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Log-periodic antenna

About: Log-periodic antenna is a research topic. Over the lifetime, 412 publications have been published within this topic receiving 3530 citations. The topic is also known as: log-periodic array & log-periodic aerial.


Papers
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Journal ArticleDOI
TL;DR: In this article, a coplanar dipole array is proposed to provide unidirectional radiation patterns of constant beamwidth and nearly constant input impedances over any desired bandwidth.
Abstract: A new class of coplanar dipole arrays is introduced. The antennas described provide unidirectional radiation patterns of constant beamwidth and nearly constant input impedances over any desired bandwidth. The broad-band properties are achieved by making use of the principles of log periodic antenna design. Models are discussed which are capable of providing 8- to 9-db directive gain with an associated input standing wave ratio of 1:2:1 on a 75-ohm feeder, and this performance is independent of frequency. The free-space properties of several of these arrays have been measured and the results are presented. The antenna configuration is simple, permitting practical methods of fabrication, and the design should prove useful in many applications. It makes possible, for example, the construction of "all-wave" rotatable beams of very low cross section for use in the hf to uhf spectrum.

332 citations

Journal ArticleDOI
TL;DR: In this article, a new microstrip Yagi array antenna with end-fire radiation and vertical polarization is proposed, which has a low profile, a wide bandwidth and a high gain.
Abstract: A new microstrip Yagi array antenna with endfire radiation and vertical polarization is proposed. The Yagi antenna has a low profile, a wide bandwidth and a high gain. Each element of the Yagi array is based on a new microstrip antenna that has one edge opened and the other three edges shorted, working as a “magnetic dipole antenna”. As opposed to previous microstrip Yagi array antennas, the proposed Yagi antenna could produce a beam radiating at exactly endfire for infinite ground plane, with vertical polarization in the horizontal plane. A coupling microstrip line is introduced between the driven element and the first director element to strengthen the coupling between them, and therefore the front-to-back ratio and bandwidth of the array can be improved. The endfire gain can be enhanced as the number of the director elements increases, in either case where the array has an infinite or a finite ground plane.

182 citations

Journal ArticleDOI
TL;DR: A low profile egg-crate array with wideband printed flared dipole ("bunny-ear") elements was developed for dual-pol applications as discussed by the authors, and a small test array of 9/spl times/9 elements was built and tested in a 1-5 GHz experiment.
Abstract: A low profile egg-crate array with wide-band printed flared dipole ("bunny-ear") elements was developed for dual-pol applications A small test array of 9/spl times/9 elements was built and tested in a 1-5 GHz experiment Gain and scan element patterns in E-, H-, and diagonal cuts were measured Excellent results including low cross-pol were observed

129 citations

Patent
09 Jun 2008
TL;DR: A log-periodic antenna is a type of antenna having a layer of dielectric media interposed between a microstrip and a slot log periodic portion as mentioned in this paper, where an array of two or more logperiodic antennas that may be placed about vehicles, such as air vehicles, or mounted on stationary structures such as communication towers.
Abstract: A log-periodic antenna having a layer of dielectric media interposed between a microstrip log-periodic portion and a slot log-periodic portion where an array of two or more log-periodic antennas that may be placed about vehicles, such as air vehicles, or mounted on stationary structures, such as communication towers.

126 citations

Journal ArticleDOI
TL;DR: It is demonstrated that the proposed antenna element and arrays can be used for future 5G applications to cover the 22% bandwidth of the unlicensed band with high gain and low loss.
Abstract: A wideband linearly polarized antenna element with complementary sources is proposed and exploited for array antennas. The element covers a bandwidth of 38.7% from 50 to 74 GHz with an average gain of 8.7 dBi. The four-way broad wall coupler is applied for the 2 $\times $ 2 subarray, which suppresses the cross-polarization of a single element. Based on the designed 2 $ \times $ 2 subarray, two larger arrays have been designed and measured. The $4 \times 4$ array exhibits 26.7% bandwidth, fully covering the 57–71 GHz unlicensed band. The $8 \times 8$ array antenna covers a bandwidth of 14.5 GHz (22.9%) from 56.1 to 70.6 GHz with a peak gain of 26.7 dBi, and the radiation efficiency is around 80% within the matching band. It is demonstrated that the proposed antenna element and arrays can be used for future 5G applications to cover the 22% bandwidth of the unlicensed band with high gain and low loss.

113 citations

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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20219
202019
201919
201817
201723
201620