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Antennas and Propagation Society International Symposium, 1996. AP-S. Digest

Date 21-26 July 1996

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  • Planar front-ends with polarization agile IF systems

    Publication Year: 1996, Page(s):1532 - 1535 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (203 KB)

    A low-cost front-end with polarization agility has been developed. The idea is based on IF processing and eliminates the use of front-end attenuators and phase-shifters. An X-band prototype with a dual-polarized microstrip antenna has been designed and tested. The measured isolation between the horizontal and vertical channels is better than 30 dB. Tests show that the polarization agility is achie... View full abstract»

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  • A dual polarised microstrip antenna with low cross-polarisation, for SAR applications

    Publication Year: 1996, Page(s):1536 - 1539 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (227 KB)

    The design, development and the measurement of a dual polarised, electromagnetically coupled square patch is described. The antenna array is required to scan not only in the elevation plane, providing multiple and variable swath operation, but also in the azimuth plane so that the SAR antenna can be used in the spotlight mode. View full abstract»

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  • Planar single- and dual-polarized aperture coupled E-band antennas on GaAs using SiN/sub x/-membranes

    Publication Year: 1996, Page(s):1540 - 1543 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (261 KB)

    Planar aperture coupled microstrip antennas have been successfully designed, fabricated, and tested for operation at E-band frequencies. Single antenna patches have been realized as well as 3/spl times/1 arrays with single and dual polarization capability. The antennas are suspended on thin SiN/sub x/ membranes fabricated on GaAs substrate by using a novel process step. To design the antenna patch... View full abstract»

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  • A two substrate dual polarised aperture coupled patch

    Publication Year: 1996, Page(s):1544 - 1547 vol.3
    Cited by:  Papers (23)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (237 KB)

    We present a broadband dual polarised aperture coupled patch with high polarisation isolation. Both dual linear and dual circular configurations were investigated. Although dimensions are give for a specific substrate and frequency using the impedances and frequency scaling this design can be applied to other frequency bands. These particular designs were optimised for wide bandwidth but the conce... View full abstract»

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  • Dual polarized slot array antennas fed by triplate transmission lines

    Publication Year: 1996, Page(s):1548 - 1551 vol.3
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (218 KB)

    A small array composed of four slot elements has been investigated [Nakayama and Nakano, 1995]. This array, for which the feed system is designed using a decoupling technique, operates as a dual linear polarization antenna. The decoupling technique is found to be useful for obtaining high input port isolation. This paper presents large array antennas composed of 16 and 64 slots. Stacked and coplan... View full abstract»

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  • Characteristics of dual polarized flat antenna

    Publication Year: 1996, Page(s):1552 - 1555 vol.3
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (167 KB)

    The tri-plate flat antenna has a very attractive performance such as wide frequency band-width, high efficiency and easy manufacturing. The dual polarized flat array antenna had been practically developed by experimental optimization. Since this kind of multi-layer antenna is excited by an electromagnetic coupled feeding probe, it is difficult to obtain an analysis model including the effect of pr... View full abstract»

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  • Theoretical and experimental studies on the microstrip-fed inverted patch antenna with linear or circular polarization

    Publication Year: 1996, Page(s):1556 - 1559 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    A microstrip-fed inverted patch antenna with linear or circular polarization, holding an air layer between the patch and the ground, is proposed to realize the broad-band patch antenna printed over a very thin substrate at the low-cost level. For a linearly polarized type, its input characteristics are rigorously characterized by a novel spectral-domain moment method. Compared with the conventiona... View full abstract»

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  • A dual polarization patch rectenna for high power application

    Publication Year: 1996, Page(s):1560 - 1563 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (253 KB)

    A stratosphere radio relay system is being considered for a future communication system. To develop a radio relay platform, microwave power transmission is a good candidate for the energy supply. The Communications Research Laboratory is engaged in developing a rectenna to extract electric power from a transmitted microwave in order to keep flying the stationary platform. A microwave power transmi... View full abstract»

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  • A meander-line bow-tie antenna

    Publication Year: 1996, Page(s):1566 - 1569 vol.3
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (227 KB)

