Radio frequency antenna

An interesting conductometric application described by Baughman et a. [726] was a radio frequency antenna coated with a CP film and responding to external, remote radio frequency interrogation. As the conductivity of the CP film changed, in... 

Radio antennas Radio astronomy Radioautogiaphy Radiochemical analysis Radiochemical technology Radiofibrosis Radio frequency... 

An innovative companion technology to SVE is radio frequency heating of the soil (42,43). Heating the soil increases the volatilization of the containments which are removed by SVE. Antennae are installed near the center of the contaminated area the radio frequency energy appHed through the anteimae heat the soil to target levels of 100 to 150°C. 

UV curable flexo ink for RFID antennas Radio frequency identification (RFID) devices and contactless smart cards are capable of uniquely identifying an individual or object when they are interrogated by an external radio frequency signal. Recently, a process of printing with the use of UV curable conductive flexo inks has been introduced. The inks are based on polyfunctional acrylates with silver flakes added for the electrical conductivity. The advantages of these inks are ... 

Sangoi, R., Smith, C. G., et al. (2004), Printing radio frequency identification (RFID) tag antennas using inks containing silver dispersions, J. Dispersion Sci. Technol. 25(4), 513-521. 

The generation, transmission and reception of radio frequency, or RF, energy can give rise to all sorts of complicated computations and special considerations of physical laws and principles, but on the surface, the general procedure looks very easy. (Fig. 52) RF energy is generated in a transmitter of some type and is coupled to an antenna. The resultant waves spread out from the antenna and eventually arrive at a receiving antenna. This is attached to a receiver whose circuitry is sensitive or resonant to the particular fre-... 

Working with an NMR spectrometer is slightly more difficult than, for instance, with an electron microprobe. As the NMR frequencies are all in the radio frequency range, NMR spectrometers are computer operated radio transmitting and receiving systems controlled by a computer. A receiver and transmitter antenna surrounds the sample, which is located in the cavity of a super-conducting cryomagnet. 

A third important application for printed electronics is the Radio Frequency Identification tag, or RFID-tag in short. This tag, the follow-up of the barcode, is a transponder, consisting of a small chip and an antenna. The antenna is... 

Mass-produced tire-pressure monitoring systems perform these functions by using battery-powered wheel electronics that are able to measure the air pressure and temperature inside the tire. Together with coded information for individual wheel identification and data about battery lifetime, these values are transmitted as radio frequency data messages to an RF antenna mounted in the wheel arch. The data messages are sent independently by all the wheel electronics in a certain time-slot pattern or extracted on demand by using a transmission trigger. A central control unit evaluates the data, identifies the tire, and decides whether the driver should be informed. Each tire is monitored separately. The related air pressure is converted to the standard pressure by means of a temperature characteristic. 

On a practical level, while designing the PCB (printed circuit board), we have to be cautious in not putting too much copper at the switching node. Otherwise it becomes an effective electric-field antenna, spewing radiated radio frequency interference all around. 

The microprocessor handles all of the housekeeping chores for the keyboard and display, deals with conunand and control signaling with the base station, and iso coordinates the rest of the functions on the board. The ROM and flash memory chips provide storage for the phone s operating system and customizable features, such as the phone direaory. The RF and power section handles power management and recharging, and also deals with the hundreds of FM channels. Finally, the RF (Radio Frequency) amplifiers handle signals in and out of the antenna. 

A Radio Frequency Identification (RFID) antenna was placed in the central unit to detect when items are removed, flashing up a warning on a touch screen when the stock is incomplete. This also facilitates the restocking process as the technology can display exactly what is missing, and the expiry date. 

Keskilammi M, Sydanheimo L, Kivikoski M (2003) Radio frequency technology for automated manufacturing and logistics. Part 1 passive RFID systems and the effects of antenna parameters on operational distance. Int Adv Manuf Technol 21 769-774... 

The integration of antenna diffusion, reducing identifiable Radio Frequency hot-spots and improving signal connection ... 

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