Product Details

Frequency Doubler


Radio Frequency Doubler:- About, Types, Application, Design:

Radio Frequency Doubler, are RF devices that generates an output frequency, which is double the frequency of input signal frequency.

  • Doubling of Frequency is achieved by using a non-linear circuit to emphasize the first harmonic signal and distort the fundamental frequency of the input RF signal.

It is easy and economical to manufacture a frequency doubler at a lower frequency and low power level than a high-frequency or millimetre wave range frequency doubler.

To learn more details about RF wireless communication systems, we recommend you to check the following RF and Microwave books.

To understand RF frequency Doubler in-depth, we recommend you to check the details of the following component.

In this RF and microwave frequency doubler article, we will cover,

  • What is an RF and Microwave Frequency Doubler?
  • Types of Frequency Doubler?
  • Applications of RF and Microwave Frequency Doubler?
  • Prime specifications of a Frequency Doubler?
  • RF and Microwave Frequency Doubler manufacturers.

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Design and Application

What is the RF Doubler Design concept?

RF and microwave Frequency doubler is an active or passive device with an input port for feeding the input frequency signal and it generates a frequency that is two times the frequency of the input signal.

  • RF and microwave Frequency multipliers are used for communication equipment.

An RF and microwave Frequency doubler are generally manufactured using any of the following methods.

Non-linear elements like Diodes: Non-linear devices like diodes are used to select and tune the first harmonic frequency to get the desired output frequency.

Micro-electro-mechanical (MEMS) Frequency Doubler: Micro-mechanical cantilever resonators offer high Q, low-loss for the RF doubler design. The cantilever resonator's capacitive transducer offers a radio frequency doubling effect with improved circuit performance.

Phase-locked loops Frequency Doubler: A Synthesizer with a phase-locked loop (PLL) is used to tune the output frequency to a required frequency (Double the frequency of input signal). RF signal is generated by using a voltage-controlled oscillator (VCO) and the frequency is tuned by using the feedback control circuit.

RF and Microwave Frequency Doubler types:

RF and microwave Frequency doublers are of active and passive types. This classification of the RF doubler is based on the internal components used in the design of the RF and microwave frequency Doubler.

Active RF and Microwave Frequency Doubler:

Active RF and microwave frequency doublers are designed using active components like RF amplifiers to amplify the harmonic frequency signal. These devices offer the conversion gain for the output signal.

Passive RF and Microwave Frequency Doubler:

Passive RF  doublers are designed using passive components like diodes for suppression of the fundamental frequency and generating an output RF signal at the first harmonic frequency. This signal power output level from a passive RF and Microwave frequency doubler is lower than the input RF signal.

Applications of Frequency Doubler:

The property of a frequency doubler to generate higher frequencies at lower size and cost with very low additive phase noise, make it useful for many applications in the communication system domain like microwave radio, SATCOM, military radios, electronics countermeasures (ECM), and for test instrumentation.

Some of the industrial applications of the RF doublers are below.

  • RF and Microwave Test and measurement equipment.
  • Frequency modulation and Fibre optics communication.
  • SATCOM, VSAT, LMDS, and point-to-point radio Communication.
  • Microwave and Millimetre-wave communications.
  • Frequency source in Automotive systems.

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Basics & Selection Feature

Main selection specifications for RF and microwave frequency doublers:

RF and microwave frequency doublers are primarily characterized on the base of their operating frequency range, and phase noise characteristics. RF doublers are specified by their ability to suppress the input frequency and generate double frequency at the output.

RF Frequency Range of frequency doubler(MHz): 

RF frequency range of the input and the output port indicates the range of frequency that can be fed into the doubler for getting the desired output frequency. It is expressed in the MHz range. The RF connector type of the RF and Microwave frequency doubler is also a deciding factor for the operating frequency range.

Power and Dynamic Range of RF doubler:

The power handling indicates the maximum power level of the input signal we can feed into the RF doubler without damage. It will be defined as a range of lower to higher power levels and it is called the dynamic range.  For active frequency doublers, the Output Power (dBm) indicates the output signal power level from it after the frequency multiplication. It is based on the gain and P1dB of the amplifier circuit associated with the frequency doubler.

Insertion loss for passive Frequency doubler: 

Insertion loss of passive RF doubler indicates the level of signal loss when the RF signal passes from the input to the output port.

Phase noise characteristics:

Phase noise is one of the prime factors that need to consider in the selection of RF doubles as it will affect the quality of the signal in the communication systems. Lower phase noise RF doublers are better for the applications.

Harmonics and Spurious:

The suppression of the harmonic and spurious at the output of the RF doubler indicate the quality of the device.RF and microwave frequency doubler with the higher rejection of harmonics and spurious is ideal for the Microwave and millimetre wave applications.

RF connectors of Frequency doubler:

RF doublers are available in SMD and RF connectorised packages. RF and microwave frequency doublers are available with various connector options like BNC, N-type,  SMA, etc with both the polarity options. RF and microwave Designers can get custom connector options from various manufacturers.


RF and microwave frequency doublers are one of the prime components for the communication systems due to their ability to multiply the input signal frequency into a double with lower phase noise in the output.

  • In the manufactures section, you can check the list of top-rated frequency doubler manufacturers listed in RFMWC.

If you would like to recommend any further additional details about the RF and microwave frequency doubler or the details of any respective manufacturers for this page, feel free to connect with us over the contact us, or manufacturer registration button on the top of this page.

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RFMWC:-RF & Microwave Community

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