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It is my great pleasure to welcome all of you to the 6th edition of the International Workshop on Antenna Technology during 1–3 March, 2010 (iWAT2010) at Lisbon, Portugal. iWAT2010 is hosted by Instituto de Telecomunicações (IT), and Instituto Superior Técnico (IST), Technical University of Lisbon.
High dielectric EBG substrates can be used in patch antenna configurations to reduce size and mitigate substrate modes keeping reasonable radiation efficiency values, ??>0.55. At the same time, in array configurations they avoid grating lobes and scan blindness phenomenon at the same time, as distance and coupling between elements can be reduced. In this paper a 2??2 array configuration using these...
Because the EBGs and Metamaterial structures that exhibit interesting characteristics are almost always strictly periodic in nature and because there is an increasing interest in synthesizing new versions of these structures, we need access to both techniques-and computer codes developed on the basis of these techniques-to accomplish our own design goals. Some of the design objectives of Metamaterials...
This paper proposes a novel dual frequency selective reflectarray that can control reflected beams independently at dual frequencies using two different polarizations. The reflectarray improves propagation by controlling the scattered beams to achieve high speed in broadband wireless mobile communication systems at a high frequency. The reflectarray comprises cross-dipole arrays and double square...
In this paper, a new method for analysis of space coverage in UHF RFID systems is presented. The method is based on EM modeling of tags and reader antennas in desired RFID environment and post-processing of near field data taking into account arbitrary positions and orientations of tags. The method is illustrated for a case when collection of objects pass through the concrete gateway using one to...
Printed wideband and ultra-wideband (UWB) antennas are the simple and low cost electromagnetic radiator design for the front-end system with the low-power and high-data-ratio transmissions. Antenna with stable and directional radiation pattern is critical to maintain the link gain of the wireless communication. With co-existence of UWB and other different wireless systems, UWB antenna with notched...
This work deals with the design of a wideband microstrip log periodic array operating between 4 and 18 GHz (thus working in C, X and Ku bands). A few studies, since now, have been proposed but they are significantly less performing and usually quite complicated. Our solution is remarkably simple and shows both SWR and gain better than likely structures proposed in the literature. The same antenna...
This paper reports a compact internal monopole antenna on the novel organic magnetic material (OMM) for DVB-H applications (470-750 MHz) in a typical mobile handset with PWB dimension of 104 mm ?? 60 mm. With the usage of organic magnetic material, the total size of antenna is as small as 60 mm (L) ?? 5.5 mm (W) ?? 6 mm (H), resulting in 17% size reduction. Compared with antenna on conventional PC/ABS...
Two concepts of building highly integrated beam steerable antennas for space applications are described: As a first example an integrated phased array antenna using liquid crystal phase shifters in a LTCC technology shows promising results for application in space communication. As a second example a fully integrated digital beam steering antenna in LTCC technology demonstrates how a high integration...
Dual-band operation is highly desirable for wearable devices that need to connect with a range of wireless systems. We present a series of microstrip-line fed, dual-band compact patch antennas designed to operate in the common 2.45 GHz and 5.8 GHz bands for body-centric communications. All of the designs are low-profile and, with further study, may be suitably implemented in flexible or fabric materials...
The effects of ground plane size on the characteristics of a square microstrip patch antenna designed on a low-permittivity substrate with an air gap were investigated. The characteristics studied include return loss, gain, half-power beamwidth (HPBW), and radiation pattern. The gain and HPBW varied periodically with increasing ground plane size, and were out of phase with each other. The relationship...
A compact and optimized design of a rectangular printed monopole antenna with slits and truncated ground plane on FR-4 substrate is presented. The proposed antenna is designed for dual-band operation at 2.4 GHz and 5.2 GHz for Wireless Local Area Network (WLAN) applications with S11 < -10 dB. This antenna has good return loss and radiation characteristics in required frequency band. The proposed...
A novel design of compact dielectric resonator antenna (DRA) dedicated to ultra wideband applications such as Digital Video Broadcasting-Handheld (DVB-H) is presented in this paper. A miniaturization technique has been performed in order to reduce the antenna size. The obtained dimensions of the final design of the DRA are ??0/7 ?? ??0/13 ?? ??0/28 at 466 MHz. Also, measurements are presented to validate...
This paper presents the design of a single feed multiband printed monopole antenna array using the 2nd generation of the Minkowski fractal geometry. The multiband operation is achieved by a suitable chosen of the size and iteration of the fractal geometry, which is optimized using the EM simulation tool Ansoft HFSS. During this work, it is found that adding a rectangular stub on the ground plane,...
Over the past 10 years or so, many broadband and ultra-wideband antennas have been developed for broadband high data rate mobile communications. It is realized how to make efficient and accurate measurements for such antennas could be a challenging issue. In this paper, we examine the antenna efficiency measurement techniques which have been used up to now, and identify their advantages and disadvantages...
The application of multiple-input multiple-output (MIMO) in body-area networks (BAN) is considered in the paper. The correlations between MIMO sub-channels and the MIMO channel capacity are investigated for three on-body channels when random movements are performed in an indoor environment. Some of the MIMO sub-channels were found to be correlated. Nevertheless, a significant capacity increase due...
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