A Circularly Polarized Traveling-Wave Chain Antenna

Henriksson, Johan; Markus, K.; Tiuri, M.

doi:10.1109/euma.1979.332695

Cited by 11 publications

(7 citation statements)

References 4 publications

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“…Operating frequency CP wave bandwidth Radiation efficiency Matched termination Rampart line [3] 15 GHz --Required Chain line [9] 3 GHz -50∼60% Required Crank line [10] 12 GHz (3%) -Required Loop line [11] ---Required Loop line (prototype)…”

Section: Forms Of Array Structurementioning

confidence: 99%

A Loop-Line Antenna with Enhanced Bandwidth of Circular Polarization

Hirose

Nakatsu

Nakano

2020

International Journal of Antennas and Propagation

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We investigate a circularly polarized (CP) transmission-line antenna composed of loop radiation elements, called a loop-line antenna. To enhance the CP wave bandwidth, an isolated loop radiation element is first analyzed using the method of moments. It is found that a CP wave bandwidth for a 3 dB axial-ratio criterion has a maximum value of 8%. On the basis of the analysis results, we design the loop-line antenna. It is found that the antenna shows a CP wave bandwidth of 6%, which is twice as wide as that of a conventional loop-line antenna. The analysis results are verified with experimental ones. In addition, a condition for wideband CP radiation is discussed and found to be a composite radiation element consisting of two CP loops.

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Section: Forms Of Array Structurementioning

confidence: 99%

A Loop-Line Antenna with Enhanced Bandwidth of Circular Polarization

Hirose

Nakatsu

Nakano

2020

International Journal of Antennas and Propagation

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“…In [18][19][20][21], the rampart line antenna, a frequency scanning printed antenna, is proposed. This radiator is a travelling wave antenna realized with a meandered microstrip line that guarantees a wide band and reduced complexity.…”

Section: Introductionmentioning

confidence: 99%

“…This solution, even if accurate, is computationally expensive. In the cited references, rampart line antennas are designed using hardware or software experiments [20,22], applying phased array antenna (PAA) theory [18,19,21,22,25], or applying leaky-wave antenna (LWA) theory [26,28,29]. Both theoretical approaches are valid.…”

Section: Introductionmentioning

confidence: 99%

Analysis and modelling of rampart line antennas

Sacco

Caytan

Pisa

et al. 2021

IET Microwaves Antenna & Prop

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A new, efficient, and accurate analytical model is introduced for estimating the beam direction of rampart line antennas with microstrip radiators that can change beam direction with feeding frequency. The model takes its origins from 1-D array theory, in which the bends represent the radiating elements, and the interconnecting lines represent the phase shifters. A mathematical expression accounting for the equivalent length of the bends for the correct estimation of the distance between the radiators is introduced. The model was tested for various substrate relative permittivity values ranging from 2.9 to 6.45. This model can be used for arbitrary rampart line configurations by providing the equivalent dipole direction, depending on the orientation of the bends. An alternative geometry was proposed to reduce the coupling between the parallel line segments. A prototype operating in a bandwidth of 1 GHz around 7.8 GHz was realized on a Rogers RO4350B high-frequency laminate with a thickness of 1.524 mm. Both the radiation pattern and the reflection coefficient were measured and show a good agreement with the proposed analytical model and commercial full-wave simulation tool results.This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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“…When the series of radiation cells is excited from its one end, the radiation cells act like element antennas of a conventional array, and radiate a narrow beam. To make the radiation beam circularly polarized (CP), several types of radiation cells have been investigated; they are a crank- [3], a rampert- [4], a chain- [5], and a loop-type [6]. The CP line antenna has an advantage over the conventional array antenna in that there is no need to design the feed network since the radiation cells are formed by the feed line itself.…”

Section: Introductionmentioning

confidence: 99%

Circularly polarized loop‐line antennas

Hirose

Sakurai

Nakano

2003

Electron. Comm. Jpn. Pt. I

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SUMMARYA novel miscrostrip line antenna consisting of loop radiation cells is analyzed using the method of moments.First, an open-loop line antenna is analyzed as a reference antenna. The analysis shows that, as the number of radiation cells is decreased, the reflected current increases to deteriorate the axial ratio. Next, a closed-loop line antenna is proposed. The antenna is characterized by its radiation mechanism where both the traveling and reflected currents contribute to the radiation of the same rotational sense of circular polarization. The number of the radiation cells is chosen to be four, where the reference antenna cannot radiate a CP wave. It is found that the antenna radiates a CP wave with an axial ratio of less than 3 dB in a frequency bandwidth of 3%, where the gain is approximately 15 dBi. These bandwidth and gain are also found to be comparable to those of a conventional array composed of four loop antennas.

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A Circularly Polarized Traveling-Wave Chain Antenna

Cited by 11 publications

References 4 publications

A Loop-Line Antenna with Enhanced Bandwidth of Circular Polarization

A Loop-Line Antenna with Enhanced Bandwidth of Circular Polarization

Analysis and modelling of rampart line antennas

Circularly polarized loop‐line antennas

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