    A new class of antenna, the meander-line bow-tie (MLBT) antenna is proposed. Similar to other bent antennas, e.g. zigzag, meander etc., this antenna resonates at a shorter length than a straight-wire monopole or dipole. Also this antenna has superior performance characteristics compared to other bent wire antennas. The results presented in this paper show that the meander-line bow-tie antenna has ... View full abstract»

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  • The volume-loaded short dipole

    Publication Year: 1996, Page(s):1570 - 1573 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (198 KB)

    This paper describes a new class of shapes for electrically-small dipole antennas. It presents some experimental results which verify the main numerically predicted properties, and numerically explores the dependence of performance parameters on shape. View full abstract»

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  • Analysis of whip antenna fed by a slot antenna with electromagnetic coupling

    Publication Year: 1996, Page(s):1574 - 1577 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (212 KB)

    In this paper, a new type of antenna without the contact feed point is proposed for mobile information terminals. The whip antenna is excited by the built-in antenna with electromagnetic coupling. The built-in antenna acts as a radiator when the whip antenna is pulled in. The built-in antenna acts as not only a radiator but also an exciter for the whip antenna when the whip antenna is extended. In... View full abstract»

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  • Broadband characteristics of capacitively loaded monopole antennas

    Publication Year: 1996, Page(s):1578 - 1581 vol.3
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (181 KB)

    The narrowband frequency characteristics of straight-wire antennas can be overcome by proper loading of the antenna. The bandwidth characteristics of the loaded antennas are investigated through an optimization routine. A bandwidth ratio of 7.58:1 is achieved with a 0.75 meter long capacitively loaded antenna and a simple matching network. The current distribution of the antenna is determined nume... View full abstract»

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  • Folded loop antenna for mobile communication systems

    Publication Year: 1996, Page(s):1582 - 1585 vol.3
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (179 KB)

    There has been tremendous world-wide activity aimed at developing mobile communication systems. The growing market demand generates interest in the performance of compact antenna structures mounted on portable devices. Some of the desired features for these antennas include low profile geometry, ease of construction, low cost, attractive appearance, and omnidirectional radiation pattern on the azi... View full abstract»

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  • Optimization of aperture coupled patch antenna element for mobile communication applications

    Publication Year: 1996, Page(s):1586 - 1589 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (199 KB)

    We discuss the optimization and design of a single-layer, single-patch antenna element for base station array antennas. Such an element should have a minimum of 10% bandwidth and preferably a return loss of 20 dB or more. The antennas used in base stations for mobile communications usually consists of linear arrays of radiating elements in order to achieve the desired pattern: narrow beamwidth in ... View full abstract»

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  • Radiation characteristics of circularly polarized patch antennas mounted in a 2.45 GHz wireless ID card system

    Publication Year: 1996, Page(s):1590 - 1593 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (290 KB)

    A 2/spl times/2 circularly polarized patch antenna array is developed for the realization of noncontact data transfer between the ID card and the transmitter for a 2.45 GHz wireless ID card system. A digital phase shifter using PIN-diodes is inserted between two paired antenna elements to adjust its radiation beam compatible with application environments. Radiation characteristics with the axial r... View full abstract»

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  • Microstrip ring antennas for PCS application

    Publication Year: 1996, Page(s):1594 - 1597 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (169 KB)

    Since the mid-1970s, microstrip antennas have received a lot of attention, and significant achievement has been made to improve what is called the 'inherent' narrow bandwidth and low gain. However, research in this field is still quite active. In contrast with traditional antenna technology, microstrip antennas provide the potential to form arrays, active antennas, and polarization diversity. New ... View full abstract»

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  • Numerical analysis of the radiation characteristics of the meander line antennas consisting of two strips

    Publication Year: 1996, Page(s):1598 - 1601 vol.3
    Cited by:  Papers (5)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (196 KB)

    With the development of mobile terminal equipment, the demand for smaller handsets has increased. The size of many devices are decreasing, however, it is difficult to reduce the size of an antenna, that is, there are problems of impedance matching, bandwidth and radiation efficiency with down sizing. Currently, in a personal radio system, a whip antenna, a planar inverted F antenna (PIFA) and a he... View full abstract»

