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FILTER SOLUTION EXPERT
AND CONSULTANT

Customized RF Components and Microwave

RF Bandpass Helical Filter is composed of varying numbers of resonators; normally it could be 2 to 6 sections, and the structure shape is similar to a spiral, which is also called a spiral filter. The basic structure and operation of Helical Bandpass Filter are passive components without power. Physically, an RF Helical Filter is a spiral coil surrounded by a square conductive shielding shell. One end of the spiral coil is connected to the load, and the other end remains open, Its working principle is similar to a coaxial resonator, but the length of its wavelength is much shorter because the spiral-shaped inner conductor will reduce the wave propagation speed, and the length of the wire is only a quarter of the target wavelength.

RF Helical Bandpass Filter has excellent environmental adaptability, especially the corresponding operating performance can be set for a special temperature environment. Generally, RF Helical Filter can operate from -30°C to +75°C, However, the performance can be adjusted separately for -40℃ or +85℃. In theory, due to the special manufacturing method, it can have a higher Q value performance, so in terms of insertion loss and attenuation, Has excellent performance.

RF Helical Filter is usually suitable for various frequencies between 50 MHz and 3000 MHz. Generally speaking, it is more common to be used in the form of a bandpass filter because of the structure of the Helical Bandpass Filter. It has very high design flexibility and its structure can be adjusted quickly according to the different frequency requirements to meet the needs of each bandwidth. At the same time, by increasing the number of resonators to improve the performance of the filter, It can also quickly meet the requirements of filtering performance. At present, Helical Filter has up to 6 resonators that can be achieved, and the isolation can reach above 80-90dBc.

Commonly used are the following communication product applications:

  • Wireless communication equipment: truck communication, train communication, ocean and air communication.
  • Broadcasting equipment: TV, cable TV
  • Network communication equipment: indoor TX and RX devices, walkie-talkie
  • Disaster prevention communication equipment: fire fighting, emergency broadcast
  • Equipment measurement: laboratory development, testing center experiment
  • Signal jamming: building jamming, hospital jamming, military facility jamming
7H Series RF Bandpass Helical Filter

Temwell is the worldwide expert of designing and manufacturing RF BandPass Filter. Based on over 25s experience, we supply manifold Helical BandPass Filter to fulfill our clients' expectations and also offer full range of custom RF bandpass filter service with suitable charge. Our custom RF bandpass filters are quality-guaranteed and have no any performance loss in center frequency change, bandwidth change, attenuation value-adding, size change, impedance change and connectorized design. The detail value is as bellow.
  • Center Frequency range: 42 ~ 2600MHz
  • Bandwidth range: 5 ~ 200MHz
  • Impedance: 50ohm & 75ohm
  • Attenuation value: 10dB upgrated by each pole adding
  • Size: 7H/ 7S/ 5R/ 5W

If you have demands for custom RF bandpass filter, welcome to contact Temwell anytime!

4 Main Series Introduction
Temwell 7H Series
Temwell 7H2 Series Helical Bandpass Filter
Temwell 7H3 Series Custom Bandpass Filter
Temwell 7H4 Series RF Band Pass Filter
Temwell 7H5 Series RF Bandpass Helical Filter
  • Center Frequency range: 42 ~ 1500MHz
  • Bandwidth range: 5 ~ 120MHz
  • Impedance: 50ohm & 75ohm
  • Attenuation value: 10dB upgrated by each pole adding
Temwell 7S Series
Temwell 7S2 Series Bandpass Filter Design
Temwell 7S3 Series Helical Filter
Temwell 7S4 Series Helical Bandpass Filter
  • Center Frequency range: 196 ~ 1500MHz
  • Bandwidth range: 5 ~ 120MHz
  • Impedance: 50ohm & 75ohm
  • Attenuation value: 10dB upgrated by each pole adding
Temwell 5W Series
Temwell 5W2 Series Custom Band Pass Filter
Temwell 5W3 Series RF Bandpass Filter
Temwell 5W4 Series RF Bandpass Helical Filter
  • Center Frequency range: 230 ~ 2600MHz
  • Bandwidth range: 5 ~ 120MHz
  • Impedance: 50ohm & 75ohm
  • Attenuation value: 10dB upgrated by each pole adding
Temwell 5R Series
Temwell 5R2 Series Bandpass Filter Design
Temwell 5R3 Series Helical Filter
Temwell 5R4 Series Helical Bandpass Filter
  • Center Frequency range: 200 ~ 2600MHz
  • Bandwidth range: 5 ~ 120MHz
  • Impedance: 50ohm & 75ohm
  • Attenuation value: 10dB upgrated by each pole adding
4 Main Series Size
Series \ (mm) \ PolePole(LxWxH)3Pole(LxWxH)4Pole(LxWxH)5Pole(LxWxH)
7H Series TD(15.2x7.6x12.5) TT (22.8x7.6x12.5) TF (30.5x7.6x12.5) TV (38x7.6x12.5)
7S Series TDS (15.2x7.6x7.7) TTS (22.8x7.6x7.7) TFS (30.5x7.6x7.7)
5W Series TDW (11.2x5.6x8.6) TTW (16.8x5.6x8.6) TFW (22.4x5.6x8.6)
5R Series TDR (11.2x5.6x8.6) TTR (16.8x5.6x8.6) TFR (22.4x5.6x8.6)
Temwell 7H Series Custom Bandpass Filters
Temwell 7S Series Custom Band Pass Filters
Temwell 5W Series Helical Bandpass Filters
Temwell 5R Series RF Band Pass Helical Filter


P/N Freq Range -3dB BW IL @Fo-(  )M/dB Impedance Series Type Power Height Size-Height RF Range Stock