MIKE MEYERS COMPTIA RFID+ CERTIFICATION PASSPORT in Software

Creation QR Code JIS X 0510 in Software MIKE MEYERS COMPTIA RFID+ CERTIFICATION PASSPORT

13 Which of the following is the best tag orientation for reading UHF tags A B C D The antenna plane and tag plane are parallel to each other The antenna plane and tag plane are perpendicular to each other The antenna plane and tag plane are at 90 degrees to each other The tag axis is perpendicular to the antenna plane

14 An UHF interrogator is connected to a horizontally polarized antenna with 6 dBi gain This antenna is replaced by a 6 dBi gain circularly polarized antenna Which of the following best describes the consequences of this change A B C D A B C D The tag in the horizontal orientation cannot be read The tag in the vertical orientation cannot be read All the tags can be read The tags that were near the borderline of the IZ cannot be read The time to read one tag The time to read all the tags in the IZ The time the tag stays inside the IZ The time between two successive interrogation attempts

1 2 3 4 5 6 7 8 The integrated circuit (IC) has memory to store data The object ID is stored in this memory A LF tag antenna couples with the interrogator antenna using magnetic flux A 75 micron thick PET sheet can be used for tag substrate The ceramic sheet will be too fragile to use Cases of items are usually tagged with smart labels Semi-passive tags do not have a transmitter Passive and semi-passive tags use backscatter to communicate with the interrogator LF and HF ranges use inductive coupling HF is the best frequency range to use for objects with aqueous substances and at a distance of approximately 2 feet The LF could read

objects with aqueous substances but will not provide a read range of 2 feet 9 10 11 12 The Gen 2 specification covers the frequency range 860 960 MHz Semi-passive UHF tags provide a read range of up to 100 feet Active tags belong to EPC Class 4 The interrogator will read only two tags because it is designed for use with the Gen 2 protocol Only two tags use the ISO 18000-6C protocol, another name for Gen 2 A tag and interrogator must use the same protocol to communicate When the antenna plane and tag plane are parallel to each other, the tag is in the best orientation for reading as well as for writing It collects the maximum power The tags that were near the borderline of the IZ cannot be read because the circularly polarized antenna transmits only half the power of a linearly polarized antenna This will reduce the size of IZ to about 70 percent and the tags that fall beyond this cannot be read Dwell time is defined as the time the tag stays inside the IZ

Interrogator Functionality Interrogator Types Interrogator Antennas Interrogator Operation Interrogation Zone Configuration

An interrogation zone (IZ, shown in Figure 4-1) consists of the interrogator, antennas, cables, peripherals, and the environment in which the equipment is installed The complexity of an IZ is determined by its environment, in which the presence of multiple objects can cause reflections, absorption, or interference with the original signal These factors can cause unintentional reads, can block the intended reads, and can reduce throughput processing capability Hardware and software for an IZ must be properly selected and configured to eliminate or overcome the environmental and business procedural obstacles and limitations Before you can create a properly functioning IZ, you must understand its components This chapter starts by explaining the interrogator functionality and its components, and then it reviews various types of interrogators Next, interrogator antennas, types, polarization, and function are discussed The next part of the chapter is dedicated to interrogator operation, including air interface and data protocols, dense interrogator mode, anti-colli-

Light stack (Peripheral)