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In this paper, three different types of frequently used antennas in passive RFID tags with different sizes are investigated for voltage scavenging application. Most critical is to create a minimum voltage at the antenna port. Therefore, using simulations with two software packages, CST and HFSS, a detailed explanation is presented of the induced voltage at the antenna port versus antenna length and...
MIMO systems may achieve spatial multi-user access using singular value decomposition (SVD) MIMO techniques [J.Z. Ying and K.B. Letaief, 12005; J. Kim and J.M. Cioffi, 2000]. The MIMO OFDM systems multiplex the users both in the frequency and the spatial domains. Hence, the co-channel interference caused by the sub-carrier reuse may lower the system's performance. For MIMO OFDM systems with co-channel...
A Vivaldi TSA array has been designed and analysed. It can operate over 4-16GHz and be capable of scanning to 50deg. This study shows that the strong mutual coupling between elements plays a constructive role in the array performance of active impedance matching. The introduction of corrugated edge to the TSA element has no effect on the active matching but the scan gains are improved. Further research...
This paper presents a broadband omnidirectional vertically polarized antenna of only a one eighth wavelength associated to the lowest frequency. This antenna is composed of a conical monopole with metallic parasitic elements, a capacitive disk and a dielectric substrate placed above a square ground plane. This structure provides broadband performances and omnidirectional radiation patterns over the...
This paper describes a cost-effective approach for an off-chip antenna design and construction that would show the potential for its integration with a 60 GHz SiGe chipset, in a low-cost plastic chip-scale packaging technology or silicon carrier based wafer-scale packaging technology. Obtaining the maximum bandwidth-gain product within a given design constrain is the basic challenge for the design...
The investigation of user interaction presented in this paper focuses on the comparison between the free space and data mode diversity performance of a tri-band "stick" phone size prototype in the uniform 3D propagation environment. A state-of-the-art phantom hand from IndexSAR is used to hold the diversity prototype in the data mode position.
In this paper, we proposed a Folded type Rectangular Loop Antenna (FRLA) for one-seg. The measurement and simulation results indicated that the characteristics of the radiation patterns are similar to a rectangular loop antenna with full wavelength wire and resonates in the lower UHF band. The measured gain of the FRLA is -2.8dBi and the simulated gain is -2.2dBi. In the future, we will study configurations...
We have in this paper, reported on the investigation and validation of the existence of parasitic phase shifts. The cases of HEMT FHX35LG in [4] and E-pHEMT MGA53543 were used for validation, where in both cases; similar phase shifting behaviour was exhibited. This behaviour was exploited for a pre-liminary design of a small linear antenna array. Future work will involve array structures with more...
In this paper, we proposed a tunable half loop antenna with two inductors and variable capacitance. To achieve the wide bandwidth required for DVB-H service, a variable capacitor is added between the transmission line and ground. In addition, the antenna gain is improved by using helical radiators. Even though the proposed antenna has very compact size of 40 mm x 5 mm x 5 mm, its gain is about 4 dB...
In this paper, review of degenerate bandedge (DBE) antenna, followed by variations in plane or in volume to realize multimode and wideband configurations is presented. Ferrite and multilayer substrates are also examined to realize the Magnetic Photonic Crystal (MPC) modes to further improve bandwidth and multifunctionality. Of particular interest in this regard is the use of thin magnetic layers which...
It is well known that a monopole antenna above a ground plane radiates an omni-directional beam around its axis. The height of this monopole can be reduced by using top-loading techniques. One such technique involves attaching a patch to the top of a monopole for use as a microwave antenna. In this case the structure is recognized as a low-profile, center-fed patch antenna. When the antenna height...
This paper reports the techniques applied in developing high performance UWB antennas with miniaturized size, reduced ground plane reliance, and enhanced diversity. The fundamental idea about the design with reduced ground plane reliance is first reviewed. Next, the miniaturized antenna design with less ground plane effect is introduced. Last, the antenna which features the small size, less ground...
On-body communication channels are used in an increasing number of applications, including headsets and wristwatch controllers for mobile phones, and systems for emergency personnel and for personal medical support. In channels for such systems the movement of the body causes significant fading, in addition to that caused by scattering from the local environment. This can be mitigated using diversity...
This paper proposes the configuration of a polyhedral array antenna arranged on a polyhedron and describes the limitation of coverage gain of polyhedral antennas. Here, a cube, an octahedron, a dodecahedron, an icosahedron, the truncated icosahedron (soccer ball type), the polyhedron with 60 triangles, and the polyhedron with 80 triangles are considered. And, the relation between the minimum coverage...
In this paper, we have shown that it was still possible to get a very good diversity system gain for very closely spaced UMTS PIFAs (0.027 lambda0) positioned on the PCB of a small communicating object by using the neutralization technique. The goal is to see how efficient can be the neutralization technique when the radiators are separated by a very small distance or in other terms, how close can...
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