Field as a driver for a passive circuit and antennae

Broken]In summary, RFID technology involves using a passive circuit with an antenna to emit a digital code at a certain frequency. This code is then received by a separate receiver and processed. The mechanism of an EM wave triggers an IC with stored information, which then drives a signal in the antenna. This allows for wireless digital signal transmission, with the reader picking up the tag's radio waves and interpreting them as meaningful data. For more specifics, refer to the Wikipedia and HowStuffWorks articles on RFID technology.
  • #1
NotoriousNick
31
0
Rfid: wondering what some more of the details are of this technology.

Put a field as a driver for a passive circuit and antennae emmitting some digital code at a frequncy, and some other receiver tuned to receive this and process..

Anyone know some more specifics?
 
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  • #2


http://en.wikipedia.org/wiki/Radio-frequency_identification"
 
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  • #3
Pretty informative, but I'm wondering how the mechanism of an EM wave triggers some IC with stored information - to drive a signal in an antennae with that info.. More of a wireless digital signal transmission question

Tx
 
  • #4


At a basic level, each tag works in the same way:

* Data* stored within an RFID tag's microchip waits to be read.
* The tag's antenna receives electromagnetic energy from an RFID reader's antenna.
* Using power from its internal battery or power harvested from the reader's electromagnetic field, the tag sends radio waves back to the reader.
* *The reader picks up the tag's radio waves and interprets the frequencies as meaningful data.
http://electronics.howstuffworks.com/gadgets/high-tech-gadgets/rfid2.htm"
 
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FAQ: Field as a driver for a passive circuit and antennae

1. How does the field act as a driver for passive circuits?

The field, or the electromagnetic field, acts as a driver for passive circuits by inducing a current in the circuit. As the field changes, it creates a changing magnetic flux which in turn generates an electric current in the circuit. This current then drives the circuit and allows it to perform its intended functions.

2. What role does the field play in antenna design?

The field plays a crucial role in antenna design as it is the medium through which electromagnetic waves propagate. Antennas are designed to efficiently convert electrical signals into electromagnetic waves and vice versa. The field is responsible for carrying the electromagnetic waves and allowing them to travel through space.

3. How does the field affect the performance of passive circuits and antennae?

The field can greatly affect the performance of passive circuits and antennae. For example, a strong and stable field can improve the efficiency and range of an antenna, while a weak or unstable field can result in signal loss and poor performance. Similarly, the field can impact the behavior of passive circuits, affecting their frequency response, gain, and other characteristics.

4. Can the field be shielded or controlled in order to improve circuit and antenna performance?

Yes, the field can be shielded or controlled in order to improve circuit and antenna performance. Shielding materials, such as metal enclosures or conductive coatings, can block or redirect unwanted fields, reducing interference and improving signal quality. Additionally, various techniques, such as impedance matching and tuning, can be used to control the field and optimize circuit and antenna performance.

5. What are some common applications of using the field as a driver for passive circuits and antennae?

The use of the field as a driver for passive circuits and antennae has a wide range of applications. Some common examples include wireless communication systems, radar and sonar systems, radio and television broadcasting, and medical imaging devices. These technologies rely on the field to transmit and receive information, making it an integral part of their design and operation.

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