People are putting coins on their routers; here’s what really happens

Each month an old-fashioned technological "hack" resurfaces online: Place a penny on the router's top to increase speed and improve the stability of the connectivity. It's a popular idea since it offers something captivating: a faster internet with only an extra coin. No settings, no upgrades, no cost.

However, despite its popularity experts in the field of network and technical analysis always conclude that this trick isn't really beneficial. In fact, it may even harm your device over time. The persistent nature of this story shows how easy arguments can obscure the complicated reality of wireless communications.

The Science Behind Wi-Fi Signals


Wi-Fi routers are typically operating with two bands of frequency: 2.4 GHz and 5 GHz. The 2.4 frequency band is more extensive and can pass through walls with greater efficiency, whereas 5 GHz provides faster speeds at smaller distances. The signals depend on precisely developed antennas that send and receive radio signals in a precise manner.

The study, entitled Fundamentals of Designing Antennas to Wireless Systems, conducted by the Massachusetts Institute of Technology in the United States, highlights that the antenna's performance is contingent on its exact measurements, positioning as well as the ability to tune electrically to the wavelength of the signal. The Wi-Fi wavelengths are measured using centimeters. That means even minor modifications to the antenna's design can greatly impact the efficiency.

A common coin, in the other hand, is merely the result of a random metal piece. It's not wired to the router. Nor is it designed or placed so that it can interact effectively in a meaningful way with signals from radio. If it is not integrated into the antenna, it is not able to enhance, redirect or improve the quality of Wi-Fi signals in any way that can be measured.

Why the Idea Seems Believable

A large part of the appeal is its close resemblance to actual engineering ideas. Professional wireless systems reflectors made of metallic and parasitic components can be used to alter directions of the signal. In some cases, there are DIY projects in which carefully designed metallic surfaces could increase the coverage.

But, they have been designed with care and are adapted to certain frequency. The loosely positioned coin on a casing of a plastic router does not have the necessary geometries, alignment, as well as electrical interactions. The apparent similarity of an engineered component and a coin could be enough to deceive even when specifics of the technology are not explained or included in discussions on the internet.

The Heat Myth and the Real Risk

Another variation of the assertion implies that the coin can help to disperse heat and improve the performance of routers during prolonged usage. The idea is also shattered when examined. Routers have inbuilt ventilation systems that permit natural airflow to let heat escape.

The research conducted by The thermal management in Consumer Electronics Study from researchers at the University of Cambridge in the United Kingdom shows that even tiny obstructions to airflow may increase internal temperatures and decrease the efficiency of the device. If a piece of furniture is placed in a way that blocks vents the device can be able to keep heat in place instead of dispersing it.

When temperatures increase and routers become more efficient, they may reduce performance and weaken signal strength or even temporarily stop components in order to avoid the risk of damage. As time passes, continuous heating can decrease the longevity of hardware internal to the system. Even a seemingly innocent exercise could lead to deterioration of performance, or expensive repair.

Metal and Signal Interference

Also, there is the problem of interference. Metal has been known to radiate and disperse radio signals frequently in unpredictable ways. Even though a single coin likely to cause significant disruption placing metal objects in proximity to routers is contrary to standard networking guidelines.

Guidelines for deployment of wireless generally advise placing routers in areas that are open and away from metallic surface and electrical disturbances. The addition of a coin is an additional risk to an already complex system that relies greatly on the conditions of the environment.

Why People Think It Works

The appearance of success usually results from the regular fluctuations in performance on networks. WiFi speeds may fluctuate because of channel switching devices' movements or decreased interference from nearby wireless networks.

The user could put coins to the router and see improvements in the next few minutes in the event that both devices are in contact. However, in reality, the router may simply switched to a channel that is less crowded or altered the settings within it. It's a typical case of mistaking coincidence as the reason.

What Actually Improves Your Wi-Fi

The real improvement comes from the real-world adjustments. The placement of the router is by far the most significant aspect. Its central location, high in a clear space away from obstacles will significantly increase the coverage. Beware of kitchens, big metal items, and closed areas can also help maintain the signal's stability.

The way your device switches between 2.4 5 GHz and 2.4 GHz bands could further help explain fluctuations in performance. These changes happen in a way that is automatic and are often the reason for abrupt shifts in speed or stability.

The Bottom Line

The trick of the coin-on-router is successful due to its simplicity visual and straightforward to test. However, simplicity is not the same as efficiency. Wireless connectivity is controlled by strict physical rules that can't be modified simply by putting a random item in the router.

In the best case, the coin will do nothing. It could even interfere with cooling and causes permanent damage. If you'd like to have more reliable Wi-Fi, you must focus on location, the environment and the correct configuration. The spare change should be kept in your purse rather than the router.