scholarly journals Broadband RCS Reduction of Antenna with AMC Using Gradually Concentric Ring Arrangement

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Fuwei Wang ◽  
Yuhui Ren ◽  
Ke Li
Keyword(s):  
Phase Shift ◽  
Phase Difference ◽  
Frequency Band ◽  
New Method ◽  
Concentric Ring ◽  
Magnetic Conductor ◽  
Artificial Magnetic Conductor ◽  
Reflection Phase ◽  
Zero Degree ◽  
Incident Waves

This paper proposes a new method to the broadband RCS reduction with the artificial magnetic conductor (AMC) surfaces. The AMC surfaces can introduce a zero-degree reflection phase shift to incident waves. The phase difference between the antenna and AMC structures is 180°. Therefore, the AMC structures can be used to achieve RCS reduction. However, the bandwidth of zero-degree reflection phase of AMC structures is very narrow. In light of this, a novel gradually concentric ring arrangement AMC (GCRA-AMC) which can be applied to achieve the broadband RCS reduction is presented. The simulated and measured results show that the radiation performance of antennas is preserved when the GCRA-AMC is used. The RCS of the antenna with GCRA-AMC has been considerably reduced in a broad frequency band. The largest RCS reduction is more than 17 dB.

scholarly journals Low Scattering Microstrip Antenna Based on Broadband Artificial Magnetic Conductor Structure

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 750 ◽  
Author(s):  
Muhammad Saleem ◽  
Xiao-Lai Li
Keyword(s):  
Microstrip Antenna ◽  
Energy Reduction ◽  
Destructive Interference ◽  
Magnetic Conductor ◽  
Artificial Magnetic Conductor ◽  
Reflection Phase ◽  
Radiation Properties ◽  
Unit Cells ◽  
Zero Degree ◽  
A New Technique

In this summary, we have suggested a new technique in which destructive interference principle is incorporated into a chessboard like a reflective screen, and the proposed antenna realizes a remarkable in-band and also out-of-band backscattered energy reduction by using a metasurface (MS). Two different MS unit cells are designed to provide the resonant frequency with a zero-degree reflection phase. Metasurface unit cells are configured in a chessboard-like reflector screen to achieve the reflection phase difference of 180° ± 37° over a broadband range of frequencies to redirect the scattering field into four quadrants. It is implemented to reduce the backscattered energy level of the microstrip antenna, which is based on destructive interference principle. The simulations indicate that the proposed antenna possesses significant backscattered energy reduction from 6 GHz to 16 GHz in both x– and y– polarization and also −10 dB backscattering reduction at antenna working band (7.4–7.8 GHz) is covered. Moreover, the radiation performance is preserved well and artificial magnetic conductor (AMC) unit cells work at different frequencies which are not influenced on the radiation properties. The bistatic performance of the antenna at different frequencies is also presented. Measurements and simulations of the fabricated design coincide well and the proposed design is verified and validated successfully.

A wideband, compact, high gain, low-profile, monopole antenna using wideband artificial magnetic conductor for off-body communications

2021 ◽  
pp. 1-10
Author(s):  
Bidisha Hazarika ◽  
Banani Basu ◽  
Arnab Nandi
Keyword(s):  
High Gain ◽  
Monopole Antenna ◽  
Impedance Bandwidth ◽  
Magnetic Conductor ◽  
Artificial Magnetic Conductor ◽  
Reflection Phase ◽  
Low Profile ◽  
Independent Behavior ◽  
Integrated Antenna ◽  
Body Loading

Abstract A wideband staircase pattern defected ground monopole antenna integrated with an artificial magnetic conductor (AMC) reflector has been proposed for C-band (4–8 GHz) and ITU band (8.01–8.5 GHz) applications. The integrated antenna consists of a staircase antenna at top, a 2 × 2 AMC reflector at the bottom and an air substrate as gap between them. The AMC offers 18.5% ± 90° reflection phase bandwidth from 6.10 to 7.32 GHz. The AMC layer has achieved mu-negative properties in the designated band. The AMC proffers polarization independent behavior in the respective frequency band depicting robustness in AMC reflection phase characteristics. The integrated antenna has offered a wide impedance bandwidth of 2.78 GHz (42.8% at 6.5 GHz and 34.1% at 8.15 GHz) due to the defected ground monopole. The integration of wideband AMC beneath the staircase monopole antenna alters the out of phase radiation to in-phase planer pattern which enhances the peak gain up to 9.7 dB. It reduces the 1-g averaged specific absorption rate to 0.223 and 0.324 W/kg at the two designated bands. The structure maintains almost similar bandwidth and gain due to artificial human body loading.

scholarly journals Broadband metasurfaces loaded with non-Foster elements

2021 ◽  
Vol 2015 (1) ◽  
pp. 012061
Author(s):  
Nikita Kalmykov ◽  
Bair Buiantuev ◽  
Dmitry Kholodnyak
Keyword(s):  
Frequency Band ◽  
Conversion Error ◽  
Magnetic Conductor ◽  
Bandwidth Extension ◽  
Artificial Magnetic Conductor ◽  
Low Profile ◽  
Low Profile Antennas ◽  
Unit Cells ◽  
Operational Frequency ◽  
Impedance Converter

Abstract Metasurfaces have been widely used to design low-profile antennas, thin absorbers, lenses etc. The operational frequency band of a metasurface is rather narrow due to its resonant nature. Loading metasurface unit cells with non-Foster elements allows for remarkable bandwidth extension. In this paper, design of a broadband metasurface to operate as an artificial magnetic conductor is considered. The main issues which influence the bandwidth extension such as implementation of the non-Foster load, minimization of conversion error of a negative impedance converter, and circuit stabilization are addressed.

