Helical filter frequency bandpass filter
Specification
Frequency: 585MHz～605MHz (other frequency can do according to your demand)
Insertion Loss: ≤1.2dB
Pass Band Ripple: ≤0.5dB
Return Loss: ≥15dB
out of band rejection: ≥40dB@Fo±50MHz
Power Rating: ≤10W
Impedance: 50Ω
Radiofrequency joint: N-KFD
Module size (mm): 89*20*32（Excluding joints）
What is a Helical Filter?
A Helical Filter is a type of RF bandpass filter that uses helical resonators as the core frequency-selective elements. These resonators are essentially coils of wire enclosed in a conductive cavity, which provide a high Q-factor and strong selectivity within a compact size. Compared with traditional LC or cavity filters, helical filters achieve excellent performance in terms of low insertion loss, sharp roll-off, and stable frequency characteristics while maintaining a smaller footprint.
Helical filters are widely used in VHF, UHF, and microwave communication systems, where they serve as critical components for suppressing unwanted signals, minimizing interference, and ensuring the integrity of the desired frequency band. Their ability to combine compact structure with high performance makes them particularly suitable for portable and space-constrained devices.
Common Application Scenarios of Helical Filters
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Wireless Communication Systems
Used in base stations, repeaters, and handheld radios to suppress adjacent channel interference and ensure clear communication. -
Satellite and Aerospace Systems
Provide reliable RF filtering in satellite receivers, telemetry links, and aerospace communication equipment where size, weight, and performance are critical. -
Broadcasting Equipment
Applied in TV and radio transmitters/receivers to isolate desired channels and prevent cross-channel interference. -
Military and Defense Applications
Integrated into tactical radios, surveillance systems, and secure communication links for stable, interference-free operation in complex RF environments. -
Wireless Video Transmission (COFDM Systems)
Ensure high-quality, low-latency video links for UAVs, drones, public security, and professional broadcasting by rejecting out-of-band interference. -
Industrial and Transportation Systems
Used in monitoring, inspection, and intelligent transportation networks to guarantee reliable wireless data transmission.
