scholarly journals NOVEL IMPEDANCE MATCHING SCHEME FOR PATCH ANTENNAS

2010 ◽  
Vol 14 ◽  
pp. 155-163 ◽  
Author(s):  
Xiao-Dong Huang ◽  
Xiu-Hua Jin ◽  
Chong-Hu Cheng
Keyword(s):  
Impedance Matching ◽  
Patch Antennas

Dual-band linearly and circularly polarized microstrip patch antennas with meandering slot and metallic vias

2015 ◽  
Vol 9 (2) ◽  
pp. 341-348 ◽  
Author(s):  
Jin Zhang ◽  
Xianqi Lin ◽  
Jiawei Yu ◽  
Liying Nie
Keyword(s):  
Linear Polarization ◽  
Impedance Matching ◽  
Single Band ◽  
Dual Band ◽  
Patch Antennas ◽  
Circularly Polarized ◽  
Microstrip Patch Antennas ◽  
Microstrip Patch ◽  
Measurement Results ◽  
Simulation Results

Patch antennas with a meandering slot and different distributions of grounded metallic vias are presented in this paper. The meandering slot is adopted to stimulate dual-band operation, while the number and position of the grounded metallic vias are suggested to achieve different radiation performances. The characteristics are analyzed in detail where we find that the existence of the vias also improves the impedance matching. Four samples are designed, where dual-band with both linear polarization, dual-band with circular- and linear-polarization, and single band with linear polarization are obtained, respectively. The samples are finally fabricated and the measurement results agree well with the simulation results.

Design of triangular shaped slotted patch antennas for both wideband and multiband applications

2022 ◽  
pp. 1-20
Author(s):  
Rajib Kumar Dash ◽  
Puspendu Bikash Saha ◽  
Dibyendu Ghoshal ◽  
Gopinath Palai
Keyword(s):  
Fractal Geometry ◽  
Parametric Analysis ◽  
Impedance Matching ◽  
Ground Plane ◽  
Ring Resonators ◽  
Patch Antennas ◽  
Split Ring ◽  
Split Ring Resonators ◽  
Measurement Results ◽  
Polarized Radiation

In this article two fractal geometry-based slotted patch antennas are designed to achieve wideband response with multiband characteristics and reduced cross polarized radiation in both E- and H-plane for all the resonating bands. The proposed antennas are fed with microstrip line feeding formed on a FR4 substrate of size 0.25𝜆0 × 0.25𝜆0 × 0.02𝜆0 mm3 and loaded with a partial ground plane at the bottom of the substrate. HFSS is used to design and simulate both the antennas. Wideband behavior and impedance matching of Antenna-1 are improved by optimizing the factor of iteration and length of the ground plane. Due to addition of 3 identical split ring resonators (SRR) with the antenna geometry leads to achieve multiband response in Antenna-2. The dimensions of the SRR connectors and feedline have been optimized through parametric analysis to match the impedance properly at all the three resonating bands. It has been found that simulated and measurement results of both the antennas are properly matched.

scholarly journals Global Synthesis Method for the Optimization of Multifeed EBG Antennas

2008 ◽  
Vol 2008 ◽  
pp. 1-6 ◽  
Author(s):  
Julien Drouet ◽  
Marc Thevenot ◽  
Régis Chantalat ◽  
Cyrille Menudier ◽  
Majed Koubeissi ◽  
...  
Keyword(s):  
Radiation Pattern ◽  
Impedance Matching ◽  
Synthesis Method ◽  
Patch Antennas ◽  
Novel Technique ◽  
Numerical Design ◽  
Feed Network

This paper presents a novel technique for synthesizing a given radiation pattern from an EBG antenna with an array feed. The method determines the optimum sets of input waves and input impedances for the feed ports in order to perform simultaneously the radiation pattern and the impedance matching of all the radiating probes that form the array feed. The method is validated through a numerical design of an EBG antenna excited with four patch antennas. The structure is designed to radiate with a single lobe scanned at in the E-plane. The interactions between each patch inside the EBG resonator are characterized with the CST MWS software. The optimum weights and the input impedances which simultaneously perform the objective radiation and the matching of all feeding ports are calculated by the developed global synthesis method. The feed network is designed with the Agilent ADS software in order to perform the specified weights and the impedances matching.

scholarly journals Improving the Performances of Microstrip Antenna Array using Defected Ground Structure

2020 ◽  
Vol 9 (3) ◽  
pp. 1081-1086
Keyword(s):  
Antenna Array ◽  
Power Distribution ◽  
Mutual Coupling ◽  
Impedance Matching ◽  
Side Lobe ◽  
Power Divider ◽  
Side Lobe Level ◽  
Patch Antennas ◽  
Defected Ground Structure ◽  
Ground Structure

In this paper, a two elements antenna array with defective ground structure (DGS) has been designed to achieve significant gain, polarization purity and reduced mutual coupling. A 3 port Wilkinson power divider has been designed at 4.5 GHz frequency to obtain equal power distribution at the output ports. Two Rectangular microstrip patch antennas with DGS at the corners yield improved gain, impedance matching and polarization purity in both E and H plane. The reduction of mutual coupling and side lobe level (SLL) have been achieved by placing the dumbbell shaped DGS bellow the feed line of the power divider. The radiation performances obtained using the fabricated prototype agrees well with that of the simulated one. This array has been designed for C-band application.