Novel Artificial Magnetic Conductor for 5G Application

2017 ◽  
Vol 5 (3) ◽  
pp. 636 ◽  
Author(s):  
Maizatun Muhamad ◽  
Maisarah Abu ◽  
Zahriladha Zakaria ◽  
Hasnizom Hassan
Keyword(s):  
Band Gap ◽  
Angular Stability ◽  
The Novel ◽  
Magnetic Conductor ◽  
Dispersion Diagram ◽  
Artificial Magnetic Conductor ◽  
Patch Shape ◽  
Reflection Phase ◽  
Specific Frequency

A design of novel bendable Artificial Magnetic Conductor (AMC) structures has been presented in this paper in two selected of frequencies at 5G application. These designs started with a square patch shape and continued with the combination of circular and Jerusalem shape which resonate at a frequency of 18 GHz and 28 GHz. Details of the theory and the structures of AMCs are explained. The reflection phase, bandwidth, angular stability and dispersion diagram were studied. The simulated results plotted that the novel AMC has good bandwidth and size is reduced by 53 percent and 55 percent for both frequencies. Other than that, it is also proved that the novel AMC has a stable reflection phase and no band gap performs at the specific frequency. The good performances of this novel AMC make it useful in order to improve antenna’s performance.

scholarly journals A Low-Profile HF Meandered Dipole Antenna with a Ferrite-Loaded Artificial Magnetic Conductor

2021 ◽  
Vol 11 (5) ◽  
pp. 2237
Author(s):  
Oh Heon Kwon ◽  
Won Bin Park ◽  
Juho Yun ◽  
Hong Jun Lim ◽  
Keum Cheol Hwang
Keyword(s):  
High Frequency ◽  
Dipole Antenna ◽  
Unit Cell ◽  
Operating Frequency ◽  
High Permeability ◽  
Magnetic Conductor ◽  
Artificial Magnetic Conductor ◽  
Low Profile ◽  
Compact Size ◽  
Binary Genetic Algorithm

In this paper, a low-profile HF (high-frequency) meandered dipole antenna with a ferrite-loaded artificial magnetic conductor (AMC) is proposed. To operate in the HF band while retaining a compact size, ferrite with high permeability is applied to the unit cell of the AMC. The operating frequency bandwidth of the designed unit cell of the AMC is 1.89:1 (19–36 MHz). Thereafter, a meandered dipole antenna is designed by implementing a binary genetic algorithm and is combined with the AMC. The overall size of the designed antenna is 0.06×0.06×0.002 λ3 at the lowest operating frequency. The proposed dipole antenna with a ferrite-loaded AMC is fabricated and measured. The measured VSWR bandwidth (<3) covers 20–30 MHz on the HF band. To confirm the performance of the antenna, a reference monopole antenna which operates on the HF band was selected, and the measured receiving power is compared with the result of the proposed antenna with the AMC.

Highly efficient artificial magnetic conductor enabled CPW fed compact antenna for BAN wearable applications

Frequenz ◽  
2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Maksud Alam ◽  
Amber Khan ◽  
Mainuddin ◽  
Binod Kumar Kanaujia ◽  
Mirza Tariq Beg
Keyword(s):  
Coplanar Waveguide ◽  
Split Ring Resonator ◽  
Area Network ◽  
Network Analyzer ◽  
Magnetic Conductor ◽  
Split Ring ◽  
Artificial Magnetic Conductor ◽  
Compact Antenna ◽  
Resonant Modes ◽  
Miniaturized Antenna

AbstractIn this paper a coplanar waveguide feed (CPW) monopole antenna backed with artificial magnetic conductor (AMC) structure for efficient radiation has been presented for off-body wearable applications. A split ring resonator (SRR) having thiner and longer lines to produce higher inductance and six splits with smaller gaps for high capacitance have been placed underneath CPW fed monopole to achieve resonance mode at a lower frequency. Higher values of inductance and capacitance produce resonant modes at relatively lower frequencies resulting in highly miniaturized antenna. The desired −10dB S11 bandwidth has been optimized firstly, by tuning/optimizing flow of surface currents with the help of several slots/slits and later by realizing AMC reflector with the help of full ground backed foam. The proposed antenna covers 2.45 GHz industrial, scientific and medical (ISM) band body area network (BAN) application and posses good front to back ratio (FBR) and thereby low and acceptable values of specific absorption rate (SAR). The proposed antenna has been designed and simulated using Ansys high frequency structured simulator and tested using vector network analyzer and anechoic chamber. The simulated and measured results well agree with each other.

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