900 mhz antenna omnidirectional.Technical specifications of coaxial attenuators

　　The technical specifications of coaxial attenuators include the operating frequency band, attenuation amount, power capacity, return loss, etc.

　　1. Working frequency band: The working frequency band of an attenuator refers to the use of the attenuator within a given frequency range in order to achieve the specified value. Due to the frequency dependence of RF/microwave structures, components in different frequency bands have different structures and cannot be interchangeable. The working frequency band used in modern coaxial attenuators is quite wide, and attention should be paid to it in design or use.

　　2. Attenuation: Regardless of the mechanism and specific structure of the success rate attenuation, the attenuator can always be described using the two port network shown in the following figure. The power at the signal input end is P1, while the power at the output end is P2, and the power attenuation of the attenuator is A (dB). If P1 and P2 are expressed in decibels milliwatts (dBm), then the relationship between the power at both ends is P2 (dBm)=P1 (dBm) - A (dB). It can be seen that the attenuation describes the degree to which the power decreases after passing through the attenuator. The magnitude of attenuation is determined by the material and structure that make up the attenuator. The attenuation is measured in decibels, which is convenient for calculating the overall performance of the machine.

　　3. Power capacity: An attenuator is an energy consuming component that converts power consumption into heat. It can be imagined that after the material structure is determined, the power capacity of the attenuator is determined. If the power borne by the attenuator exceeds this limit, the attenuator will be burned out. When designing and using, power capacity must be clearly defined.

　　4. Return loss: The callback loss is the standing wave ratio of the attenuator, which requires the input and output standing wave ratios at both ends of the attenuator to be as small as possible. The attenuator we hope for is a power consuming component that cannot have an impact on both end circuits, meaning it is compatible with both end circuits. When designing attenuators, this factor should be considered.

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