Effects of the common mode on radiation patterns of the tapered slot antenna

Suto, Kuniaki; Matsui, Akinori

doi:10.1109/isanp.2017.8228749

Cited by 5 publications

(2 citation statements)

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“…Thus, when measuring the radiation of an antenna, it is very important to find solutions to reduce or even to cancel the effect of radiation from common mode currents. Among the most frequently used solutions to solve this inconvenience are: the use of baluns or a coil-shaped feed line [ 32 , 33 ] and the replacement of the coaxial cable with an optical fiber [ 34 ].…”

Section: Introductionmentioning

confidence: 99%

A Compact Monopole Antenna for Underwater Acoustic Monitoring Beacons

Bucuci

Constantin

Paun

et al. 2022

Sensors

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Protected wetlands such as deltas, lakes or rivers provide a sanctuary for many endangered species. In order to protect these areas from illegal human interventions, it is necessary to monitor the unauthorized entrance of motor boats. In order to mitigate such an impact, we have developed a network of floating beacons for underwater acoustic monitoring, using LoRa communication modules operating at 433 MHz. Such beacons should be equipped with compact antennas. In this paper, we use a genetic algorithm approach to design the compact, monopole antennas required for the beacons; size constraints would apply not only to the radiating element but also to the ground plane. Although the antenna input is unbalanced, such a small ground plane may yield common mode currents on the antenna feeder, which distort the radiation pattern of the antenna. In order to investigate the effect of the common mode currents, we developed a distance averaging method, while, for characterizing the antenna, we used a single-antenna method. For the experimental validation of the system in real conditions, a continuous monitoring of the lake was carried out. During the monitoring, multiple events generated by incursions of motor boats were successfully detected and recorded.

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Section: Introductionmentioning

confidence: 99%

A Compact Monopole Antenna for Underwater Acoustic Monitoring Beacons

Bucuci

Constantin

Paun

et al. 2022

Sensors

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“…Most of the work treating the radiation from common mode currents at a symmetrical antenna input has focused on characterizing or properly designing a balun [ 6 , 20 ], rather than reducing that effect by post-processing. However, using a balun in a measuring setup not only increases the cost, but would also impinge on the global frequency response.…”

Section: Introductionmentioning

confidence: 99%

Evaluation and Impact Reduction of Common Mode Currents on Antenna Feeders in Radiation Measurements

Constantin

Tamas

2020

Sensors

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Common mode currents on antenna feeders usually occur when feeding a symmetric radiator through an asymmetric line, or when the ground plane is electrically small. Such currents may have magnitudes comparable to the feed currents and therefore have a major impact on the total radiated field. For antenna radiation measurements, both assessment and reduction of the common mode currents on antenna feeders are crucial. Techniques to discriminate antenna and feeder radiation are mainly needed for design and optimization purposes. Antenna gain measurements in a multipath site can be performed by using the distance averaging method. In this paper, we show that the distance averaging technique can be applied to reduce the effect of common mode currents for measuring the field radiated by symmetrical antennas. Two measuring configurations are proposed depending on the number of symmetry degrees of the antenna under test, and a differential approach for extracting the field created by the common mode currents was also developed. The experimental validation was performed by measuring a simple wire dipole and a log-periodic dipole array (LPDA) with a small square loop as a probe, both on the feeder side and on the feeder free side.

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