makor technologies

שאלות/תשובות בנושאי RFID

מה ההבדל בין כרטיס EM4100 לכרטיס EM4102 ?
In terms of electrical function, there is no difference between EM4100 and EM4102. Both RFID chips work at 125 KHz and with 64 bit RO (read only) memory size. The major difference is that EM4102 chip has gold bumps on the die, and because of this reason coil (antenna) can be directly connected to the die.  
From
Figure 6.1, EM 4100 die is first packed in a lead frame IC module then connected to the coil. The thickness of lead frame IC module is about 0.4mm. For EM 4102 as shown on Figure 6.2, the coil is directly connected (direct bonding) to EM 4102 die.  The thickness of die is about 0.2mm only and in order to do direct bonding task we have to use thinner coil.  In short, EM 4100 ISO card needs to embed thicker coil and lead frame IC module. 
Since
EM 4102 ISO card does not need lead frame IC module and use thinner coil so the card surface will be much flatter than EM 4100 ISO card. The flatter card surface means better printing quality especially when using dye-sublimation printer.  
 
לראש העמוד 
מה ההבדל בין פרוטוקול ISO14443A לפרוטוקול ISO14443B ?
ISO 14443 has two variants, Type A and Type B.
ISO 14443A was accepted by the ISO committee in 1997. It is the first ISO standard for 13.56 MHZ frequency contactless card which was developed by Mikron Austria and acquired by Phillips in 1996. Currently, ISO 14443A is the most widely used contactless standard in the world, mainly in transport applications.
The ISO14443A contactless card was originally intended to be a memory card only. However, microprocessor and cryptographic cards have been developed for Type A. The most common Type A cards are referred to as MIFARE cards.
ISO14443B contactless card was originally intended to be microprocessor version of Type A. Again, the memory and cryptographic options have been added for Type B thereby creating competition between Type A and Type B cards. The Type B cards are not as commonly deployed as Type A cards. ISO 14443B was approved by the ISO committee in 1998.
ISO 14443B has a number of advantages over ISO 14443A:
  1. Unlike ISO14443A uses 100% modulation depth, it means that the reader stops emitting the field for defined periods of time. The modulation depth for ISO 14443B is only 10% which preserves the continuity of the clock.
  2. No patents on communication coding.
  3. Communication speeds of up to 847 KHz.
  4. Adopted as a national standard by many countries, such as US, China, Japan, etc.
A third variant of the ISO 14443 standard, Type C, was developed by Sony, however, it was abandoned by the ISO/IEC committee and now is renamed as Felica.

לראש העמוד 
מה זה EIRP וכיצד ממירים mW ל-dBm?
איך מחשבים EIRP וממירים mW ל-dBm
 
 
For each 3dB increase the power doubles
For each 3dB decrease the power is halfed
 
:The following table provides an approximate conversion between dBm and mW
 
 
mW
dBm
1mW 0dBm
1.3mW 1dBm
2mW 3dBm
5mW 7dBm
10mW 10dBm
20mW 13dBm
30mW 15dBm
50mW 17dBm
100mW 20dBm
250mW 24dBm
500mW 27dBm
1W 30dBm
1.3W 31dBm
3W 33dBm
4W 36dBm
 
The radiated power is rated in either dBm or Watts. Power coming off an antenna is measured as Effective Isotropic Radiated Power (EIRP). EIRP is the value that regulatory agencies use to determine and measure power limits in applications such as 2.4GHz wireless equipment. EIRP is calculated by adding the transmitter power (in dBm) to the antenna gain (in dBi) and subtracting the cable loss (in dB).
 
For example:
    100mW device = 20 dBm
    50' LMR400 antenna cable has 3.4 dB loss
    24 dB Grid Antenna has 24 dBi gain
    The EIRP = 37.6 dBm (20 - 3.4 + 24)

The standards in North America are not to exceed an EIRP of 4Watts or +36dBm for 2.4GHz multipoint systems. Point-to-point systems may exceed this value if done properly.

.

לראש העמוד 
מה זה Mifare ?
MIFARE is a trademark of NXP Semiconductors. With more than 1 billion smart card ICs and 7 million reader components sold, MIFARE is a technology that has been selected for most contactless smart card projects and therefore, became the most successful brand within the automatic fare collection industry. In addition, the MIFARE product portfolio includes specific praoducts that are the perfect solution for other applications such as loyalty, road tolling, access management and gaming.
MIFARE is a contactless smart card technology based on ISO 14443A operating at a frequency of 13.56 MHz.
MIFARE is an open architecture platform that guarantees compatibility with current and future products. The MIFARE technology has an established customer base and the broadest range of suppliers providing multiple sources for cards and readers.
 
לפרטים נוספים: www.mifare.net
לראש העמוד 
דרונט בניית אתרים

מקור טכנולוגיות (ג. מקורטק מערכות זיהוי בע"מ), פרשקובסקי 7 ראשל"צ טלפון: 03-9507079 פקס: 03-6053633
מרחב צפון - טלפון: 054-2561550