scholarly journals Analysis Method of Bending Effect on Transmission Characteristics of Ultra-Low-Profile Rectangular Microstrip Antenna

Sensors ◽  
2022 ◽  
Vol 22 (2) ◽  
pp. 602
Author(s):  
Jiaying Zhang ◽  
Jin Huang ◽  
Peng Sun ◽  
Fanbo Meng ◽  
Jie Zhang ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Impedance Matching ◽  
Equivalent Circuit Model ◽  
Microstrip Antennas ◽  
Effective Dielectric Constant ◽  
Patch Antennas ◽  
Rectangular Patch ◽  
Low Profile ◽  
Communication Devices ◽  
Rectangular Microstrip Antenna

With the advent of wearable communication devices, microstrip antennas have developed multiple applications due to their ultra-low-profile properties. Therefore, it is essential to analyze the problem of frequency shift and impedance mismatch when the antenna is bent. For the case of a rectangular patch antenna E-plane bent on the cylindrical surface, (1) this paper introduces the effective dielectric constant into the cavity model, which can accurately predict the resonance frequency of the antenna, and (2) according to the equivalent circuit model of the antenna resonance mode, the lumped element parameters are calculated based on the above effective dielectric constant, so that impedance characteristics and the S-parameter matching the port can be quickly constructed. From the perspective of circuit frequency characteristics, it explains the change in the transmission performance of the curved antenna. The experimental results show that the maximum difference between the experimental and theoretical calculation frequencies is less than 1%. These results verify the validity and applicability of the theory in the analysis of ultra-low-profile patch antennas and wearable electronic communication devices. It provides a theoretical basis for the fast impedance matching of patch antennas under different working conditions.

Modeling and constructing the microstrip notch-loaded rectangular S-shaped patch antennas using L-strip feeding for multi-band frequency performances in the recent wireless telecommunication systems

2015 ◽  
Vol 8 (8) ◽  
Author(s):  
Mohammad Alibakhshi-Kenari
Keyword(s):  
Impedance Matching ◽  
Patch Antennas ◽  
Method Of Moment ◽  
Cross Sectional ◽  
Band Frequency ◽  
Rectangular Patch ◽  
Telecommunication Systems ◽  
Resonant Modes ◽  
Wireless Telecommunication ◽  
Selection Of

In this article, the interesting constructions of the notch-loaded rectangular patch S-shaped antennas with L-strip feeding for multiband operations are presented. Implementing the L-strip feeding leads to creation of good benefits including several resonating frequencies, no cross-sectional area, simplicity in designing and constructing, stable gains and efficiencies, and the impedance matching. The proposed antennas are realized on the different substrate materials and the dramatic changes in characteristics are reported. These antennas are simulated, tooled, fabricated, and tested to provide the better performances in terms of return loss and bandwidth. Through the proper selection of the dimensions as well as the arrangement of the L-strip, the desired resonant modes of the antennas are excited in between 6–45, 3–20, and 2–16 GHz. Results of the radiation patterns, gains, and efficiencies of the constructed antenna on the foam substrate are studied and discussed. The maximum and minimum values of the gains and radiation efficiencies of this antenna are 10 dBi and 93%, and 1 dBi and 30%, respectively. The simulation results are obtained using method of moment based on the electromagnetic solver IE3D and are in good agreements with the experimental results, which were obtained from the spectrum analyzer.

A Broadband Impedance-Matching Method for Microstrip Patch Antennas Based on the Bode-Fano Theory

Frequenz ◽  
2018 ◽  
Vol 72 (7-8) ◽  
pp. 373-380
Author(s):  
Christopher M. A. Bonenberger ◽  
Klaus W. Kark
Keyword(s):  
Input Impedance ◽  
Low Cost ◽  
Impedance Matching ◽  
Single Mode ◽  
Wide Band ◽  
Low Complexity ◽  
Microstrip Antennas ◽  
Patch Antennas ◽  
Linearly Polarized ◽  
Matching Techniques

Abstract Considering the narrow bandwidth of microstrip antennas, but also their applicability in upcoming technologies, this paper addresses the problem of wide-band matching, the theoretical bounds on the matching bandwidth and low-cost and low-complexity matching strategies. In this context the Bode-Fano bounds of single mode, linearly polarized aperture-coupled microstrip antennas is evaluated, optimized and compared to the theoretical bounds on matching bandwidth of other common feeding technologies. A detailed study of the input impedance of aperture-coupled patch antennas shows how to widen the Fano bounds. Based on this, a straight-forward and effective method to optimize the Fano bound is given. After optimization of the antennas input impedance, basic matching techniques can be applied, to exploit the enlarged bandwidth potential. As an example a $\lambda/4$-transformer as matching element is proposed. Design equations and simulation and measurement results of X-band prototypes are given as verification.

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