Gain‐enhanced antenna backed with the fractal artificial magnetic conductor

Zhang, Binzhen; Yao, Pei; Duan, Junping

doi:10.1049/iet-map.2017.1130

Cited by 16 publications

(14 citation statements)

References 16 publications

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“…In [136], the design of a flexible fractal EBG evaluates its performance impact on a wearable CPW antenna in the frequency range 20-40 GHz. A novel fractal AMC with a bandwidth of 5.1-7.4 GHz (36.5%) is applied [137] in a monopole antenna as a back-cavity for low profile and radiation performance improvement. A miniaturized hexagonal-triangular fractal antenna is presented in [138] for wide-band applications that offered the bandwidth of 3-25.2 GHz.…”

Section: International Journal Of Microwave and Wireless Technologiesmentioning

confidence: 99%

Fractal antennas and arrays: a review and recent developments

Karmakar

2020

Int. J. Microw. Wireless Technol.

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In mathematical definition, a fractal is a self-similar subset of Euclidean space whose fractal dimension strictly exceeds its topological dimension which in turn involves a recursive generating methodology that results in contours with infinitely intricate fine structures. Fractal geometry has been used to model complex natural objects such as clouds coastlines, etc., that has space-filling properties. In the past years, several groups of scientists around the globe tried to implement the structure of fractal geometry for applications in the field of electromagnetism, which led to the development of new innovative antenna configurations called “fractal antennas” which is primarily focused in fractal antenna elements, and fractal antenna arrays. It has been demonstrated that by exploiting the recursive nature of fractals, several marvellous kinds of properties can be observed in antennas and arrays. The primary focus of this article is to provide a compressed overview of the developments in fractal-shaped antennas as well as arrays over the last few decades where the most prominent contributions mostly from IEEE journals have been highlighted. The open intention of this review work is to show an encouraging path to antenna researchers for its advancement using fractal geometries.

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Section: International Journal Of Microwave and Wireless Technologiesmentioning

confidence: 99%

Fractal antennas and arrays: a review and recent developments

Karmakar

2020

Int. J. Microw. Wireless Technol.

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“…This problem even becomes more severe for a multiband antenna especially in lower frequency bands . In this regard, however, metamaterial antennas become the alternative candidates for different communication bands to improve antenna performance characteristics by using metamaterial units as a load on/near the patch, loading/etching from the ground plane, integrating inside the substrate, or making them as superstrate …”

Section: Applications Of Metamaterials In Antenna Engineeringmentioning

confidence: 99%

“…AMC formed from an array of modified H‐shaped units located at the back of a triple‐band antenna substrate improved the gain by 2.39, 3.07, and 3.58 dBi at corresponding frequencies of 3.36, 5.96, and 9.09 GHz. A patch antenna resonating at 6.4 GHz has been with a fractal grid of AMC metamaterial layer ground to improve the gain by 4 dB and widen the operating frequency in the range of 5.1 to 7.4 GHz.…”

Section: Applications Of Metamaterials In Antenna Engineeringmentioning

confidence: 99%

Application of metamaterials for performance enhancement of planar antennas: A review

Tadesse

Acharya

Sahu

2020

Int J RF Microw Comput Aided Eng

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Metamaterials are assemblies of metallic and/or dielectric materials with properties that are not readily found in naturally existing materials. Hence, metamaterial structures are commonly loaded on/near the patch, embedded in the substrate, loaded/etched from the ground plane or placed as a superstrate layer for enhancing bandwidth and gain, and size miniaturization of conventional patch antennas. The demand for wide bandwidth, high gain, and compact antennas is highly contemplated in recent wireless communication research studies. Despite their lightweight, ease of fabrication, low profile, and simplicity for integration, patch antennas have performance limitations as result of their narrow bandwidth, lower gain, larger size, and lower power handling capacity. To address these problems, metamaterial‐based antennas have gained massive interest. There exist inadequate literatures about review of current state of extensive study reports on metamaterial application for patch antenna performance enhancement. Thus, this paper has reviewed and discussed latest research works on metamaterial applications for performance enhancement of planar patch antennas.

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“…Moreover, as the need for smaller and multi-functional wireless devices increases, the incorporation of various techniques onto the design of an antenna radiator to achieve such objectives complicates the optimization process of the antenna. Examples of techniques to enable miniaturization and bandwidth widening include the incorporation of slots onto the antenna patch and metamaterial-based methods [7]. One of the popular types of metamaterials in planar form is the artificial magnetic conductor (AMC).…”

Section: Introductionmentioning

confidence: 99%

Gain Optimization of Low-Profile Textile Antennas Using CMA and Active Mode Subtraction Method

et al. 2021

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This paper presents an active mode subtraction method based on the characteristic mode analysis to estimate the forward directivity based on the difference in modal significance curves. This made the optimization of the antenna gain in the design process to be more efficient. To the best of the authors' knowledge, such method is innovative and proposed in literature for the first time. This method is derived on the basis that the total radiated field of the antenna, and consequently, the directivity is mainly contributed by the excited dominant modes. To demonstrate its effectiveness, three compact, planar, and wearable antennas with increasing complexity will be designed and optimized using this method. The first is a conventional circular patch antenna operating at 5.3 GHz, whereas the second one is a planar loop antenna operating at 3.08 GHz. The third design is a crown-shaped planar antenna (CPA) with a 3 × 3 artificial magnetic conductor (AMC) plane integrated underneath to reduce potential coupling effects from the body. All three antennas are made fully using textiles with the same thicknesses: felt fabric as its substrate and ShieldIt Super as its conductive textile. For all designs, the use of the proposed method, which is validated using the method of moments, has predicted the maximum direction of radiation and its respective gain at the desired frequencies with good accuracy. Besides that, the design of the AMC plane for the CPA is also optimized using CMA prior to the integration with the antenna and a leather wrist strap. Measurements of the final crown-shaped antenna design indicated a good agreement with simulations, with an operating bandwidth of more than 240 MHz, FBR of 15.73 dB and a directional radiation pattern outward from the body.

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Gain‐enhanced antenna backed with the fractal artificial magnetic conductor

Cited by 16 publications

References 16 publications

Fractal antennas and arrays: a review and recent developments

Fractal antennas and arrays: a review and recent developments

Application of metamaterials for performance enhancement of planar antennas: A review

Gain Optimization of Low-Profile Textile Antennas Using CMA and Active Mode Subtraction Method

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