Design of 94GHz Dual-Polarization Antenna Fed by Diagonal Horn for Cloud Radars

Wang, Jie; Lin, Hai; Yang, Fan; Xu, Guang-Xin; Ge, Jingpeng

doi:10.1109/access.2022.3154483

Cited by 7 publications

(4 citation statements)

References 25 publications

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“…It works at 94 GHz for dual-polarization measurements. It is a pulse Doppler radar using SSPA and has only a single antenna with two polarized ports [25]. Segment pulse detection and pulse compression technology are used to overcome the lower output power of SSPA.…”

Section: The Tj-ii Radarmentioning

confidence: 99%

A Cloud Detection Method for Vertically Pointing Millimeter-Wavelength Cloud Radar

Lin,

Wang,

2023

Sensors

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A new method using three dimensions of cloud continuity, including range dimension, Doppler dimension, and time dimension, is proposed to discriminate cloud from noise and detect more weak cloud signals in vertically pointing millimeter-wave cloud radar observations by fully utilizing the spatiotemporal continuum of clouds. A modified noise level estimation method based on the Hildebrand and Sekhon algorithm is used for more accurate noise level estimation, which is critical for weak signals. The detection method consists of three steps. The first two steps are performed at the Doppler power spectrum stage, while the third step is performed at the base data stage. In the first step, a new adaptive spatial filter combined with the Kuwaraha filter and the Gaussian filter, using the ratio of mean to standard deviation as the adaptive parameter, is applied to initially mask the potential cloud signals to improve the detection performance at the boundary of cloud and noise. Simulations of boundary cases were performed to compare our adaptive filter and normal Gaussian filters. Box filters are used in steps two and three to remove the remaining noise. We applied our method to cloud radar observations with TJ-II cloud radar at the Nanjing University of Information Science & Technology. The results showed that our method can detect more weak cloud signals than the usual methods, which are performed only at the Doppler power spectrum stage or the base data stage.

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Section: The Tj-ii Radarmentioning

confidence: 99%

A Cloud Detection Method for Vertically Pointing Millimeter-Wavelength Cloud Radar

Lin,

Wang,

2023

Sensors

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“…A dual-polarization Cassegrain antenna is used for linear depolarization ratio (LDR) detection [12], as shown in Figure 5. The antenna consists of a D = 540 mm main reflector, a sub-reflector, and a dual-port dual-polarization diagonal horn feed antenna.…”

Section: Cassegrain Antennamentioning

confidence: 99%

A 94 GHz Pulse Doppler Solid-State Millimeter-Wave Cloud Radar

Lin

Wang

2023

Remote Sensing

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A 94 GHz pulse Doppler solid-state millimeter-wave cloud radar (MMCR), Tianjian-II (TJ-II), has been developed. It reduces the size and cost using a solid-state power amplifier (SSPA) and a single antenna. This paper describes the system design, including hardware and signal processing components. Pulse compression, segmented pulse, and dual pulse repetition frequency (PRF) technologies are employed to overcome the limitations imposed by the low power of the SSPA and the high frequency of 94 GHz. The TJ-II also features a dual-polarization, high-gain antenna for linear depolarization ratio detection and a time-division receive channel to improve channel consistency and save on costs. To achieve high flexibility and low interference in signal transmission and reception, the TJ-II uses software-defined radio technology, including direct digital synthesis, digital downconversion, and bandpass sampling. A series of Doppler power spectrum processing methods are proposed for detecting weak cloud signals and improving scene adaptability.

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“…Waveguide radiators and horn antennas are a common type of microwave antenna [1]. They are used as separate antennas, as well as radiating elements of other antennas (reflex, lens) [2].…”

Section: Introductionmentioning

confidence: 99%

Study of the radiation pattern of a rectangular horn antenna in the operation of multimode propagation of electromagnetic waves

Семенов

Семенова

Pinaiev

et al. 2022

TAPR

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The object of research in the work is the process of radiation of electromagnetic waves and the directional properties of a rectangular horn antenna in a multimode operation. The existing problem is that in practice when developing and researching horn antennas, only the single-mode mode of their operation is taken into account. The fundamental mode of the rectangular waveguide that feeds this horn antenna is chosen as the base mode of the emitted electromagnetic wave. Radiation of higher types of electromagnetic waves is not taken into account. To take into account the impact of higher types of electromagnetic waves on the directional properties of a rectangular horn antenna, it is proposed to investigate a multimode mode consisting of three types of magnetic waves H10, H20, and H30. Horn antennas have high-quality wide-range properties and make it possible to obtain a maximum frequency coverage ratio of 1.5–1.8. In this paper, the directional properties of a rectangular horn antenna are determined by the example of calculating and modeling normalized radiation patterns of a standard horn-type for a wide frequency range with an average frequency of 12 GHz and a frequency overlap factor of 1.67. It has been established that when emitting three higher types of waves, it is possible to simultaneously improve the characteristics and directional properties of a horn antenna by changing the amplitude of each component of the constituent waves of electromagnetic radiation. The work aimed to study the normalized radiation patterns of a rectangular horn antenna to improve its directional properties. It was found that with increasing frequency, starting from the middle frequency of the operating frequency range, the radiation pattern of a rectangular horn antenna expanded. That is, the opening angle increased in the direction of the main radiation, with a decrease in the radiation amplitude, the level of the side and rear lobes increased, which leads to a deterioration in the characteristics of the horn antenna. For the selected geometric dimensions of the horn antenna in the frequency range of 12–12.5 GHz in the multimode mode, it was possible to provide almost the same beam width in the horizontal and vertical planes at the level of 13.2–13.6°.

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Design of 94GHz Dual-Polarization Antenna Fed by Diagonal Horn for Cloud Radars

Cited by 7 publications

References 25 publications

A Cloud Detection Method for Vertically Pointing Millimeter-Wavelength Cloud Radar

A Cloud Detection Method for Vertically Pointing Millimeter-Wavelength Cloud Radar

A 94 GHz Pulse Doppler Solid-State Millimeter-Wave Cloud Radar

Study of the radiation pattern of a rectangular horn antenna in the operation of multimode propagation of electromagnetic waves

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