scholarly journals Patch size reduction of rectangular microstrip antennas by means of a cuboid ridge

2015 ◽  
Vol 9 (15) ◽  
pp. 1727-1732 ◽  
Author(s):  
Alireza Motevasselian ◽  
William G. Whittow
Keyword(s):  
Patch Size ◽  
Microstrip Antennas ◽  
Size Reduction

scholarly journals Critical patch size reduction by heterogeneous diffusion

2020 ◽  
Vol 102 (4) ◽  
Author(s):  
M. A. F. dos Santos ◽  
V. Dornelas ◽  
E. H. Colombo ◽  
C. Anteneodo
Keyword(s):  
Patch Size ◽  
Size Reduction ◽  
Critical Patch Size

scholarly journals Local extinctions of obligate frugivores and patch size reduction disrupt the structure of seed dispersal networks

Ecography ◽  
2018 ◽  
Vol 41 (11) ◽  
pp. 1899-1909 ◽  
Author(s):  
Jamille de Assis Bomfim ◽  
Paulo R Guimarães ◽  
Carlos A. Peres ◽  
Gustavo Carvalho ◽  
Eliana Cazetta
Keyword(s):  
Seed Dispersal ◽  
Patch Size ◽  
Size Reduction ◽  
Local Extinctions

Size reduction of microstrip antennas

2001 ◽  
Vol 37 (21) ◽  
pp. 1274 ◽  
Author(s):  
C.S. Lee ◽  
K.-H. Tseng
Keyword(s):  
Microstrip Antennas ◽  
Size Reduction

scholarly journals Electrical Size Reduction of Microstrip Antennas by Using Defected Ground Structures Composed of Complementary Split Ring Resonator

2021 ◽  
Vol 10 (1) ◽  
pp. 62-69
Author(s):  
E. M. Kucukoner ◽  
A. Cinar ◽  
U. Kose ◽  
E. Ekmekci
Keyword(s):  
Ring Resonator ◽  
Good Alternative ◽  
Split Ring Resonator ◽  
Microstrip Antennas ◽  
Size Reduction ◽  
Split Ring ◽  
Complementary Split Ring Resonator ◽  
Resonance Frequencies ◽  
Defected Ground Structures ◽  
Ground Structures

In this study the effects of using defected ground structures (DGS) composed of a complementary split ring resonator (CSRR) and CSRR with dumbbell (CSRR-D) for rectangular microstrip antennas are investigated. On this aim, two different antennas, which are Antenna B having CSRR etched DGS and Antenna C having CSRR-D etched DGS are designed and fabricated in comparison with the ordinary rectangular patch antenna, which is Antenna A. In both Antennas B and C, CSRR structures are etched in the same position of the ground planes. On the other hand, another ordinary microstrip antenna, called Antenna D, is designed at resonance frequency of Antenna C. For the characterization; resonance frequencies, voltage standing wave ratios, percentage bandwidths, gains, ka values and gain radiation patterns are investigated both in simulations and experiments. The numerical analyses show that 29.39% and 44.49% electrical size reduction (ESR) ratios are obtained for Antenna B and Antenna C, respectively in comparison to Antenna A. The experimental results verify the ESR ratios with 29.15% and 44.94%. Supporting, Antenna C promises 68.12% physical size reduction (PSR) as it is compared with Antenna D. These results reveal that Antenna C is a good alternative for DGS based microstrip electrically small antennas.

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

Energies ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 403
Author(s):  
Marzieh Mahrokh ◽  
Slawomir Koziel
Keyword(s):  
Penalty Function ◽  
Field Performance ◽  
Simulation Models ◽  
Microstrip Antennas ◽  
Size Reduction ◽  
Function Approach ◽  
Optimization Process ◽  
Antenna Miniaturization ◽  
Fidelity Model ◽  
Penalty Function Approach

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%.

scholarly journals Design of Rectangular Microstrip Antenna 1x2 Array for 5G Communication

2021 ◽  
Vol 2117 (1) ◽  
pp. 012028
Author(s):  
A Irfansyah ◽  
B B Harianto ◽  
N Pambudiyatno
Keyword(s):  
Microstrip Antenna ◽  
Patch Size ◽  
Return Loss ◽  
Microstrip Antennas ◽  
Substrate Material ◽  
Antenna Design ◽  
Gain Bandwidth ◽  
Rectangular Patch ◽  
Rectangular Microstrip Antenna ◽  
Made In

Abstract Microstrip antennas are currently popular because they have the advantage and meet the demand for small and lightweight antennas so that they are compatible and easy to integrate. This study aims to design an antenna microstrip rectangular 1x2 array, a rectangular patch microstrip antenna consisting of two elements. The antenna has a patch size of 19.5 mm x 26.5 mm array 1x2 with a frequency of 3.5 GHz. The antenna design is made in a simulation that works at a frequency of 3.5 GHz, and the substrate material is made of FR 4, which has a constant (ε r of) of 4.3, while patch materials are made of copper. Calculating the value of the initial antenna parameters will be optimized by sweeping the parameters to obtain the desired return loss, VSWR, gain, bandwidth, and directivity. The results of optimization of the rectangular microstrip antenna design 1x2 array work at a frequency of 3.5 GHz with a return loss -12.54 dB in the frequency range 3. 47 GHz up to 3.53 GHz, bandwidth 66.5 MHz, VSWR value of 1.6 and produce a gain of 5.5 dB.

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