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International Journal of Microwave Science and Technology 2010

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Overview of Microstrip Antennas. Texas holdem free card games. Also called “patch antennas” One of the most useful antennas at microwave frequencies (f 1 GHz). It usually consists of a metal “patch” on top of a grounded dielectric substrate. The patch may be in a variety of shapes, but rectangular and circular are the most common. Microstrip line feed Coax feed. Effects of Slot Loading on Microstrip Patch Antennas. This study presents the theoretical and experimental investigation on the effect of rectangular slot on resonance frequency, return loss and band widths of a novel, single layer, single probe-fed rectangular microstrip patch antenna.

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DOI: 10.1155/2010/535307

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Abstract:

Three patch antennas suitable for integration and operation in a compact 24？GHz wireless sensor node with radar and communication functions are designed, characterized, and compared. The antennas are manufactured on a low loss glass wafer using thin film (BCB/Cu) wafer level processing (WLP) technologies. This process is well suited for 3D stacking. The antennas are fed through a microstrip line underneath a ground plane coupling into the patch resonator through a slot aperture. Linear polarization (LP), dual mode (DM) operation, and circular polarization (CP) are achieved through the layout of the slot aperture and rectangular patch dimensions. Antenna gain values of ~5.5？dBi are obtained in addition to the 10 dB impedance bandwidths of 900？MHz and 1.3？GHz as well as 500？MHz CP bandwidth with a 3？dB axial ratio for the LP, DM, and CP patch antennas, respectively. 1. Introduction Autarkic wireless sensor networks are becoming widespread in industrial applications and have been in the focus of many research activities [1]. The development and application of tiny radio sensor nodes that are equipped with radar and communication functions are of interest for gathering spatial information in addition to sensor information [2]. The 24？GHz unlicensed ISM (industrial, scientific, and medical) frequency band, with a free space wavelength of 12.5？mm, allows the realization of radar with a spatial resolution in the cm-range. There is also more bandwidth (250？MHz) available for frequency modulated communication and radar signals compared to the popular ISM band at 2.4 GHz. Another advantage of the short wavelength is that efficient antennas can be realized for integration in the sensor node platform increasing the miniaturization potential. The integrated antenna plays a crucial role in the overall system performance of such sensor node applications. To date, much research has focused on planar antenna designs for quasi millimeter-wave applications using PCB or LTCC technologies [3–5]. However, highly integrated sensor node platforms comprise compact 3D stacks, where the antenna is integrated in one of the stack modules [6–8]. For this purpose, antenna designs suitable for 3D stacks and thin film processing have been reported. These include patch antennas processed directly on silicon substrates [9]. Since silicon substrates are lossy, micromachining techniques [10], used to create cavities, and high resistivity silicon (HRS) substrates [11] have been employed to increase the antenna efficiency. These approaches, however, lead to high costs. Therefore, in order to

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Effects Of Slot Loading On Microstrip Patch Antennas Reviews

Effects Of Slot Loading On Microstrip Patch Antennas For Sale

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