Selected articles for topic: rfid tag distance range
→ 433 articles
Check also 14 Videos for this topic
rfid tag – jasminetrias.org
rfid tag solutions tags are types of wireless sensors reader writer passive range .
rfid tag temperature range reader software price .
rfid tag cost range uhf kaufen .
rfid tag china 860 960mhz uhf waterproof with...
Website:
http://jasminetrias.org
Semi-passive RFID Tags - AutoID | Passive Tags | Active Tags
Types of RFID Tags
RFID Tags come in three basic varieties: passive, active, or semi-passive or battery-assisted. RFID Tags and Readers are available in a range of different frequencies with 125kHz, 13.56MHz, 868MHz and 915MHz being the most common frequencies.
Passive RFID Tags: A Passive RF Tag requires no internal power source and generates no RF signals itself. Passive RF Tags are powered by readers when they are in range. They inherit...
Website:
http://www.rftags.co.za
Related topics : how much do active rfid tags cost / passive rfid tag and reader / active rfid tag and reader / passive rfid tag circuit / battery assisted passive rfid tag cost
Advantages and disadvantages of active RFID tags | Oprfid.com
An active RFID tag is one in which battery power is used to supply power to the electronics. This enables greater distances to be achieved as the tag is not dependent upon the received power to provide a reflected signal, and the control and processing circuits can be more sophisticated as in the case of the...
Date: 2017-11-14 02:50:39
Website:
http://www.oprfid.com
Related topics : active rfid tag battery life / active rfid tag range / active and passive rfid tags / semi active rfid tags / active rfid tag distance
RFID Applications and Challenges | IntechOpen
RFID reader can access data of RFID tag and transmit the content from RFID tag to middleware which is a necessary component in RFID application system. The middleware is also the interface software that connects new RFID hardware with legacy enterprise IT systems [ 36 ]. Middleware is used to route data between the RFID networks and the IT systems within an organization. It merges new RFID systems with legacy IT systems.
RFID Reader is also called Interrogator. The RFID reader can read and write data of RFID tag via radio frequency. RFID readers can classify serial reader and network reader according to connection...
Website:
intechopen.com
RFID tags, RFID readers, RFID solutions - ESSEN RFID india
over barcodes
�
Barcode readers require a direct line of sight to the printed barcode; RFID readers do not require a direct line of sight. This applies to passive RFID tags and RFID solutions which can be customized to cater to the RFID India market.
A barcode read range is not more than five to ten feet. RFID tags can be read at distances of up to 50 feet. Xtenna[TM] based RFID can read RFID...
Date: 2015-02-17 12:23:59
Website:
http://www.essenrfid.com
RFID tags, RFID readers, RFID solutions - ESSEN RFID india
over barcodes
�
Barcode readers require a direct line of sight to the printed barcode; RFID readers do not require a direct line of sight. This applies to passive RFID tags and RFID solutions which can be customized to cater to the RFID India market.
A barcode read range is not more than five to ten feet. RFID tags can be read at distances of up to 50 feet. Xtenna[TM] based RFID can read RFID...
Date: 2015-02-17 12:23:59
Website:
http://www.essenrfid.com
Related topics : passive rfid tag read range / rfid tag read range / read write rfid tags / rfid tag reader long range / passive rfid tag and reader
Advantages of RFID Versus Barcodes - Technovelgy
Advantages of RFID Versus Barcodes
RFID tags and barcodes both carry information about products. However, there are important differences between these two technologies:
Barcode readers require a direct line of sight to the printed barcode; RFID readers do not require a direct line of sight to either active RFID tags or passive RFID tags .
RFID tags can be read at much greater distances; an RFID reader can pull information from a tag at distances up to 300 feet. The range to read a barcode is much less, typically no more than fifteen feet.
RFID readers can interrogate, or read, RFID tags much...
Website:
http://www.technovelgy.com
Related topics : passive rfid tag read range / active rfid tag read range / rfid active reader passive tag / read write rfid tags / rfid tag read range
RFID Tags | Manufacturers of RFID Tag Products
RFID inlays from the top RFID inlay manufacturers
What are RFID Tags?
