Wireless Power FAQs

Many applications can benefit from Powercast’s RF-based long-range power-over-distance wireless charging technology. The amount of received power, the use case, antenna form factor, and charge rate must all be considered.

Low-power applications include high-function RFID sensor tags for environmental monitoring, battery recharging for wearables and other consumer devices, batteryless price tags that retailers can update electronically with UHF RFID readers, smart cards that can recharge while in use when near NFC POS readers or RFID readers, and LED-based illuminated packaging.  Smart, configurable, and controllable, Powercast’s wireless power technology can automatically activate when devices need charging and turn off when they’re done, or can deliver power continuously or on a scheduled basis.

The company has electronics manufacturers do the same with its PowerSpot transmitter that was FCC approved in 2017. helped customers solve remote wireless charging challenges in the industrial, commercial and military markets since its Powercaster transmitter was FCC approved in 2010, and is now helping consumer

A tiny Powerharvester® receiver, embedded in systems or devices, harvests RF energy sent over the air from either a dedicated transmitter, such as Powercast’s Powercaster or PowerSpot, or from anticipated RF sources such as UHF RFID readers or NFC POS readers. The embedded Powerharvester then converts the RF to DC to either directly power that batteryless device or recharge its batteries.

Powercast technology is designed for Original Equipment Manufacturers (OEMs) to embed directly in their products and systems. Powercast products can also be purchased through our distributors, Digi-Key, Mouser and Arrow Electronics. If your company is an OEM and is seeking sales support, please contact us at sales@www.powercastco.com to discuss your application in more detail.

Powercast offers a wide range of products including Powerharvester chips and modules, evaluation tools, antennas, transmitters, battery-free and rechargeable sensor tags,  RF field detecting light sticks, and Nintendo Switch wireless charging grip.

Our modules, the P1110B and P2110B, are for low volume applications and provide ease of implementation. Our chipsets, the PCC110, PCC114 and PCC210, are for high volume applications. Additional information about the chipsets is available after the completion of a Reference Design Confidentiality Agreement. Please contact Powercast directly for more information.

Yes. Powercast frequently engages in custom development projects related to RF-based wireless power and RF energy harvesting. Please contact us with details on your project and we will be happy to provide a quote.

Basic information about the PCC110, PCC114 and PCC210 chips is available here.  More detailed information is available after the completion of a Reference Design Confidentiality Agreement.

Yes, Powercast’s RF technology is capable of charging mobile phones over the air. However, delivering the power required to fully charge a mobile phone would take an unacceptable amount of time for the user, and would not be a great user experience.

There are two field regions: the near-field and the far-field. The exact boundary is debated by various types of engineers (antenna, EMC, etc.). Powercast defines the boundary as a distance of 2D squared/λ where D is the largest dimension of the transmitting or receiving antenna and λ is the free space wavelength. The near-field can be divided into two sub-regions: the reactive near-field and the radiating near-field (sometimes called the transition region). The term Mid-Field is a marketing term and likely refers to one of the near-field regions. The far field is when the RF waves begin to travel away from the antenna into the air. Powercast transmitters are far-field transmitters but can operate in the near field as well, so exact definitions become less important.

The FCC must bless any wireless technology as safe, and non-interfering with authorized telecommunications. There are two sections of the US Federal Code of Regulations that regulate RF transmission devices – Part 15 and Part 18. Part 15.247 limits both the transmitter’s output power and antenna gain. In general, transmitters operating in the 915 MHz frequency band, like a PowerSpot transmitter, along with 2.45GHz and 5.8GHz transmitters, may output up to one watt of power to the transmitting antenna (under certain conditions). Typically, this requires using an antenna with a gain of 4 (6dBi) or less. This limits the output power to 4W EIRP (output power multiplied by antenna gain). Powercast’s first, general-purpose TX91501 Powercaster® Transmitter and new TX91503 PowerSpot® Transmitter are certified under Part 15.247. Part 18 regulates Industrial, Scientific, and Medical (ISM) equipment. Typical ISM applications are the production of physical, biological, or chemical effects such as heating, ionization of gases, mechanical vibrations, hair removal and acceleration of charged particles. Part 18 requires that the transmitter generate and use the RF energy locally. Powercast has also obtained approval under Part 18 in the past for several specific products.

Unfortunately, we have confidentially agreements with the majority of our customers. The referenced customers are household consumer names and we are actively working with them and others to integrate our technology and chips into their devices and wireless charging ecosystems. As you would expect, public product announcements will not occur until they are ready for sale on the market.

Yes, the PowerSpot transmitter is currently approved in the US and Canada. We are actively working on two other designs of the PowerSpot transmitter to support Europe and Asia.

Powercast continues to provide our customers viable, practical solutions that meet governmental regulations. In 2006, we helped the military develop and deploy a wireless power application where a moving receiver required over 5W of continuous output power and a recharging range of over 20 feet. However, current regulations do not allow that level of transmission power or the high-gain beam steering antenna that was used. See FAQ #3. Powercast will continue to align its product roadmap with current and planned regulations

You can obtain our FCC details by searching our FCC ID, YES TX91503, here. You can obtain our ISED details via our IC ID, 8985A-TX91503, here.

