Results 251 to 260 of about 71,451 (303)

Novel broadband antenna arrays

2012 Loughborough Antennas & Propagation Conference (LAPC), 2012
This paper considers the design of high performance dual polarized compact aperture array antennas. A recently developed Octagonal Ring Antenna array, forming a planar structure, demonstrates desirable characteristics in large scale applications and represents a novel technology for array antenna designs. The main electromagnetic performance parameters
A. K. Brown, Y. Zhang
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Miniature broadband wire antenna

2008 Asia-Pacific Microwave Conference, 2008
A novel antenna composed of three monopoles is investigated first in this paper. In the frequency range 775 - 1910 MHz, the return loss is lower than -10 dB. Meanwhile the radiation patterns are omnidirectional. On this basis, bending top, fractal, coplanar, and loaded structures are applied to realize the miniaturization.
null Jing-Hui Qiu, null Ling-Ling Zhong, null Ning Zhang, null Bo Sun   +3 more
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Broadband quasi-microstrip antenna

IEEE Transactions on Antennas and Propagation, 1995
A new printed microwave antenna is presented. The antenna is a hybrid between a wire antenna array and a microstrip patch antenna. Although the size, cost, and efficiency are comparable to the microstrip patch, the voltage standing wave ratio 2:1 bandwidth of the antenna presented here is above 20%.
B.D. Popovic, J. Schoenberg, Z.B. Popovic   +2 more
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Broadband VHF antenna

1982 Antennas and Propagation Society International Symposium, 2005
Investigations are reported of an electrically short, asymmetrically fed broadband antenna employing a base isolation choke, The base isolation choke minimizes excitation of the mounting platform and improves radiation patterns. The asymmetrical feed optimizes the antenna current distribution over the 30 to 90 MHz frequency range resulting in improved ...
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Broadband Active Microstrip Antennas

21st European Microwave Conference, 1991, 1991
The concept of combining active devices with radiating elements for broadband active antenna design was proposed. An active microstrip transmit antenna was realized by using two sided structure and single-ended one-stage amplifier configuration. A 24 percent bandwidth, which is about 6 time that of the passive patch, was achieved both in terms of ...
H. An, B. Nauwelaers, A. Van de Capelle
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Broadband microstrip array antenna

1980 Antennas and Propagation Society International Symposium, 1980
A broadband (13%) microstrip array antenna with high efficiency, low cost and low weight has been designed and evaluated. The antenna is foam supported and is about 0.15 \lambda thick. The feeding is accomplished by a separate microstrip network. This antenna is compared with two dielectric loaded microstrip antennas, one with a separate stripline feed
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Broadband printed monopole antennas

2004 10th International Symposium on Antenna Technology and Applied Electromagnetics and URSI Conference, 2004
Microstrip patch antenna is generally the most popular antenna for portable devices. These antennas however are inherently narrow band. To obtain a wide bandwidth form a microstrip patch antenna the substrate thickness has to be increased and the dielectric constant of the substrate has to be kept as low as possible [1].
Tharaka Dissanayake, Karu Esselle, Yuehe Ge   +2 more
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Broadband Dipole Antennas

2014
In this chapter we will study some simple dipole type configurations that can provide a broader bandwidth: the cylindrical dipole and biconical antenna. In addition, the chapter introduces the folded dipole antenna, which can provide better matching characteristics than that of the single dipole.
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Broadband stacked printed antennas

2004 10th International Symposium on Antenna Technology and Applied Electromagnetics and URSI Conference, 2004
Microstrip patch antennas have the attractive features of low profile and light weight, and can be made conformal to mounting structures. The conventional patch antennas suffer from the narrow bandwidth. To overcome this problem, a two layer electromagnetically coupled rectangular patch antenna is considered in this paper.
S. M. El-Halafawy, Y. M. M. Antar
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Novel broadband omnidirectional antennas

2012 Asia Pacific Microwave Conference Proceedings, 2012
Three types of novel broadband omnidirectional antennas are developed, including a circularly polarized antenna, a horizontally polarized antenna and a 45° linearly polarized antenna. All of these antennas have a bandwidth of about 30% with good omnidirectional radiation patterns.
Xulin Quan, Ronglin Li
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