Dear Yesan Sellan Sir,
Please find below the key differences between HF & UHF technology in our
point of view as a RFID Technology hardware manufacturer. Fundamentally we
feel that if a body like NISO has suggested to use HF as a standards then
UHF should not be used. Also from ratio of current installations across
India, it is very easy to judge which technology is appropriate and widely
used.
A) Limitations & Benefits of using UHF (865-867 Mhz) in Library and Campus
Environment:
1. Anti-theft: Security Bit not possible in UHF tags. Database should be up
all the time for securing an unissued library item.
2. Read-Write capability with data locking not possible with standard UHF
tags.
3. Data-rewrite in UHF tags not more than 10000 times.
4. Standard EPC Gen2 UHF tags come with only 96 bit of memory and doesn't
have a factory inbuilt unique UID.
5. UHF technology is more prone to metallic interference compared to HF.
6. Standard EPC Gen2 UHF technology is widely used for warehouse & supply
chain management applications and has few OEMs who support range of
hardware for library application.
7. UHF Smart cards are generally not used for Campus applications due to
patron privacy concerns.
8. UHF technology is more directional in nature i.e. read range in one
orientation will be more pronounced compared to other orientation. Giving
unstable performance.
9. Read distance in a given direction with UHF tags is up to 2m which is
more than HF tags.
10. UHF tags are comparatively cheaper than HF tags since the available
memory capacity is less.
B) Benefits & Limitations of using HF (13.56 Mhz) in Library and Campus
Environment:
1. NISO (National Information Standards Organisation) recommends HF (13.56
Mhz) platform for use of RFID in libraries.
2. An ISO 28560 specifically for use of RFID in Libraries is based on use
of HF technology.
3. HF (13.56 Mhz) to date has been most commonly used platform for RFID
applications in Library. And multiple OEMs , Vendors, System Integrators
are available worldwide to support the large installed base of HF (13.56
Mhz) systems in Libraries.
4. EAS bit (electronic article surveillance) is feature of Phillips I-Code
SLI HF (13.56 Mhz) tags. It allows the library security system to work even
if the ILMS Server system is offline.
5. Standard HF tags used in library environment have an inbuilt unique UID
and memory options of 1024 / 2048 bits with read-write & data locking
capability.
6. Phillips I-Code SLI chips have data-rewrite capability of at least
100000 times & data retention of 10 yrs.
7. HF frequency allows for omnidirectional identification and is less prone
to metallic interference compared to UHF technology which is directional in
nature.
8. Cost of hardware is low in Implementing HF technology compared to UHF.
9. Most widely used smart cards worldwide are based on HF technology
platform. This allows use of a common campus card for multiple applications
such as ID-cards, E-purse, Attendance & Access control, transportation etc.
10. With HF technology read distance is limited up to 1m.
Thanks & Regards
Tushar Popat
B-404, Satyamev I, Opp. Gujarat High Court,
Sarkhej Gandhinagar Highway, Ahmedabad - 380 060
Phone: +91 79 2766 5256
Mob: 081560 86160
Web: www.rapidradio.co.in, http://www.rapidradio.co.in/products.html
E-mail: tushar.popat@rapidradio.co.in
On Fri, Jul 18, 2014 at 5:52 PM, SAIACS, Chief Librarian wrote: Dear Colleagues, It is to seek your insights and valuable information on use of UHF RFID
tags
for library security system. We would like to know whether or not use of
UHF
will be harmful to human bodies? Are There Any Health Risks With Prolonged
Exposure to UHF? We are in the process of identifying suitable technology
(HF or UHF) for our library, your inputs will help us to make right choice.
Should we consider using HF over UHF?? Please share your experiences and opinions in this regard. Thanks Yesan Sellan, B.Com., MLISc., PGDLAN, UGC-NET., BCS Chief Librarian South Asia Institute of Advanced Christian Studies (SAIACS) 363 Dodda Gubbi Cross Road, Kothanur P.O., Bangalore 77, India Phone: 91 80 2846 5235/5344/ 5649, Fax: 91 80 28465412, Mobile:
91-9972348251 Website: http://www.saiacs.org/ www.saiacs.org Alternative Email:
mailto:yesans@gmail.com yesans@gmail.com or
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