Custom Frequency Helical RF Bandpass Filter – 340MHz / 522MHz

Overview

The Custom Frequency Helical RF Bandpass Filter is designed for wireless communication systems that require precise frequency selection and effective interference suppression. Using helical resonator technology, this compact RF filter allows signals within the specified passband to pass while attenuating unwanted signals outside the target frequency range.

Available in standard frequency options including 340MHz and 522MHz, this filter can also be customized to meet specific project requirements. It is suitable for COFDM wireless video transmission, UAV communication links, RF transmitters, receivers, telemetry systems, and other professional wireless applications.

With low insertion loss, reliable frequency selectivity, and flexible connector options, this helical bandpass filter helps improve RF system performance and maintain signal integrity.

Key Features

• Custom Frequency Options: Standard 340MHz and 522MHz versions, with additional frequency customization available.
• Effective Interference Suppression: Reduces unwanted out-of-band signals to support cleaner RF transmission and reception.
• Low Insertion Loss: Designed to minimize signal attenuation within the operating passband.
• High Frequency Selectivity: Helical resonator technology provides precise bandpass filtering.
• Compact Design: Small form factor simplifies integration into RF equipment and wireless communication systems.
• Flexible RF Connectors: Connector configurations can be selected according to the specific model and project requirements.
• Custom Power Handling: Standard and higher-power versions are available depending on the required frequency and design.
• Wide Range of Applications: Suitable for COFDM video links, drone communications, telemetry, and professional RF systems.

Technical Specifications

Note: The specifications above refer to the listed standard 340MHz model where indicated. The 522MHz and custom-frequency versions may have different electrical parameters, dimensions, connectors, and power ratings. Please confirm the specifications for your selected configuration before ordering.

Applications

• Wireless Communication Systems: Filters unwanted signals in wireless transmitters, receivers, and radio communication equipment.
• COFDM Wireless Video Transmission: Helps suppress out-of-band interference in COFDM-based video transmission systems.
• UAV and Drone Communication: Supports RF filtering for drone video links, telemetry, and wireless data transmission.
• RF Transmitters and Receivers: Improves frequency selectivity in RF front-end circuits.
• Telemetry Systems: Helps maintain signal quality in remote monitoring and data communication applications.
• Broadcasting Equipment: Supports frequency filtering in professional radio and broadcasting systems.
• RF Testing and Development: Provides frequency-selective filtering for laboratory testing and RF system development.
• OEM and Embedded Systems: Can be customized for integration into specialized communication equipment.

Customization Options

We provide customizable helical bandpass filters for different RF system requirements.

Available customization options include:

• Center Frequency: Select 340MHz, 522MHz, or specify your required frequency.
• Bandwidth: Customize the passband according to your system requirements and filtering targets.
• RF Connectors: Connector options can be selected according to the design.
• Power Handling: Standard and higher-power versions are available depending on the frequency and filter configuration.
• Mechanical Dimensions: Housing dimensions may vary according to the selected frequency and design.

To obtain the correct configuration, please provide your operating frequency, required bandwidth, transmitter output power, desired out-of-band rejection, and connector type.

FAQ

Q1: What is a helical bandpass filter?

A helical bandpass filter is an RF component that allows signals within a specified frequency band to pass while attenuating signals outside that band. It is commonly used to reduce unwanted interference in wireless communication systems.

Q2: What frequency options are available?

The listed options include 340MHz and 522MHz. Custom frequencies are also available, subject to design feasibility.

Q3: Can you customize the filter for my operating frequency?

Yes. We can customize the center frequency and bandwidth according to your project requirements. Please provide your target frequency range and required filtering performance.

Q4: What is the insertion loss of the 340MHz version?

The referenced standard 340MHz model specifies insertion loss of ≤1.2dB. Other configurations may have different insertion-loss values.

Q5: What is the maximum power handling capability?

Power handling depends on the selected model. Standard versions are listed with a rating of up to 10W, while the product FAQ also describes a standard 5W CW version and a custom 10W CW version. Please confirm the exact rating for your selected configuration before connecting a transmitter.

Q6: Can this filter be used with a COFDM transmitter?

Yes. It is suitable for RF filtering in compatible COFDM wireless video transmission systems, provided that the filter frequency, bandwidth, connectors, and power rating match the transmitter.

Q7: Can I use this filter with an FPV video transmitter?

Yes, provided that the transmitter operates within the filter's specified passband and its RF output power does not exceed the filter's rated power.

Q8: What information should I provide when ordering a custom filter?

Please specify:

• Required center frequency
• Passband bandwidth
• Desired out-of-band rejection
• Maximum RF input power
• Connector type
• Mechanical size requirements, if applicable

Our team can then help determine a suitable filter configuration.