Design of a compact multilayer circularly polarized phased array transmit antenna system for satellite applications

Moghaddam, Elham Sharifi

doi:10.1016/j.aeue.2016.05.011

Cited by 11 publications

(1 citation statement)

References 9 publications

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“…As a result, the GA optimization converges to the global solution and stays away from local extremes. Details about the GA and its related parameters were presented in [15–18].…”

Section: Antenna Design Examplementioning

confidence: 99%

Synthesis technique of a low-profile multiple sub-beam phased array antenna for high-throughput satellite applications

Moghaddam

Ahmadi

2020

Int. J. Microw. Wireless Technol.

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Sub-beam concept is very useful for size reduction of multiple beam phased array antenna (PAA) systems that are applied for high-throughput communication satellites. In this paper, the synthesis procedure for a PAA with multiple sub-beams in two dimensions of the coverage domain is proposed and analyzed. In the design procedure, the interleaved sub-arraying technique has been applied to eliminate the grating lobes. The extremely short angular distance between adjacent sub-beams is challenging. An innovative beam forming network is proposed, which can generate multiple orthogonal sub-beams while keeping the required angular distance between sub-beams. To demonstrate the effectiveness of the design technique, an example considering the requirements derived from conceptual design of a high-throughput communication payload is presented. The array is optimized using the genetic algorithm while taking into account the technical requirements of the antenna. The gain patterns exhibit a 0.4° angular distance between adjacent sub-beams. In addition, the number of sub-arrays and element spacing guarantee the orthogonality of the sub-beams. The calculated carrier to interference ratio in the synthesized array shows that it has acceptable values in each spot. The aperture size reduction in the synthesized array compared to a conventional multiple beam array is more than 36.7%.

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“…As a result, the GA optimization converges to the global solution and stays away from local extremes. Details about the GA and its related parameters were presented in [15–18].…”

Section: Antenna Design Examplementioning

confidence: 99%

Synthesis technique of a low-profile multiple sub-beam phased array antenna for high-throughput satellite applications

Moghaddam

Ahmadi

2020

Int. J. Microw. Wireless Technol.

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A new extraction flow of the s mall‐signal s witch‐HEMT model based on the parasitic resistance scanning algorithm

Popov

Добуш

Salnikov

2022

Int J RF Mic Comp-Aid Eng

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Recent research interest in switch High Electron Mobility Transistor (HEMT) modeling revealed the special modeling requirement that is a parasitic capacitance shell surrounding the equivalent circuit. Despite the robust determination of parasitic capacitances, one still may face several problems when extracting a small-signal switch-HEMT model. Practical switch-HEMT test structures include different configurations of gate network with additional microstrip lines, large-value resistors, and via-holes. Ignoring parts of these networks results in unfavorable errors when comparing measured and simulated results. Another problem may arise when extracting the switch-HEMT equivalent circuit parameters from the measured S-parameters of the grounded gate test structures: obtained parasitic resistances can be exaggerated, resulting in negative values of intrinsic channel resistance (conductance). This paper presents a new switch-HEMT extraction flow intended to address the mentioned challenges. To eliminate an excessive gate inductance attributed to via-hole, we introduce a concept of the gate network de-embedding. A negative channel resistance (conductance) problem is handled by applying a new parasitic resistance scanning algorithm that allows finding the model parameter vector with reasonable positive values in the vicinity of the Sparameters modeling error minimum. Accurate S-parameters modeling results verify the proposed extraction flow. Obtained small-signal switch-HEMT models are validated by designing and manufacturing a 2 dB digital step attenuator section.

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Broadband artistic antenna array composed of circularly-polarized Wang-shaped patch elements

Chung

Zhang

2017

AEU - International Journal of Electronics and Communications

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Design of a compact multilayer circularly polarized phased array transmit antenna system for satellite applications

Cited by 11 publications

References 9 publications

Synthesis technique of a low-profile multiple sub-beam phased array antenna for high-throughput satellite applications

Synthesis technique of a low-profile multiple sub-beam phased array antenna for high-throughput satellite applications

A new extraction flow of the s mall‐signal s witch‐HEMT model based on the parasitic resistance scanning algorithm

Broadband artistic antenna array composed of circularly-polarized Wang-shaped patch elements

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