The term "RFID Tags" is often used as a general term to describe not only RFID Tags but RFID Labels and RFID Cards. It is important to know which frequency your RFID solution operates at and what type of product the tag be affixed to before searching for a RFID tag. If your application is to track a metal tote you would want a RFID tag that is designed to be mounted on a metal surface (Metal RFID Tags). If you need additional information on a particular product please click on the "Request Info" link next to the product.
UHF (Ultra High Frequency) Tags, Labels and Cards operate at a...
Website:
http://www.rfidtags.com
Related topics : passive rfid tag uses / hf rfid tag on metal / passive rfid tag frequency range / hf rfid tag frequency / uhf rfid tags frequency
rfid tags for clothing, rfid clothing tag, rfid tag for ...
RFID Tags for Clothing Run Through the Whole Supply Chains of Apparel Industry
RFID Tags for Clothing News-August-29-2013
The apperance of RFID tags for clothing has vastly improved the speed of data collection, especially in the moving process. The features, like unique ID of information carrier and the fast info reading and store, determine that RFID tags for clothing are able to function more...
Date: 2017-02-14 13:13:14
Website:
rfid-in-china.com
Related topics : rfid clothing tags / rfid tag read range / rfid tag production process / rfid tag production cost / rfid tags product tracking
Uhf Rfid Rfid Reader Module For Arduino Or To Raspberry Pi ...
Air�cooling(no�need�for�out�install�cooling�fin)
�
Product Picture:�
Company Information
Shenzhen Vanch Intelligent was established in2005, one of the earliest UHF RFID products manufacture and application solutions supplier in China.VANCH products were widely used in City Smart transportation, Electric power system, asset and logistics management, the world's top 500...
Website:
alibaba.com
HF RFID tag | High Frequency 13.56 MHz RFID Tags
HF RFID tag
HF RFID (13.56 MHz)
The HF inlay and tag has been widely applied, this is a more mature and most dynamic industry.
HF Tags, Labels and Cards operate at a frequency of 13.56 MHz. These types of tags are also "Passive" - no on board power source. 13.56mhz passive rfid tags applications that use HF RFID tags are...
Website:
https://makarfid.com
Related topics : hf rfid tag frequency / hf rfid tag on metal / hf rfid tags / high frequency rfid tag / passive rfid tags applications
rfid stock tracking tag, rfid stock tracking tags, rfid ...
RFID Stock Tracking Tags Streamline and Optimize the Stock Management
RFID Stock Tracking Tags News-June-05
At present, RFID stock tracking tags have been used into inventory control, a core part of logistics, creating great significance in promoting the overall competitiveness of enterprises. Modern inventory control involves a large number of complicated products, which requires high-tech tools...
Date: 2017-10-23 14:09:17
Website:
rfid-in-china.com
RFID FAQs | HID Global
In general, an RFID Tag represents memory that can be written in any data format. Some chips are more capable than others, e.g. by providing a file system or reserved memory areas for certain standardized pieces of data. Many proprietary formats exist on the market, but there are also some standardized formats that allow interoperability between tags, readers and applications from different...
Date: 2018-01-12 09:22:28
Website:
https://www.hidglobal.com
RFID CHIPS: Active, Semi-passive and Passive RFID Tags
Active, semi-passive and passive RFID tags are making RFID technology more accessible and prominent in our world. These tags are less expensive to produce, and they can be made small enough to fit on almost any product.
Active and semi-passive RFID tags use internal batteries to power their circuits. An active tag also uses its battery to broadcast radio waves to a reader, whereas a semi-passive...
Date: 2017-08-27 13:08:05
Website:
rfid-chips.blogspot.com
RFID tags - TrailerTrailers
RFID tags - Tag types
Active RFID tags
These tags have a small battery built into the tags, batteries can sometimes be replaceable or the unit will be replaced after certain time, normally between 1 year and 7 years.
The advantages and disadvantages of active tags can be summarised as follows;
The active RFID tag cannot function without battery power,...
Date: 2007-01-02 01:30:49
Website:
http://www.trailertrailers.com
Related topics : cost of active and passive rfid tags / rfid active reader passive tag / active rfid tag battery life / difference between active rfid tag and passive rfid tag / difference between active and passive rfid tags
RFID Cattle-RFID Tag, RFID Reader, RFID Software, RFID ...
RFID Cattle
�
Recently, the leading professional manufacturer DAILY RFID has unveiled a kind of RFID Cattle tag which has tremendous improvement of livestock management. DAILY RFID has been working independently to develop RFID products including readers and tags in a bit to woo the customers from all over the world.
