Phased Arrays

Maruyama, Takashi; Kihira, Kazunari; Miyashita, Hiroaki

doi:10.1007/978-981-4560-44-3_37

Cited by 3 publications

(2 citation statements)

References 33 publications

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“…PARS is primarily designed for communication, where the narrow beam shape allows for high power transmission. In its simplest form, a uniform linear array of

D

antennas, separated by a distance

d_{tx}

, the transmission direction

Ψ_{tx}

can be controlled by adjusting the phase shift for each antenna (Maruyama et al, 2016). The transmitted signal is delayed by an additional

δ_{t}

for each antenna, such that the phase shift from one antenna to the next is the same for all the antennas.…”

Section: Phased‐array Radio Systemsmentioning

confidence: 99%

Unmanned aircraft flight control aided by phased‐array radio navigation

Gryte

Bryne

Johansen

2020

Journal of Field Robotics

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Navigation systems of safety-critical unmanned aircraft need an alternative position aiding source to global navigation satellite system. One promising alternative, is position measurements from phased-array radio systems. The presented navigation system consist of a multiplicative extended Kalman filter that utilize these measurements, along with an exogenous altitude measurement, to aid an inertial navigation system. The reliability and accuracy of the navigation system is demonstrated through beyond-visual-line-of-sight flights with a fixed-wing unmanned aerial vehicle, without the use of global navigation satellite systems. This uses a conventional guidance controller module, which also monitor the navigation quality.

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“…PARS is primarily designed for communication, where the narrow beam shape allows for high power transmission. In its simplest form, a uniform linear array of

D

antennas, separated by a distance

d_{tx}

, the transmission direction

Ψ_{tx}

can be controlled by adjusting the phase shift for each antenna (Maruyama et al, 2016). The transmitted signal is delayed by an additional

δ_{t}

for each antenna, such that the phase shift from one antenna to the next is the same for all the antennas.…”

Section: Phased‐array Radio Systemsmentioning

confidence: 99%

Unmanned aircraft flight control aided by phased‐array radio navigation

Gryte

Bryne

Johansen

2020

Journal of Field Robotics

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“…Parabolic reflector antennas 1 – 3 are the most popular for high-gain applications, but due to their non-planar configuration, there has been a strong interest to find planar alternatives. In contrast, high gain (> 30 dB) large arrays of low-gain radiating elements 4 – 6 are thin, planar and easily concealable but need a feeding network, which introduces additional complications and losses, particularly at millimetre wave frequencies. A reflectarray is a semi-planar solution where a planar array replaces the “dish”, yet it requires a horn or similar feed antenna at the focal distance 7 – 9 .…”

Section: Introductionmentioning

confidence: 99%

A dielectric free near field phase transforming structure for wideband gain enhancement of antennas

Ahmed

Afzal

Hayat

et al. 2021

Sci Rep

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The gain of some aperture antennas can be significantly increased by making the antenna near-field phase distribution more uniform, using a phase-transformation structure. A novel dielectric-free phase transforming structure (DF-PTS) is presented in this paper for this purpose, and its ability to correct the aperture phase distribution of a resonant cavity antenna (RCA) over a much wider bandwidth is demonstrated. As opposed to printed multilayered metasurfaces, all the cells in crucial locations of the DF-PTS have a phase response that tracks the phase error of the RCA over a large bandwidth, and in addition have wideband transmission characteristics, resulting in a wideband antenna system. The new DF-PTS, made of three thin metal sheets each containing modified-eight-arm-asterisk-shaped slots, is significantly stronger than the previous DF-PTS, which requires thin and long metal interconnects between metal patches. The third advantage of the new DF-PTS is, all phase transformation cells in it are highly transparent, each with a transmission magnitude greater than − 1 dB at the design frequency, ensuring excellent phase correction with minimal effect on aperture amplitude distribution. With the DF-PTS, RCA gain increases to 20.1 dBi, which is significantly greater than its 10.7 dBi gain without the DF-PTS. The measured 10-dB return loss bandwidth and the 3-dB gain bandwidth of the RCA with DF-PTS are 46% and 12%, respectively.

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