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  • Design of a base station antenna with a sharp roll-off sector pattern

    Publication Year: 1996, Page(s):1602 - 1605 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (176 KB)

    In the design of base station antennas for cellular architectures such as PCS, it is desired that the elevation and/or azimuth patterns be shaped to have a sharp sector pattern in order to maximize the gain and reduce interference. While the antenna analysis problem is one of determining the radiation pattern and impedance of a given antenna, the antenna synthesis or design is the determination of... View full abstract»

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  • An active phased array antenna packaging scheme

    Publication Year: 1996, Page(s):1608 - 1611 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (210 KB)

    Active phased array antennas use a large number of transmit/receive (T/R) modules at the antenna aperture. These antennas require complex RF power divider/combiner beamforming networks. DC power is generally provided by distributing power supplies at the antenna aperture that provide DC power to a group of T/R modules. High power T/R modules for phased arrays typically require liquid cooling. A ty... View full abstract»

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  • Multibeam array using Rotman lens and RF heterodyne

    Publication Year: 1996, Page(s):1612 - 1615 vol.3
    Cited by:  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (218 KB)

    An RF heterodyne technique applied to a Rotman lens to reduce the size of the beamforming network for an airborne antenna operating at L-band is presented. An example is given for a multibeam transmit array with 48 columns of radiating elements and 60 beam positions. To fit the antenna in the limited space on the aircraft, the feed network can be reduced ten times in size by mixing two input signa... View full abstract»

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  • Multiband phased-array antenna with interleaved tapered-elements and waveguide radiators

    Publication Year: 1996, Page(s):1616 - 1619 vol.3
    Cited by:  Papers (6)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (191 KB)

    Multiband, multibeam, phased array antennas are required for today's multi-function radar and communication applications. These types of antennas play a major role in the shipboard and airborne environment, where space is limited. A single antenna is now asked to perform multiple functions, including long-range surveillance, navigation, weapons control, tracking and recognition, and electronic war... View full abstract»

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  • Time-delay feed architectures for active scanned arrays

    Publication Year: 1996, Page(s):1620 - 1623 vol.3
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (162 KB)

    Phased arrays are inherently narrow band antennas where the scan-angle changes as a function of frequency. This characteristic is exploited in frequency scanned arrays, but with phased arrays it restricts the use of bandwidth which is needed to enhance radar capabilities and performance. The narrow bandwidth of phased arrays is due to phase being controlled for the antenna aperture excitation rath... View full abstract»

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  • Voltage controlled ferroelectric lens phased arrays

    Publication Year: 1996, Page(s):1624 - 1627 vol.3
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (236 KB)

    Phased array antennas can steer transmitted and received signals without mechanically rotating the antenna. Each radiating element of a phased array is normally connected to a phase shifter, which determines the phase of the signal at each element to form a beam at the desired angle. The most commonly used phase shifters are ferrite and diode phase shifters. Phase shifters using ferroelectric mate... View full abstract»

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  • Fan beam formation using spiral array antennas

    Publication Year: 1996, Page(s):1628 - 1631 vol.3
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (190 KB)

    Two types of spiral array antennas that form circularly polarized fan beams are numerically analyzed. One is composed of two-arm elliptical spiral elements, and the other is composed of single-arm round spiral elements. It is found that the elliptical spiral array antenna can radiate a wider fan beam than a conventional round spiral array antenna. It is also found that the single-arm spiral array ... View full abstract»

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  • Beamformers: broadband RF technology for integrated networks

    Publication Year: 1996, Page(s):1632 - 1635 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (289 KB)

    Beamformers are used in both radiation and reception of electromagnetic energy. Beamforming networks in antenna arrays shape beams and steer their direction electronically; requiring no mechanical motion. Arrays of antennas combined with beamformers create synthetic spatial apertures. In addition, beamformers are used for spatial filtering of interference signals. Applications include radar, satel... View full abstract»

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