�
With entirely functional design, RFID Cattle tag has the compact size...
Date: 2017-10-23 14:11:48
Website:
rfid-in-china.com
The Skinny on RFID - Information Technology Programs
RFID technology is already used in many technologies today. The future of RFID technology seems limitless as new ways to utilize its effectiveness are discovered frequently.
Passive and Active Tags
As stated before, passive RFID tags do not have an internal power supply. There is a minute electrical current induced in the antenna by the radio signal it receives. This small current is enough to...
Website:
https://informationtechnologyprograms.org
UHF RFID Printer for RFID paper tags encoding - Alibaba
UHF RFID Printer for RFID paper tags encoding
�
l����������Based on proprietary intellectual property development, printer adapt to global band set to work.
l����������Metal structure and industrial level print performance, can be competent for all customer requirements.
l����������Metal structure and industrial level print...
Website:
http://vanch.en.alibaba.com
Long Distance RFID Reader on sales - Quality Long Distance ...
Four Port UHF RFID module with 12 dbi antenna and 14 meter read distance Product Advantage Remarkable performance with 8dbi RF antenna, can achieve a reading distance over 10m per single tag. Remarkable ... Read More
2018-04-17 18:27:50
Long Distance Impinj R2000 uhf rfid 4 port reader module with WIFI and ISO 18000-6C Product Advantage 1. Employed IMPINJ R2000 RF Chips, up to -82dbm receiving...
Website:
http://www.uhf-rfidreader.com
rfid host system : WHAT IS RFID : RFID Institute South ...
RFID middleware: A set of software components that acts as a bridge between the RFID hardware components and the host application software.
Host application: Software that receives processed and normalized data - sent from the tag - through the reader and the RFID middleware software.
BASICS OF TAGS
WHAT ARE TAGS?
RFID tags are attached to the items that are to be tracked or identified. The tags provide a means to track and manage supply-chain and identification details such as attributes, source, destination and route - for each of the tagged items.
TYPES OF TAGS
The basic types of RFID tags are...
Website:
http://www.rfidtec.co.za
Related topics : passive rfid tag read range / passive rfid tag frequency range / rfid active reader passive tag / semi passive rfid tag range / difference between active rfid tag and passive rfid tag
UHF Long Range RFID Reader Module - D.O RFID Group
The UHF long range RFID reader module with 4 ports ,user can connect 4 monostatic antennas for long range distance or bulk RFID tags. Multi interface let it enable...
Website:
https://www.dorfidreader.com
Related topics : long range uhf rfid reader module / long range rfid reader module / uhf long distance rfid reader module / rfid uhf long range reader / rfid tag reader long range
How do RFID tags work | Passive Active BAP RFID tags
How do RFID tags work?
In addition to the way they are used, RFID tags can also be classified according to the presence or absence of a radio signal transceiver and an embedded power supply:
Active RFID tags: They embed a radio signal transceiver and a battery to power it. Thanks to the integrated power supply, active RFID tags can activate themselves regardless of the presence of a...
Website:
http://www.veryfields.net
RFID Singapore | TrackNet Id - RFID Solutions Provider ...
Hardware Products
Leading RFID solutions provider in Singapore
Here's the deal..our mission is to offer reliable and cost effective rfid solutions to our clients.
The best part?
Tried and tested technology, across multiple industries
Technology demonstrators and proof of concept projects
Design, implementation and...
Website:
https://www.tracknetid.com
Best Rfid Tags to Buy | Buy New Rfid Tags - DHgate.com
Best Rfid Tags to Buy
918 items found for Best rfid tags
Free Shipping
In Stock
Short Description: 100% brand new and high quality, original from 5YOA Operation frequency: 125Khz Each token pre- progr...
US $ 0.19 - 0.25 / Piece
Short Description: EM4305 T5577 Thick Card Frequency:...
Website:
dhgate.com
Active RFID Tags VS. Passive RFID Tags - CYBRA Corporation
If you are a novice to RFID technology, perhaps you've been a little confused over the differences between active and passive RFID tags. The difference is actually simple, but that difference makes the two kinds of tags very different when applying them to businesses and industries.
RFID is automated identification technology. RFID tags contain electronically stored information, which can be...
