What is the Difference between Active RF Components and Passive RF Components?


What is an RF passive component?  
An RF passive component refers to an RF component that does not require an external power supply. As long as the signal or energy passes through the component, it can automatically distribute, couple, and filter the RF signal, but it cannot amplify or additionally controlled jobs to the signal.

What is an RF active component?
An RF active component refers to an RF component that needs to be supplied with an external power supply. Because of the energy support, the component can work in amplifying, modulating, and oscillating to the signal. The RF signal through the change of the supplied energy could result in higher output power, better noise reduction performance, and wider bandwidth on purpose.
The Difference BetweenActive Filter Components and Passive Filter Components

The biggest difference between passive RF filter components and active RF filter components is whether they require an external power supply. The control of the power supply is added, so that the component can actively control the signal, and even manipulate the signal to achieve the desired result. In other words, RF active components are highly manipulable, and RF passive components can only passively wait for the result.

Comparison between Active Filters and Passive Filters
In addition, another important difference is cost and complexity. Since active RF components require an additional power supply and additional collaborative design, the cost is relatively high, and the structure and design are relatively complex. Also because of the high complexity, the possibility of problems also increases, so the reliability is more difficult to control. Generally speaking, RF engineers will choose the most suitable way to design the RF system according to the actual design requirements.

Temwell RF Passive Components Can Work Alone without Power
A passive RF filter refers to a component that uses parts without power to form a filter function and does not require an additional power supply to achieve signal filtering. The most common filters are passive RF components, which can perform basic filtering of RF signals without installing active power control, including passive low pass filter, passive high pass filter, passive band pass filter, and passive band stop filter. Passive RF filters are often used in applications such as wireless communications, broadcasting, and Radar.

Passive RF filters perform passive signal processing for specific frequency bands through structural design. As long as a signal passes through the passive RF filter, the filter can automatically distribute, couple, and filter the RF signal.

Passive RF filters can be implemented using a single passive component, such as a signal rejected function achieved by a single inductor or a signal system based on a single capacitor. Multiple passive components can also be used to build a higher performance filter circuit, such as LC, RC, RLC filters, etc. composed of passive components such as capacitors, inductors, and crystals. Passive RF filters are simple in design, easy to use, low in cost, and highly stable, making them less to damage except by non-human destruction. It can properly and continuously play the expected operational goals.

Temwell RF Active Components Work with Power Source
Active RF filters refer to components that use special electronic circuits such as IC, transistors, and amplifiers to implement RF filter functions. These special electronic circuits need to contain power supply energy to function properly, so they are called active RF filters. The most common Active RF filters include active low pass filter, active high pass filter, active band pass filter, and active band stop filter. Because of the introduction of electronic circuits such as IC and transistors, active RF filters can provide more parameter selection and design flexibility, so that the final product goal can be better achieved.

The design of passive filters is often limited by the capabilities and physical properties of raw materials. The achieved performance and realization ability of the filter can only reach a certain range. In order to break through such ceiling restrictions, RF engineers use special electronic circuits such as IC, transistors, and amplifiers to realize the functions of RF filters, and at the same time, they can achieve better parameter performance of filters and provide a larger applicable range of filter designing.

Active RF filters can achieve more parameter characteristics and provide greater design changes, so they can be used in a wider range of different wireless communication, satellite communication, and digital communication fields. Compared with passive RF filters, active RF filters have higher gain and better selectivity, enabling more complex filtering functions and higher performance. However, active RF filters are typically more complex and costly than passive RF filters and are prone to additional noise and distortion.


Temwell Group is an expert dedicated to the development and production of RF filters and Microwave components. The R&D team has 25 years of rich experience and skills in development and design. According to various requirements and project goals of customers, it can professionally customize all kinds of Advanced RF filters and RF components, to provide customers with high-quality, high-efficiency, high-satisfaction products.

Whether it is passive RF filter design, including RF Cavity Filter, RF Helical Filter, RF DR SMD Filter, and RF Saw SMD Filter in Bandpass Filter, Highpass Filter, Lowpass Filter, and Bandstop Filter, as well as various passive RF components, such as Duplexer/ Diplexer, Multiplexer, Splitter/Divider, Combiner, Attenuator, Isolator, Circulator, Coupler, and so on. At the same time, we can also provide professional active RF filter design services. The products include Amplifier, Power Amplifier, Low Noise Amplifier, etc.

Temwell Group focuses on customer needs, continuously improves R&D capabilities, launches innovative products, and enhances product quality. It has provided customers with efficient customized product specification services for 20 years, and has become a leader in the field of RF filters and Microwave components. Widely praised and trusted by customers. 
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