Resonator Cavity for Transmit Filters | Component Specifications

Product Specifications

Technical details and manufacturing context for Resonator Cavity

Definition

A resonator cavity is a key component within a transmit filter that creates a resonant circuit at specific frequencies. It functions as a frequency-selective element that allows desired transmission frequencies to pass while attenuating unwanted frequencies, ensuring signal purity and preventing interference in communication systems. The cavity is typically constructed from conductive materials such as copper, aluminum, or silver-plated brass, and its interior surface finish is critical for achieving high quality factor (Q) values. The resonant frequency is tunable within a range of 2.4–2.5 GHz, with a quality factor between 5000 and 10000, insertion loss of ≤0.5 dB, and return loss of ≥20 dB. The device operates over a temperature range of -40 to 85°C and can handle power levels from 10 to 50 W (CW, derated above 70°C). It is designed for a 50-ohm system impedance. The standard material is aluminum alloy 6061-T6 with a silver-plated interior, conforming to ASTM B221. Surface finish is specified as ≤0.8 μm Ra. Typical dimensions are 50×50×30 mm, with a weight of ≤150 g. Custom sizes are available. This component is used in transmit filters for communication systems, where it ensures signal purity and prevents interference. For any specific application, it is essential to verify model-specific values and standards with the legal manufacturer or supplier, as the listed parameters are reference ranges and may vary depending on the exact configuration and operating conditions.

Working Principle

The resonator cavity operates based on electromagnetic resonance principles. When electromagnetic waves enter the cavity, they reflect off the interior walls, creating standing wave patterns at specific resonant frequencies determined by the cavity's physical dimensions and geometry. These resonant frequencies correspond to the desired passband of the transmit filter. The quality factor (Q) indicates the sharpness of the resonance, with higher Q values providing narrower bandwidth and better frequency selectivity. The cavity's conductive materials and surface finish minimize energy losses, ensuring efficient filtering. The resonant frequency can be tuned within a specified range to adjust the passband. The cavity's performance is stable over its operating temperature range, and it is designed to handle specified power levels without degradation.

Common Materials

Copper, Aluminum, Silver-plated brass

Technical Parameters

Parameter	Typical range	Notes & selection driver
Resonant Frequency	2.4–2.5 GHz	Center frequency tunable ±5%
Quality Factor (Q)	5000–10000	Higher Q for narrowband filtering
Insertion Loss	≤0.5 dB	At center frequency
Return Loss	≥20 dB	Over operating band
Operating Temperature	-40–85 °C	Performance stable over range
Storage Temperature	-55–125 °C	Non-operating
Power Handling	10–50 W	CW, derate above 70°C
Impedance	50 Ω	Matched to system
Material	Al 6061-T6	Silver plated interiorASTM B221
Surface Finish	≤0.8 μm Ra	Critical for Q factor
Dimensions	50×50×30 mm	Custom sizes available
Weight	≤150 g	Depends on configuration

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Cavity Body
Forms the main resonant structure with precise internal dimensions

Material: Copper or aluminum
Coupling Iris
Controls electromagnetic energy transfer into and out of the cavity

Material: Same as cavity body
Tuning Screw Part
Allows fine adjustment of resonant frequency by changing cavity volume

Material: Brass or stainless steel

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Transmit Filter

View system integration details

Manufacturers of Resonator Cavity

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Frequently Asked Questions

What is the typical resonant frequency range of this resonator cavity?

The resonant frequency is tunable within a range of 2.4–2.5 GHz, as listed in the reference parameters. However, the exact frequency for a specific model should be confirmed with the manufacturer or supplier.

What materials are used for the resonator cavity?

The cavity can be made from copper, aluminum, or silver-plated brass. The standard material on file is aluminum alloy 6061-T6 with a silver-plated interior, conforming to ASTM B221. Other materials may be available depending on the application.

What is the significance of the quality factor (Q) in this component?

The quality factor (Q) indicates the sharpness of the resonance. A higher Q value (5000–10000) provides narrower bandwidth and better frequency selectivity, which is beneficial for narrowband filtering applications.

What are the operating temperature and power handling limits?

The operating temperature range is -40 to 85°C, and the storage temperature range is -55 to 125°C. The power handling is 10–50 W continuous wave (CW), with derating above 70°C. These values should be verified for the specific model.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Atmospheric to 2 bar
other spec:	Frequency stability: ±0.01% over temperature range
temperature:	-40°C to +85°C

Resonator Cavity

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