Website:
cybra.com
What is RFID? - Taggit SA – Tag, track & trace
A host system is a system that manages the flow of data between the RFID readers and tags. This may have a complex structure, where different readers are located across different locations and data flows to the host computer through LANs or the Internet.
RFID Reader
Hand held reader
Fixed reader
A RFID reader can be fixed or hand held and is a device that activates the tag and retrieves the...
Website:
taggitsa.co.za
Problems With RFID - Technovelgy
Technical problems with RFID
Problems with RFID Standards
RFID has been implemented in different ways by different manufacturers; global standards are still being worked on. It should be noted that some RFID devices are never meant to leave their network (as in the case of RFID tags used for inventory control within a company). This can cause problems for companies.
Consumers may also have...
Website:
http://www.technovelgy.com
Related topics : rfid tag reader system / rfid security tag reader / active rfid tag and reader / small rfid tag reader / rfid tag and reader working
Powercast’s Multi-Sensor RFID Tags Boast 10 Meter Read Range
The industry's first RFID Sensor Tags which can include multiple sensors in a single tag, and provide the industry's longest read range of 10 meters, or 32 feet.
"We call it high-function RFID because these new passive RFID Sensor Tags have more than 10 times the operational power of standard passive RFID tags enabling advanced features and unparalleled computing power," said Dr. Charles Greene,...
Date: 2017-11-05 11:20:29
Website:
http://www.prweb.com
Mounting RFID Tags to Metal - Pepperl+Fuchs Blog
RFID low- and high-frequency tags must often be mounted to a metal carrier or metal part.
When mounting an RFID tag to a metal surface, special consideration must be taken to ensure that too much read range is not lost when mounting to this type of surface. The read range is defined as the maximum distance between the RFID tag and the read head while still allowing communication between the two....
Website:
http://blog.pepperl-fuchs.us
Related topics : metal mount rfid tag / rfid tag read range / metal embedded rfid tags / rfid tag for metal / rfid metal tag
Active RFID Tags VS. Passive RFID Tags | CYBRA Corporation
by admin | Jun 9, 2015 | Blog | 0 comments
If you are a novice to RFID technology, perhaps you've been a little confused over the differences between active and passive RFID tags. The difference is actually simple, but that difference makes the two kinds of tags very different when applying them to businesses and industries.
RFID is automated identification technology. RFID tags contain...
Website:
cybra.com
Related topics : difference between active rfid tag and passive rfid tag / active rfid tags vs. passive rfid tags / difference between passive and active rfid tags technology / rfid active reader passive tag / active and passive rfid tags
Times-7 | A1001 Near Field/Short Range UHF RFID Antenna
A1001 Near Field/Short Range UHF RFID Antenna
A1001 Near Field/Short Range UHF RFID Antenna
The A1001 is the smallest commercially available wideband near field UHF antenna. Read distance is from 0 to...
Website:
http://www.times-7.com
Related topics : rfid uhf long range antenna / uhf near field rfid reader antenna / near field uhf rfid antenna / rfid uhf long range reader / uhf rfid tag range
Can I read long range RFID tags with any NFC enabled ...
Can I read long range RFID tags with any NFC enabled Android phone?
Is it possible to read long range (100m) RFID tags on any NFC enabled Android phone?
Usecase: if I hide 3 long range RFID tags in a field and walk across the field, would my phone be able to pick up the signal of those 3 tags while they come in range?
Written 156w ago
High power RFID uses 868MHz or 900MHz frequency bands, and up...
Website:
https://www.quora.com
Related topics : active rfid tag read range / rfid tag read range / rfid tag reader long range / long range active rfid tags / small rfid tags long range
SAG RFID - RFID Transponder | RFID TAG | PROXIMITY CARD ...
Active RFID Tag uses an internal power source, such as a battery, within the tag to continuously power the tag and its RF communication circuitry. Active RFID tag allows extremely low-level RF signals to be received by the tag (since the reader/interrogator does not power the tag), and the tag can generate high-level signals back to the reader/interrogator. Active RFID transponders are...
Website:
http://www.sag.com.tw
Related topics : passive rfid tag and reader / semi passive rfid tag range / difference between active rfid tag and passive rfid tag / passive rfid transponder tags / difference between passive and active rfid tags technology
Active RFID and Passive RFID Systems Described
Active vs Passive RFID
�
There are three basic types of RFID Systems at the time of this writing. The categorization and naming of these systems is based upon the design and operation�of the tags�(Active tags=Active System, etc). All systems rely upon a radio receiver and a radio transmitter. ��
The first system type is� Active RFID �where the� RFID Reader �(radio receiver) is...
