Compact and broadband circular polarized Microstrip Antenna with wideband Axial-Ratio bandwidth

Malekabadi, S.A.; Attari, Amir Reza; Mirsalehi, Mir Mojtaba

doi:10.1109/istel.2008.4651281

Cited by 10 publications

(3 citation statements)

References 4 publications

(4 reference statements)

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“…• A monopole antenna with L-shaped ground plane stub [57], Antenna I; • A monopole antenna with a radiator slot and modified ground plane [58], Antenna II; • A monopole antenna with two radiator slots and elliptical ground plane slit [59], Antenna III; • A stacked circular polarization antenna with circular and annular slots [60], Antenna IV; • A stacked circular polarization antenna with a cross-shaped radiator slot [61], Antenna V. The relevant data for all structures is shown in Table 1. This includes the target operating bandwidths as well as design constraints.…”

Section: Benchmark Antenna Structuresmentioning

confidence: 99%

Improved-Efficacy EM-Based Antenna Miniaturization by Multi-Fidelity Simulations and Objective Function Adaptation

Mahrokh

Koziel

2022

Energies

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The growing demand for the integration of surface mount design (SMD) antennas into miniaturized electronic devices has imposed increasing limitations on the structure dimensions. Examples include embedded antennas in applications such as on-board devices, picosatellites, 5G communications, or implantable and wearable devices. The demands for size reduction while ensuring a satisfactory level of electrical and field performance can be managed through constrained numerical optimization. The reliability of optimization-based size reduction requires utilization of full-wave electromagnetic (EM) analysis, which entails significant computational costs. This can be alleviated by incorporating surrogate modeling techniques, adjoint sensitivities, or the employment of sparse sensitivity updates. An alternative is the incorporation of multi-fidelity simulation models, normally limited to two levels, low and high resolution. This paper proposes a novel algorithm for accelerated antenna miniaturization, featuring a continuous adjustment of the simulation model fidelity in the course of the optimization process. The model resolution is determined by factors related to violation of the design constraints as well as the convergence status of the algorithm. The algorithm utilizes the lowest-fidelity model for the early stages of the optimization process; it is gradually refined towards the highest-fidelity model upon approaching convergence, and the constraint violations improve towards the preset tolerance threshold. At the same time, a penalty function approach with adaptively adjusted coefficients is applied to enable the precise control of constraints, and to increase the achievable miniaturization rates. The presented procedure has been validated using five microstrip antennas, including three broadband, and two circularly polarized structures. The obtained results corroborate the relevance of the implemented mechanisms from the point of view of improving the average computational efficiency of the optimization process by 43% as compared to the single-fidelity adaptive penalty function approach. Furthermore, the presented methodology demonstrates a performance that is equivalent or even superior to its single-fidelity counterpart in terms of an average constraint violation of 0.01 dB (compared to 0.03 dB for the reference), and an average size reduction of 25% as compared to 25.6%.

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Section: Benchmark Antenna Structuresmentioning

confidence: 99%

Improved-Efficacy EM-Based Antenna Miniaturization by Multi-Fidelity Simulations and Objective Function Adaptation

Mahrokh

Koziel

2022

Energies

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“…Figure 3 shows the geometries of the two benchmark structures (Antenna I [32], and Antenna II [33]) employed for verification purposes. Antenna I is a stacked microstrip patch structure supposed to be optimized within the frequency band 5.36 GHz to 5.9 GHz, whereas, Antenna II is a circular patch structure with annular and rectangular slots, to be optimized within a frequency band from 8.1 GHz to 8.3 GHz.…”

Section: B Verification Examples and Experimental Setupmentioning

confidence: 99%

Explicit Size-Reduction of Circularly Polarized Antennas Through Constrained Optimization With Penalty Factor Adjustment

Mahrokh

Koziel

2021

IEEE Access

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Modern communication systems of high data capacity incorporate circular polarization (CP) as the preferred antenna radiation field configuration. In many applications, integration of the system circuitry with antennas imposes size limitations on CP radiators, which makes their development process a challenging endeavor. This can be mitigated by means of simulation-driven design, specifically, constrained numerical optimization. Majority of the performance-related constraints are expensive to evaluate, i.e. require full-wave electromagnetic (EM) analysis of the system. Their practical handling can be realized using a penalty function approach, where the primary objective (antenna size reduction) is complemented by contributions proportional to properly quantified constraint violations. The coefficients determining the contribution of the penalty terms are normally set up using designer's experience, which is unlikely to render their optimum values in terms of the achievable miniaturization rates as well as constraint satisfaction. This letter proposes a procedure for automated penalty factor adjustment in the course of the optimization process. Our methodology seeks for the most suitable coefficient levels based on the detected constraint violations and feasibility status of the design. It is validated using two CP antenna structures. The results demonstrate a possibility of a precise constraint control as well as superior miniaturization rates as compared to the manual penalty term setup.

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“…As we know, antennas with circular polarization (CP) [15][16][17][18][19][20][21][22][23][24][25] can reduce polarization mismatch between transmitting and receiving antennas in wireless communication systems. However, most of the previous work on the hybrid DRAs, which makes use of the resonance of the feeding structure, was primarily concentrated on linearly polarized designs.…”

Section: Introductionmentioning

confidence: 99%

Investigation of a Cross-Slot-Coupled Dual-Band Circularly Polarized Hybrid Dielectric Resonator Antenna

Zou¹,

Pan²,

Zuo³

et al. 2014

PIER C

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Abstract-In this paper, a cross-slot-coupled dual-band circularly polarized (CP) hybrid dielectric resonator antenna (DRA) is presented. The design concept is based on using a cross-slot as both a feeding structure of the DRA and an effective radiator. Full wave simulation is used to verify the proposed design concept in this paper. A prototype antenna is designed, fabricated, and measured. Good agreement is obtained between the simulated and measured results.

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Compact and broadband circular polarized Microstrip Antenna with wideband Axial-Ratio bandwidth

Cited by 10 publications

References 4 publications

Improved-Efficacy EM-Based Antenna Miniaturization by Multi-Fidelity Simulations and Objective Function Adaptation

Improved-Efficacy EM-Based Antenna Miniaturization by Multi-Fidelity Simulations and Objective Function Adaptation

Explicit Size-Reduction of Circularly Polarized Antennas Through Constrained Optimization With Penalty Factor Adjustment

Investigation of a Cross-Slot-Coupled Dual-Band Circularly Polarized Hybrid Dielectric Resonator Antenna

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