Metallic Monopole Parasitic Antenna With Circularly Polarized Conical Patterns

Karki, Sumit; Sabbadini, M.; Alkhalifeh, Khaldoun; Craeye, Christophe

doi:10.1109/tap.2019.2916737

Cited by 20 publications

(12 citation statements)

References 26 publications

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“…The observed effective patterns are shown in Fig. 9 (see also Karki et al (2019)). Gamma-shaped parasitic elements surround the centrally fed monopole.…”

Section: The Transpondermentioning

confidence: 93%

“…The orange dot (called "limit") represents the requirement (10 −13 at 60 seconds integration time). LaRa will use one antenna for receiving the signal from the Earth and two antennas (to ensure redundancy of the SSPA just prior to the transmitting antennas in the transponder output chain) for retransmitting the signal back to Earth (see detailed description of LaRa's antennas in Karki et al (2019)). The transmitting (Tx) and receiving (Rx) antennas (see Fig.…”

Section: The Transpondermentioning

confidence: 99%

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The radioscience LaRa instrument onboard ExoMars 2020 to investigate the rotation and interior of mars

Déhant

Maistre

Baland

et al. 2020

Planetary and Space Science

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LaRa (Lander Radioscience) is an experiment on the ExoMars 2020 mission that uses the Doppler shift on the radio link due to the motion of the ExoMars platform tied to the surface of Mars with respect to the Earth ground stations (e.g. the deep space network stations of NASA), in order to precisely measure the relative velocity of the lander on Mars with respect to the Earth. The LaRa measurements shall improve the understanding of the structure and processes in the deep interior of Mars by obtaining the rotation and orientation of Mars with a better precision compared to the previous missions. In this paper, we provide the analysis done until now for the best realization of these objectives. We explain the geophysical observation that will be reached with LaRa (Length-of-day variations, precession, nutation, and possibly polar motion). We develop the experiment set up, which includes the ground stations on Earth (so-called ground segment). We describe the instrument, i.e. the transponder and its three antennas. We further detail the link budget and the expected noise level that will be reached. Finally, we detail the expected results, which encompasses the explanation of how we shall determine Mars' orientation parameters, and the way we shall deduce Mars' interior structure and Mars' atmosphere from them. Lastly, we explain briefly how we will be able to determine the Surface platform position.

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“…The observed effective patterns are shown in Fig. 9 (see also Karki et al (2019)). Gamma-shaped parasitic elements surround the centrally fed monopole.…”

Section: The Transpondermentioning

confidence: 93%

Section: The Transpondermentioning

confidence: 99%

The radioscience LaRa instrument onboard ExoMars 2020 to investigate the rotation and interior of mars

Déhant

Maistre

Baland

et al. 2020

Planetary and Space Science

Self Cite

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“…Mobile satellite communications have often required an antenna radiating a circularly polarized (CP) conical beam [1]. For this requirement, many antennas have been investigated [2][3][4][5]. ese antennas are mainly divided into two classes: planar [2,3] and nonplanar [4,5].…”

Section: Introductionmentioning

confidence: 99%

“…For this requirement, many antennas have been investigated [2][3][4][5]. ese antennas are mainly divided into two classes: planar [2,3] and nonplanar [4,5]. In addition, there have been three kinds of radiators used in the nonplanar antennas; they are an aperture [5], slot [6], and monopole [4].…”

Section: Introductionmentioning

confidence: 99%

“…A crossed-wire antenna shown in Figure 1(a)is in a class with the nonplanar antennas having a monopole radiator [7]. e antenna has an advantage over a conventional one [2][3][4][5][6] in that the maximum radiation can be obtained at a lower elevation-angle direction. So far, there has been no investigation to increase the CP wave bandwidth.…”

Section: Introductionmentioning

confidence: 99%

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Modified Crossed-Wire Antennas Radiating a Circularly Polarized Conical Beam

Hirose

Hata

Nakano

2020

International Journal of Antennas and Propagation

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Two types of modified crossed-wire antennas are investigated to enhance a circularly polarized (CP) wave bandwidth. The wire length of each antenna is increased twice as long as that of the original antenna. First, a bent-type antenna is analyzed using the method of moments. It is found that the CP wave bandwidth for a 3 dB axial ratio criterion is twice as wide as that of the original antenna. Next, a spiral-type antenna is analyzed. It is revealed that the antenna shows a CP wave bandwidth of 28%, which is wider than that of the original antenna by a factor of 3.5. The analysis results are validated by experimental work.

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Meta‐surface loading broadband and high‐aperture efficiency dual circularly polarized patch antenna

Ding

Zhao

et al. 2021

Int J RF Microw Comput Aided Eng

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In this article, a broadband dual circularly polarized (CP) patch antenna, which shows high gain and high‐aperture efficiency is proposed by using meta‐surface (MS) loading technique. For the purpose of gain enhancement and port feature improvement of a traditional stacked patch element, a MS including a lattice of 4 × 4 periodic square loops is introduced and investigated. A dual‐port feeding network based on two double‐stage quadrature couplers is carefully designed to excite such two radiation elements to realize broadband dual‐CP operation. Measured results show that the proposed antenna possesses an overlapped bandwidth of 12.8% (from 2.26 to 2.57 GHz), in which port reflection coefficient, axial ratio, and port isolation is better than −13 dB, 3 dB, and −15 dB, respectively. An average peak gain of 10.4 dBic within a compact size of 1.35 λ0 × 0.63 λ0 × 0.116 λ0 (λ0 is the free‐space wavelength at the center frequency 2.41 GHz) is achieved, resulting in a high‐aperture efficiency of 102.5%.

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Metallic Monopole Parasitic Antenna With Circularly Polarized Conical Patterns

Cited by 20 publications

References 26 publications

The radioscience LaRa instrument onboard ExoMars 2020 to investigate the rotation and interior of mars

The radioscience LaRa instrument onboard ExoMars 2020 to investigate the rotation and interior of mars

Modified Crossed-Wire Antennas Radiating a Circularly Polarized Conical Beam

Meta‐surface loading broadband and high‐aperture efficiency dual circularly polarized patch antenna

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