Simulation of helical modulation in a focal plane array

Vaishnavi, Vijay K.; Priya, V G; Devi, A Sharmila; Kumar, Madhwesh; Venkatesh, Suresh; Sundaram, G A Shanmugha

doi:10.1109/iccsp.2014.6950082

Cited by 8 publications

(2 citation statements)

References 5 publications

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“…According to the existing literature, it can be determined that the main methods of generating orbital angular momentum are: helical reflector structure [8], transmission helical structure [9], transmission grating structure [10], and array antenna [11,12]. At present, the method of using array antennas to excite vortex electromagnetic waves has been widely studied [13], but due to the high cost of phase-shifting devices in the array, it is not conducive to mass production and manufacturing.…”

Section: Introductionmentioning

confidence: 99%

A Topological Charge Continuously Tunable Orbital Angular Momentum (OAM) Electromagnetic Wave Generation Method Based on Fixed-length Delay Line Mixing Circuit

Zhou

Yao

et al. 2023

ACES Journal

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To overcome the drawback of complex structure and high cost attributed from the utilization of phase shifters to generate OAM in the conventional schemes, this paper proposes a new method for generating OAM based on a fixed delay line. By deriving the proposed system with fixed delay line theoretically, the relationship between the frequency of the input signal on the delay line and the topological charge of the OAM is obtained, and the topological charge of the generated OAM can be controlled by controlling the frequency. Furthermore, this paper proposes a vortex beam pointing control method based on phased array scanning, so as to realize the beam steering of OAM. It is then verified by using electromagnetic simulation, and the simulation results show that the proposed method is feasible. The proposed method not only has the advantages of simple structure and low cost, but also can generate OAM with continuously adjustable topological charge by controlling the frequency, which has the functions of topological charge reconstruction and dynamic adjustment.

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Section: Introductionmentioning

confidence: 99%

A Topological Charge Continuously Tunable Orbital Angular Momentum (OAM) Electromagnetic Wave Generation Method Based on Fixed-length Delay Line Mixing Circuit

Zhou

Yao

et al. 2023

ACES Journal

View full text Add to dashboard Cite

show abstract

“…The state-of-the-art OAM generation architectures can be mainly divided into four types, namely transmission helical structure [10], transmission grating structure [11], helical reflector structure [12] and array antenna [13,14]. When vortex electromagnetic waves were first proposed, the proponents described how to feed a uniform circular array to generate orbital angular momentum in the radio frequency band [15].…”

Section: Introductionmentioning

confidence: 99%

Phase-shifter-less Vortex Electromagnetic Wave Generation Technology with Tunable Topological Charge/Steering Angle under Random Initial Phase Condition of Phase-locked Source

Zhou

Yao

et al. 2023

ACES Journal

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This paper demonstrates how to implement a vortex electromagnetic wave generation system with beam steering using only delay lines as phase-shifting elements. The system is based on uniform circular array and phased array technology. A detailed theoretical derivation is presented, which yields an input frequency matrix corresponding to each target case. Furthermore, considering the random initial phase problem of the actual phase-locked source, the above scheme is further improved in this paper. By cleverly setting the circuit structure, the influence of the initial phase inconsistency on the phase control system is filtered out. The performance is verified by analytical calculations and full-wave electromagnetic simulations, which are in good agreement with the proposed theory. The scheme proposed in this paper can completely get rid of the phase shifter and realize the free adjustment of the topological charge number/beam steering angle. The adjustment accuracy depends on the tuning accuracy of the phase-locked source, which can achieved an accuracy over 1Hz at a cost of less than six dollars, which makes it an interesting and flexible low-cost vortex electromagnetic wave generation scheme.

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Modelling and Simulation of Terrestrial L-Band Radio Source Detection from Aerospace Platforms

Kovardhan

Vidya

Shree

et al. 2022

Lecture Notes in Networks and Systems

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Simulation of helical modulation in a focal plane array

Cited by 8 publications

References 5 publications

A Topological Charge Continuously Tunable Orbital Angular Momentum (OAM) Electromagnetic Wave Generation Method Based on Fixed-length Delay Line Mixing Circuit

A Topological Charge Continuously Tunable Orbital Angular Momentum (OAM) Electromagnetic Wave Generation Method Based on Fixed-length Delay Line Mixing Circuit

Phase-shifter-less Vortex Electromagnetic Wave Generation Technology with Tunable Topological Charge/Steering Angle under Random Initial Phase Condition of Phase-locked Source

Modelling and Simulation of Terrestrial L-Band Radio Source Detection from Aerospace Platforms

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