Electromagnetic coupling in aperture-coupled and proximity-coupled microstrip antenna structures

2002 ◽  
Author(s):  
Lee Geun Yoon ◽  
Ji Hwan Ko ◽  
Young Ki Cho
Keyword(s):  
Microstrip Antenna ◽  
Electromagnetic Coupling

Design and development of a stacked complementary microstrip antenna with a “π”-shaped DGS for UWB, UNII, WLAN, WiMAX, and Radio Astronomy wireless applications

2017 ◽  
Vol 9 (7) ◽  
pp. 1547-1556 ◽  
Author(s):  
Amanpreet Kaur ◽  
Rajesh Khanna
Keyword(s):  
Radio Astronomy ◽  
Microstrip Antenna ◽  
Experimental Testing ◽  
Electromagnetic Coupling ◽  
Ultra Wideband ◽  
Impedance Bandwidth ◽  
Antenna Structure ◽  
Wireless Applications ◽  
Feed Line ◽  
Parasitic Patch

The proposed research paper presents the design, development, and experimental testing of a broadband stacked complementary microstrip antenna for ultra-wideband (UWB) (5.28–5.85 GHz), Unlicensed National Information Infrastructure band (UNII) (5.25–5.825 GHz), wireless local area networks (WLAN, IEEE802.11a, 5.15–5.35 GHz), and IEEE 802.11b (5.75–5.85 GHz), Worldwide Interoperability for Microwave Access band (5.25–5.85 GHz), and Radio Astronomy band (6.6–6.75 GHz) wireless applications. The main aim of this paper is to obtain an UWB behavior from the combined effect of two resonances exhibited by the driven and parasitic patches of a stacked complementary antenna geometry. Circularly polarized radiations are also emitted by the antenna by the addition of an orthogonal stub to its feed line. The proposed three-layered antenna structure (without air gap) is fabricated on commercially available glass-reinforced epoxy laminate, FR4 substrate. The topmost layer of FR4 has a square-shaped patch parasitic patch printed over it; this patch has a square slot etched out from it. The middle layer of the antenna has a square-shaped driven patch of approximately the same dimensions as that of the slot in parasitic patch. The antenna is fed using aperture-coupled feeding mechanism. Therefore the lowermost layer of FR4 has a ground plane on its top with a “π”-shaped slot etched from it and a feed line with an orthogonal stub at its bottom forming a “T”-shaped geometry. The antenna is fed by the electromagnetic coupling between the antenna layers .The proposed antenna has a compact structure with overall volumetric dimensions of 4.7 × 3.82 × 0.483 cm3. The antenna design and simulations are carried out using CSTMWSV'10 with perfect boundary (electric and magnetic) estimations. This designed antenna shows an UWB behavior from 5.14 to 5.85 GHz with an impedance bandwidth of 710 MHZ and a fractional bandwidth of 12.62% at the center frequency of band at 5.5 GHz. The radiating antenna also possesses a good gain of 4.59 dBi at the central frequency of 5.50 GHz and a 1 dB axial ratio bandwidth of 820 MHz from 5.16 to 5.98 GHz. The validation of results is done by fabrication and experimental testing of the antenna using a vector network analyzer and placing the antenna in an anechoic chamber for gain measurements. The measured results show close matching with the simulated ones and this makes the antenna well suited for the proposed wireless applications of interest, specifically in small handheld wireless communication devices.

Novel Compact Mushroom-Type EBG Structure for Electromagnetic Coupling Reduction of Microstrip Antenna array

Frequenz ◽  
2015 ◽  
Vol 69 (3-4) ◽  
Author(s):  
Lizhong Hu ◽  
Guangming Wang ◽  
Jiangang Liang ◽  
Chenxin Zhang
Keyword(s):  
Antenna Arrays ◽  
Microstrip Antenna ◽  
Mutual Coupling ◽  
Electromagnetic Coupling ◽  
Microstrip Antennas ◽  
Far Field ◽  
Electromagnetic Bandgap ◽  
Multiple Input ◽  
Microstrip Antenna Array ◽  
Field Radiation

AbstractA novel compact electromagnetic bandgap (EBG) structure consisting of two turns complementary spiral resonator (CSR) and conventional mushroom EBG (CM-EBG) structure is introduced to suppress the mutual coupling in antenna arrays for multiple-input and multiple-output (MIMO) applications. Eigenmode calculation is used to investigate the proposed CSR-loaded mushroom-type EBG (MT-EBG), which proved to exhibit bandgap property and a miniaturization of 48.9% is realized compared with the CM-EBG. By inserting the proposed EBG structure between two E-plane coupled microstrip antennas, a mutual coupling reduction of 8.13 dB has been achieved numerically and experimentally. Moreover, the EBG-loaded antenna has better far-field radiation patterns compared with the reference antenna. Thus, this novel EBG structure with advantages of compactness and high decoupling efficiency opens an avenue to new types of antennas with super performances.

Electromagnetic Coupling Reduction in Microstrip Antenna Arrays Using Single-Negative Electric Waveguided Metamaterials

2014 ◽  
Vol 596 ◽  
pp. 816-821
Author(s):  
Li Zhong Hu ◽  
Guang Ming Wang ◽  
Guo Cheng Wu
Keyword(s):  
Antenna Arrays ◽  
Microstrip Antenna ◽  
Mutual Coupling ◽  
Ring Resonator ◽  
Electromagnetic Coupling ◽  
Electric Resonance ◽  
Operating Wavelength ◽  
Novel Structure ◽  
Single Ring ◽  
Field Radiation

A single-negative electric waveguided metamaterial (WG-MTM) is proposed using folded complementary split single ring resonator (FCSSRR) to reduce mutual coupling in antenna arrays for MIMO applications. The WG-MTM is investigated numerically, which proved to exhibit electric resonance and band-gap property. Two antenna arrays have been designed, fabricated and measured. By inserting the electric negative metamaterial, a mutual coupling reduction of 9.2dB has been achieved with an edge-to-edge distance less than 0.17 (where is the operating wavelength). Moreover, the metamaterial loaded antenna has better far-field radiation patterns compared with the reference antenna. Thus, this novel structure not only has good coupling reduction ability, but also can optimize the performances of the antennas.

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