmitters. Specify any center frequency from 500 Hz to 200 MHz.

Series/
Size
Number of Pole Pairs (Elements)Bandwidth Selection -3dBc
KG33 (6)3% to 10% fo
KG44 (8)3% to 10% fo
KG55 (10)3% to 10% fo

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### BANDPASS FILTER FORMULAS:

###### Center Frequency:

$$\begin{equation*} F_{0} \ =\ \sqrt{F”_{-3dB} \ *\ F’_{=3dB}} \end{equation*}$$

###### Low Frequency Stopband:
$$\begin{equation*} LF_{x} \ =\ \frac{\sqrt{( Stopband\ BW)^{2} \ +\ 4*( F_{0})^{2} \ -\ Stopband\ BW}}{2} \end{equation*}$$
###### High Frequency Stopband:

$$\begin{equation*} HF_{x} \ =\ LF_{x} \ +\ Stopband\ BW \end{equation*}$$

The actual stopband frequencies may vary at frequency and bandwidth extremes.

###### Time Delay:

To calculate a specific time delay from the simulated data, use the frequency of interest. Referring to the, KB4, delay simulation on page 1.5, and assuming a center frequency of 420 MHz the delay is calculated as follows:

Delay = 6.5/420*106
= 15.48nSeconds at 420 MHz

# CALL FOR ASSISTANCE

For assistance please call 1-716-532-2234 or email us at tte@tte.com