Website:
iautomate.com
Metal-Mount UHF Tags onsale - RFID Tag Manufacturers | Oprfid
Long Distance UHF Metal Tag
Metal causes interference with RFID tags, causing loss of performance and a lower read range. That is why OPRFID Technology provides a range of special Metal-Mount UHF Tags , to ensure you a better use in optimum conditions in and on metal.
Whether you are looking for small size or long reading distances, you will find in this range metal tags from 5×5 mm that can be inserted in the metal, up to 170 mm for a long-range reading.
Enjoy Expanded memory capacity chips with Fujitsu MB97R803A, EM MICROELECTRONIC 4325, ...
The range of Metal-Mount UHF Tags offer...
Date: 2017-11-14 03:08:55
Website:
http://www.oprfid.com
The Shocking Price of RFID Tags - Advanced Mobile Group
Tweet
With� RFID technology �becoming more affordable by the day, many business owners are considering RFID tags and readers as a way to reduce the time and cost of tracking assets. But how much do these systems really cost? And is RFID technology the right choice for your business? In this article, we'll explore the different types of RFID systems and how much you can expect to pay for...
Website:
http://www.advancedmobilegroup.com
Types of RFID Tags - AB&R® (American Barcode and RFID)
Support
Passive RFID Tags
Passive tags are comprised of three elements: an integrated circuit or chip, an antenna, and a substrate.
The RFID chip stores data and performs specific tasks. Depending on its design, the chip may be read-only (RO), write-once, read-many (WORM), or read-write (RW). Typically, RFID chips carry 96 bits of memory but can range from 2-1000 bits.
Attached to the chip is the...
Website:
http://www.abr.com
Related topics : difference between active rfid tag and passive rfid tag / difference between passive and active rfid tags technology / rfid active reader passive tag / active and passive rfid tags / difference between active and passive rfid tags
RFID Technology | Coastal R&E
RFID Technology for Product Identity and Tracking in the Nursery Industry
According to� Wikipedia , radio-frequency identification (RFID) is the use of an object (typically referred to as an RFID tag) applied to or incorporated into a product, animal, or person for the purpose of identification and tracking using radio waves. Some tags can be read from several meters away and beyond the line of...
Website:
https://coastal.msstate.edu
New Ultra Small RFID Tags Deliver Long Read Range - YouTube
Tired of having to sacrifice tag size for read range? What happens when you design UHF RFID tags ( http://www.impinj.com/Monza_5_RFID_Ta... ) capable of adapting to the item which they are attached? You get ultra-small form factors capable of achieving the performance levels of tags twice, even three times its size! In fact the new MuTRAK tag is only 49mm2 and can achieve read distances of up to 14 meters --And that's why we'd like to introduce you to the latest RFID tags and inlays from our our partner TAGSYS...
Website:
youtube.com
Related topics : rfid tag read range / small rfid tags long range / uhf rfid tag range / rfid tag long range / how to read rfid tag
RFID Sensor Systems
Tracking & Inventory Systems including Ultra Long RangeTM Passive Tags
Shipping, storage, tracking operations using EPC Gen2 class1 passive RFID systems can be greatly enhanced with the addition of our ultra long range tags. The Ranger TM tags are supplied in several forms that include open air and metal mount enclosures. Our ultra long range tags are meant to...
Date: 2011-06-15 04:00:31
Website:
http://www.rfidsensorsystems.com
Press Release - RFID Sensor Tags for Environmental ...
Powercast's Multi-Sensor RFID Tags Boast 10 Meter Read Range
Battery-free and rechargeable battery versions can include multiple sensors in a single tag, and leverage existing UHF RFID infrastructure
Phoenix, AZ - RFID Journal Live! - May 9, 2017 -- Powercast Corporation, the leader in wireless power-over-distance technology for 14 years, today announced the industry's first RFID Sensor...
Website:
http://www.powercastco.com
Radio Frequency Indentification (RFID) Tags
Radio Frequency Indentification (RFID) Tags
RFID tags come in many sizes and form factors.� They offer a wide range of performance, read distances and are selected...