Regulations in the United States and Canada limit the amount of transmittable power. Under the FCC Part 15, power is limited to 4 Watts EIRP, and both our Powercaster (TX91501) Transmitter and our PowerSpot (TX91503) Transmitter broadcast approximately 3 Watts EIRP each.

The received power is determined by several factors, including distance and receiving antenna performance. Available energy after conversion in the low microwatts and hundreds of milliwatts range should be expected. Please see the wireless power calculator available on our website:

Powercast’s technology enables unique applications for remote charging, and multiple devices can be charged simultaneously. The end-to-end efficiency of power transfer is not a relevant metric of comparison.

RF-to-DC conversion efficiency is as high as 75%. Please see the datasheets found on our Powerharvester Receivers page for performance graphs.

The transmitter output power is limited by government regulation, so the receiving antenna is a primary factor in operating range. Antennas with high gain provide a better range. The directional antenna provided with Powercast’s evaluation boards has a gain of 6dBi and will enable a range of 80-120 feet line of sight with the P2110B component. Our P21XXCSR-EVB Chipset Reference Design Evaluation Board has newer designs that enable greater sensitivity and range.

Powerharvester receivers are designed to work with standard 50-ohm antennas. An antenna should be matched as closely as possible to the frequency being received.

Yes. Powercast has antenna design expertise. Please contact us to discuss custom antenna development projects.

There are no user controls on the existing Powercaster (TX91501) Transmitter. The PowerSpot (TX91503) allows the user to turn it on or off. Making modifications inside of the device would be a violation of FCC and Industry Canada (ISED) regulations and would also void the product warranty.

Dedicated Powercast RF transmitters (such as the Powercaster or Powerspot) are not required to operate the Powerharvester receivers, but some other source of RF energy must be provided. The Powerharvester receivers can harvest enough energy to power themselves when near an anticipated RF source, such as a UHF RFID reader or NFC POS reader. Ambient energy from sources such as mobile base stations (i.e. cell sites) are typically not strong enough to operate existing Powerharvester receivers at a useful distance, but may apply in some scenarios. Harvesting from a mobile phone is typically more viable than harvesting from a mobile base station.

The Powerharvester receivers work independent of the type of modulation used (FHSS, DSSS, etc) by a transmitter, and can receive power from one or more transmitters using any type of modulations. The power of the signal is the primary metric for operation.

Both Powercast’s Powercaster (TX91501) Transmitter and PowerSpot (TX91503) Transmitter are certified for use only in the United States and Canada; other countries have different frequency requirements and power limitations. Powercast is actively working on other designs to support Europe and Asia. Some countries allow for demonstration or experimental use without regulatory certification.

Both the Powercaster (TX91501) Transmitter and PowerSpot (TX91503) Transmitter broadcast data as well as power. The data is currently a transmitter ID implemented using 8 bits. Future versions may include a timing broadcast for network synchronization. The data is sent using Amplitude Shift Keying (ASK) modulations and is recovered through the Powerharvester receiver in conjunction with external circuitry and a microcontroller. The data is factory-set and not user adjustable.

All devices that generate RF frequencies have the potential to interfere with other RF devices. The interference potential is dependent on numerous factors including the field strength of the unwanted signal, the frequency band of operation, and the ability of the receiver to reject the unwanted signal. The Powercaster Transmitter is FCC approved as FCC ID: YESTX91501 and Industry Canada(ISED) approved as IC: 9895A-TX91501. The PowerSpot Transmitter is FCC approved as FCC ID: YESTX91503, and Industry Canada (ISED) approved as IC: 8985A-TX91503. The 915 MHz output power is approximately 0.5w (3W EIRP) and uses Direct Sequence Spread Spectrum (DSSS) to spread the power over more than 500 kHz as required by the FCC and IC. The Powercast DSSS signal allows devices to more easily reject the Powercast signal. Powercast has done empirical testing with mobile phones, Wi-Fi devices, and 915 MHz transceivers and found no degradation in device performance at practical separation distances.

The TX91501 Powercaster Transmitter and TX91503 PowerSpot Transmitters draw about 2.5W of energy from a wall outlet, which is less energy than a typical night-light. It would take 40 transmitters to have the same total power as a single 60W light bulb.

Yes. Powercast technology is covered by numerous patents. As of 3/15/2023 we have 97 patents and 21 patents pending.

Absolutely. Powercast technology is approved for use in the United States and Canada. Our technology is based on radio waves that are also generated by many commonly used devices, including mobile phones, cordless phones, wireless sensors, security system, etc. RF energy declines as the inverse square of the distance from the transmitter, meaning it declines rapidly. A typical mobile phone user will receive far more RF energy from their own mobile phone than they will from a properly installed Powercast transmitter.

Yes. Radio waves pass through many types of materials, including walls. Walls and obstructions attenuate (absorb) radio waves, and this will slightly reduce the amount of energy available for reception. Radio waves reflect off of metal walls which greatly reduce or prohibit power transfer.

Typical induction charging solutions like charging pads and electric toothbrushes require that the power source and receiving device be in very close proximity to one another to transfer power efficiently, usually within millimeters, which is essentially zero distance. These types of solutions typically require special alignment and charging pads or cradles. Powercast’s RF-based technology provides power-over distance to one or more devices and does not directly compete with induction-based charging technologies.