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Written by Sadia Jahangir
24th Dec, 2022

Cell phone signal boosters are sophisticated pieces of technology. The correct one can significantly simplify your life by offering stable, reliable internet connections. The secret is selecting the best signal booster and supporting cellular antennas with enough power gain to improve your cellular service. There are several factors to consider, and in this section, we’ll talk about dB, dBi, and gain and what they all represent for signal boosters.


What is gain?

A piece of equipment is said to have gained power when the power leaving it exceeds the power entering it. Adding a signal booster to your house or place of business allows for the creation of a stronger internet signal or connection by amplifying or boosting the power of the existing signal. You can select the ideal gadget for your needs by measuring gain. Decibels are used to measure the gain.

What is a dB?

We gauge the ratio of input to output power in decibels, or dB. Not an absolute value, but a ratio. By comparing it to a predetermined scale, this device determines the strength of an electrical signal’s power level. A positive value represents the increase in power caused by amplifiers, which is measured in dB. Power loss may result from coax wires. This is expressed as minus dB.

What is a dBm?

The dBm scale is another way to assess the strength of your cellular signal. Signal strength in wire and cables as well as in your signal booster is measured in dBm, a tangible indicator of power level. The most precise measurement is this one. The signal booster that will cover the area you require will depend on the strength, expressed in dBm.

What is a dBi?

We must talk about dBi and its definition as we continue to explore the cell phone booster’s more technical features and signal gain. Decibel relative to isotrope is abbreviated as dBi. dBi is a ratio that is similar to dB. Manufacturers of antennas quantify antenna performance using dBi. This information is crucial because your signal booster ships with an antenna that has a dBi rating.

Isotropic Antenna

Isotrope, which refers to an isotropic antenna pattern, is represented by the letter “i.” Power radiates uniformly from this pattern in all directions. The isotropic antenna is a model against which gain is measured rather than an actual antenna. This hypothetical antenna has no gain at all, or a zero dB power rating. It is an image of the radio wave reflection pattern from the point source.

An isotropic antenna pattern is depicted graphically like this. The grid represents the pattern of the electricity coming from the center, while the red dot in the middle represents the point source.

How Is dBi Measurable?

A rating for an antenna may be expressed in dBi. This is the maximum power that an antenna can transmit or receive from a particular angle. This isotropic antenna has a gain of zero dB at its circumference. The antenna’s gain, or “gain dBi,” is any gain that is present outside of this region. The power in the strongest direction divided by the power that would be transmitted by an isotropic antenna radiating the same total power is another way to state this. This is the corresponding formula:

G = 10 log10 (IX / IZ)

where G is Gain, 10 log10 is the standard logarithm measure of relative power, IX is the intensity of the antenna in a single direction at a certain distance and IZ is the electromagnetic intensity of an isotropic antenna at the same distance

A dipole antenna, which is an antenna that directs signal in one direction, is frequently used by signal boosters. The dipole antenna typically has a gain of 2.15 dBi.

Antennas often have non-circularity ratings in dB and a maximum gain value in dBi. So, the stronger the antenna is and whether it can cover the region you need depends on the dBi rating.

Making a Connection to Signal Boosters

Hence, the power gain of the antenna is crucial. The electrical efficiency and directionality of the antenna are two measurements that affect this gain. You may install a powerful enough antenna to pick up or send the radio waves from the signal booster to the closest mobile phone tower by understanding how successfully an antenna transforms radio waves received from a given direction into electrical power, or vice versa. Knowing the dBi of your indoor antenna can help you install it such that it will cover the area you want an amplifier system to cover.

Using an antenna with a greater dBi ratio is an additional method. This will increase the effectiveness and strength of your cell phone booster.

How Should I Use This Information?

Many other pieces of information must be considered while shopping for a cell phone booster, and now you may have a better understanding of the significance of some of the numbers on the specs. We nevertheless advise that you discuss your specific case with one of our technicians. You will be able to follow up with their recommendations and pick the signal booster that will suit your demands once they start talking in terms of dB, dBi, and signal gain.

How can we assist?

The top seller of cell phone signal boosters is Bftsync. For use in the house, workplace, or automobile, cell phone boosters amplify 5G, 4G, LTE, and more for any phone with any carrier.

We detest dropped calls and inadequate coverage, thus our mission in life is to eradicate spotty signal one satisfied customer at a time:

  • Contact our US-based customer service at for a free consultation (ask us anything) or give us a call at 1-281-616-5786.
  • Free delivery.
  • Better signal or receive a 90-day money back guarantee.
  • All of our items come with a 2-year guarantee and lifetime technical support because we want everyone to be happy.


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