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Recently, automated identification techniques that utilize radio frequency (RF) systems have experienced growth both in the industry and in research worldwide. The current state-of-art of this identification realm is the radio frequency identification (RFID) system, which utilizes a transponder with a unique identifier. RFID systems can be classified into active systems (with built-in power supply),...
Based on the structure of CRLH-TL, a novel phase shifter with high power capacity is proposed. In this structure, switches are mounted on the fingers of CRLH-TL, thus the current through a single switch is only a fraction of that through the whole phase shifter, which greatly improves the power capacity. Moreover, the present phase shifter possesses other advantages such as low cost, small size and...
The advancement in new numerical technique is the key to success of newer generation RF MEMS devices. In this paper, a novel time-domain modeling technique that has the capability to accurately simulate the transient effect of RF MEMS variable capacitors with accelerated motion controlled by the coupling of the electrostatic and mechanical forces is presented. The relation between the sinusoidal modulations...
In this paper, we present an analytical view of the maximum far-field tag gain of a typical commercially available passive UHF RFID tag design operating at 915 MHz, which is the center frequency of the Industrial, Science, and Medical (ISM) band. The far field gain is calculated using FEKO 5.3 designed by EMSS, which is a computational electromagnetic (CEM) tool, and the method used here includes...
We have presented the design and full-wave analyses of a frequency reconfigurable antenna in response to public safety communities' mobile wireless communications applications. The antenna, MRA patch, can be tuned to operate at 0.8 GHz, 2.4 GHz and 4.9 GHz frequrencies. The MRA patch exhibits very similar gain and well behaved radiation patterns at each frequency band. The design and microfabrication...
It is shown in this paper that properly designed R-Card fences can be installed in indoor measurement facility to reduce the multipath signals in the chamber. The design is especially more effective when the transmit antenna is closer to the absorber wall. The traditional foam absorber works well when the angle of incidence is less than 50 degrees if the thickness is about 2 wavelengths. The R- Card...
This paper describes the development of a dual frequency, circular polarized feed which operates over the S/X frequency bands. The feed is incorporated into a 12 meter Cassagrain reflector system for use in radio astronomy applications. The selected design consists of two separate feeds assembled in a coaxial configuration. The inner circular waveguide is used for X-band and the outer coaxial circular...
This paper proposes a PCE that uses available space in the phone housing effectively and adds additional bands to existing PIFA. The PCE can be used advantageously to add a GPS band to a cellular band PIFA but other uses. The PE can be manufactured cost effectively and can be added to an existing phone without re-tooling the plastic housing.
In this paper, the passive UHF RFID tag is characterized on a metal slab for varying distances. The bent dipole tag designed by UPM Raflatac Corporation and the Squiggle tag designed by Alien Corporation is tested for electromagnetic strength of the reply signal. These tags are also simulated in FEKO 5.3 designed by EMSS to depict their performances on the metal slab for varying distances, and is...
We presented a channel capacity evaluation of body-worn radio systems using a decomposition of the channel environment. Specifically, the human body interactions were treated separately from the propagation channel. Via this decomposition, we proceeded to evaluate body-worn antenna diversity. Full wave simulations of the environment were compared with the decomposition approach for validation. A systematic...
For the first time the use of RCS of multi-band scatterers is proposed for the remote identification of micro-sensors in a wireless sensors network. The next step will consist of connecting a specific multi-band scatterer to each micro-sensor and, to achieve simultaneously the remote measurement of a physical quantity (via the electromagnetic transduction principle) and the sensor identification (via...
The analysis of path loss in scattering zone by using UTD is presented. The results of the total field results from the UTD solution agree very well with that from NEC-BSC. Around the vicinity of the source, the UTD results agree with experimental results but not in the further region. This is due to the fact that the line-of-sight and reflected field components are very strong in this region. For...
This paper presents a design concept to aid in the detection and tracking of objects in a cluttered environment. The goal is to uniquely identify large, relatively cylindrical metallic objects in a warehouse setting. In addition to the challenge of determining the object's precise location, it is also desirable to uniquely identify each cylinder. The application is similar to RFID but differs in that...
We developed a simple experimental testbed to collect statistical properties of the proposed RF-DNA system. It consisted of a manufactured prototype of the 5 x 10 patch antenna matrix proposed and eight benchmark RF-DNA instances manufactured using gauge-22 copper wire and DragonSkin as a plastic substrate that fixed the randomized topology of the wire once for all. The instances are illustrated....
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