Website:
wisetrack.com
Related topics : rfid tag frequency / rfid tags for asset tracking / rfid tag read range / rfid tag tracking distance / how to read rfid tag
RFID dictionary definition | RFID defined
radio frequency identification
rfid - Computer Definition
(Radio Frequency IDentification) A data collection technology that uses electronic tags for storing data. The tag, also known as an "electronic label," "transponder" or "code plate," is made up of an RFID chip attached to an antenna. Transmitting in the kilohertz, megahertz and gigahertz ranges, tags may be battery-powered or derive...
Date: 2017-12-09 03:55:18
Website:
http://www.yourdictionary.com
32390: Parallax : Serial RFID Reader and 4 Tag Sampler Kit ...
Serial RFID Reader and 4 Tag Sampler Kit
This handy RFID kit (serial version) matches our popular RFID Reader with various assorted tags. Designed in cooperation with Grand Idea Studio , the Parallax Radio Frequency Identification (RFID) Reader Module is the first low-cost solution to read passive RFID transponder tags. The RFID Reader Module can be used in a wide...
Website:
https://www.jameco.com
RFID Definition from PC Magazine Encyclopedia
Definition of: RFID
RFID
(Radio Frequency IDentification) A data collection technology that uses electronic tags for storing data. The tag, also known as an "electronic label," "transponder" or "code plate," is made up of an RFID chip attached to an antenna. Transmitting in the kilohertz, megahertz and gigahertz ranges, tags may be battery-powered or derive their power from the RF waves coming...
Website:
pcmag.com
Related topics : rfid active reader passive tag / rfid passive tag reader cost / active rfid tags and readers price / cost of active and passive rfid tags / passive rfid tag reader price
Long Distance UHF RFID Reader Module , Contactless Chip ...
Long Distance UHF RFID Reader Module , Contactless Chip RFID Tag Reader Writer
Long Distance UHF RFID Reader Module , Contactless Chip RFID Tag Reader Writer
Product Details:
MOQ for readers: 1pcs; MOQ for tags: 5,000pcs; Sample order excluded.
Price:
3 working days, please confirm with us in advance for large quantities.
Payment Terms:
EPCglobal UHF Class 1 Gen 2 / ISO 18000-6C
Working...
Website:
http://www.rfidreaderuhf.com
RFID Definition from PC Magazine Encyclopedia
Definition of: RFID
RFID
(Radio Frequency IDentification) A data collection technology that uses electronic tags for storing data. The tag, also known as an "electronic label," "transponder" or "code plate," is made up of an RFID chip attached to an antenna. Transmitting in the kilohertz, megahertz and gigahertz ranges, tags may be battery-powered or derive their power from the RF waves coming...
Website:
pcmag.com
32395: Parallax : USB RFID Reader and 4 Tag Sampler Kit ...
Related products
USB RFID Reader and 4 Tag Sampler Kit
This handy RFID kit (USB version) matches our popular RFID Reader with various assorted tags. Designed in cooperation with Grand Idea Studio , the Parallax Radio Frequency Identification (RFID) Reader Module is the first low-cost solution to read passive RFID transponder tags. The RFID Reader Module can be used...
Website:
https://www.jameco.com
RFID and distance measurement - edaboard.com
RFID and distance measurement
Hello Guys,
I have a new project that I want use RFID to verify ID of item and I need measurement distance from reader to TAG. The maximum distance between the reader to TAG is about 7 cm and I want know distance between reader to TAG with accuracy about 1 cm.
Is it possible?
17
Re: RFID and distance measurement
Maybe an ultrasonic sensor will work, if someone is...
Website:
edaboard.com
RFID and distance measurement - Forum for Electronics
RFID and distance measurement
Hello Guys,
I have a new project that I want use RFID to verify ID of item and I need measurement distance from reader to TAG. The maximum distance between the reader to TAG is about 7 cm and I want know distance between reader to TAG with accuracy about 1 cm.
Is it possible?
17
Re: RFID and distance measurement
Maybe an ultrasonic sensor will work, if someone is...
Date: 2016-02-26 15:44:20
Website:
edaboard.com
Related topics : dependence of rfid reader antenna design on read out distance / rfid tag distance measurement / rfid reader distance measurement / uhf rfid tags distance / new design antenna for rfid uhf tags