Compact CPW-fed Slot Antenna Research Articles

A compact CPW-fed wideband slot antenna with reflector for wireless communication

ABSTRACTA compact CPW-fed slot antenna is proposed here. The antenna has a pentagonal patch nested within an asymmetrical slot along with a coplanar waveguide feed. The suggested antenna also has a circular polarization over a wide range. For achieving better performance and to increase the gain of the antenna a single aluminum reflector is used. Results with reflectors of different materials are studied and simulated. The reflector helped to achieve a higher gain, stable radiation pattern, and a good impedance match. The antenna covers an impedance bandwidth of 10.5 GHz and an axial ratio bandwidth of 1.3 GHz allied with a fractional bandwidth of 118%. The simulated result complies with the bandwidth requirements of IEEE 802.11a (5.15–5.35 GHz/5.47–5.725 GHz) for wireless applications.

Efficient design of electrically small antenna using metamaterials for wireless applications

In this paper, a simple and efficient approach is presented for the design of a compact CPW fed slot antenna loaded with complementary split ring resonators (CSRRs) and metamaterial (MTM) slab. It has been shown that the fundamental resonant frequency of the conventional slot antenna can be lowered considerably by loading CSRRs and an MTM slab. The MTM slab consists of an array of 1 × 3 single-sided periodic structure of split ring resonator unit cells. The CSRRs are incorporated on both sides of the rectangular slot and the MTM slab is placed below the dielectric substrate of the antenna to achieve miniaturization. About 56.7% miniaturization is attained for the proposed CSRRs and MTM slab loaded antenna in comparison to the conventional antenna. It is also observed that the minimal effect on the co-polarization and cross-polarization is obtained in the case of proposed antenna. The overall antenna size is 0.23 λ0 × 0.23 λ0 × 0.009 λ0, where λ0 is the free space wavelength. In this proposed antenna a high radiation efficiency of about 84.2% is obtained. Owing to the high efficiency and compact size, the proposed antenna will find broad applications in the field of wireless communication.

WLAN 시스템용 이중 대역 CPW 소형 슬롯 안테나

In this paper, the compact CPW-fed slot antenna for WLAN applications is proposed. While the proposed antenna with size of only 20 × 18 × 1 mm 3 is consisted of double stub and folded slot, the antenna for 2.4 GHz band and 5 GHz band is designed and fabricated with optimized parameters obtained by simulation. Proposed antenna is fabricated with FR-4 substrate to the thickness of 1.0 mm. By obtaining the measured return loss level of < -10 dB at dual-band, we showed that it is operated as antenna for WLAN applications, and then it is also expected to be usable as antenna for RFID.

분할 링 공진기를 이용한 소형 CPW급전 슬롯 안테나 설계

ABSTRACT In this paper, a design method for a compact CPW-fed slot antenna using SRRs is studied. The structure of the proposed slot antenna is a rectangular slot antenna loaded with SRR conductors inside the slot to reduce the antenna size. Optimal design parameters are obtained by analyzing the effects of the gap between the SRR conductors and slot, and the width of the SRR conductors on the input VSWR characteristic. The optimized compact slot antenna operating at 2.45 GHz band is fabricated on an FR4 substrate with a dimension of 36 mm by 30 mm. The length of the proposed compact slot antenna is reduced to 14.3% compared to that of a conventional rectangular slot antenna. Experiment results show that the antenna has a desired impedance characteristic with a frequency band of 2.4—2.49 GHz for a VSWR < 2, and measured gain of 2.3 dBi at 2.45 GHz. 키워드 : 슬롯 안테나, 소형 안테나, 분할 링 공진기(SRR), CPW급전, 용량성 Key word : slot antenna, compact antenna, split-ring resonator(SRR), CPW-fed, capacitiveJournal of the Korea Institute of Information andCommunication Engineering

DESIGN AND VALIDATION OF ASYMMETRICALLY SLOTTED ULTRA WIDE BAND ANTENNA FOR WIRELESS COMMUNICATION

A new compact CPW-fed slot antenna for UWB applications is presented in this paper. The slot in the ground plane is asymmetric which helps in wide band impedance matching. The radiating element is a star-shaped geometry fed by a double stepped co-planar waveguide. Three antennas are designed with this geometry. Out of these three antennas, a compact antenna is proposed. The size of the proposed antenna is 27:2 £ 32:2mm 2 , and it has a measured impedance bandwidth of 8.7GHz (3{11.7GHz). The radiation patterns are stable with respect to frequency and of bi-directional shape in E-plane and omnidirectional shape in H-plane. The measured and simulated results are in good agreement.

Cpw-fed slot antenna for mimo system applications

A compact CPW-fed slot antenna is proposed for wireless local area networks (WLAN) applications in IEEE 802.11b/g/a systems. The measured results of the fabricated antenna show that the impedance bandwidths are 600 MHz from 2.1 to 2.7 GHz and 1500 MHz from 4.8 to 6.3 GHz, which cover all the desired operating bands. A multi-feed 4-element planar array was designed and simulated. It shows that the features of small size, uniplanar structure, good radiation characteristics, and small mutual coupling are promising for multi-input multi-output (MIMO) applications.

A Compact Quadband CPW-Fed Slot Antenna for M-WiMAX/WLAN Applications

A novel compact CPW-fed slot antenna for quadband operation is proposed. The antenna is printed on a 25 × 20 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> FR4 substrate with thickness of 1.6 mm and relative permittivity of 4.6. Three L-shaped slots and a rectangular slot are fabricated on the substrate to achieve quadband operation of 2.07-2.77, 3.3-3.8, 5.15-5.35, and 5.7-5.89 GHz. As the four resonant frequencies of antenna are excited by certain parts of the patch respectively, one resonant frequency can be flexibly tuned with little effect on the other. Experimental results demonstrate the good broadside radiation patterns for the four bands and suggest that the proposed antenna is suitable for the M-WiMAX and WLAN applications.

A compact CPW fed slot antenna for ultra wide band applications

A printed compact coplanar waveguide fed triangular slot antenna for ultra wide band (UWB) communication systems is presented. The antenna comprises of a triangular slot loaded ground plane with a T shaped strip radiator to enhance the bandwidth and radiation. This compact antenna has a dimension of 26 mm × 26 mm when printed on a substrate of dielectric constant 4.4 and thickness 1.6 mm. Design equations are implemented and validated for different substrates. The pulse distortion is insignificant and is verified by the measured antenna performance with high signal fidelity and virtually steady group delay. The simulation and experiment reveal that the proposed antenna exhibits good impedance match, stable radiation patterns and constant gain and group delay over the entire operating band.

COMPACT SLOT ANTENNA WITH EBG FEEDING LINE FOR WLAN APPLICATIONS

A compact CPW-fed slot antenna is proposed for dual- band wireless local area network (WLAN) operations. In this paper, electromagnetic band gap (EBG) structures with square-shaped lattices have been incorporated into the feed network for harmonic suppression. Experimental results show that EBG structures not only exhibit well-behaved band stop characteristics, but also enhance the bandwidth of the proposed antennas. For the proposed antenna with square-shaped lattices, the i10dB return loss bandwidth could reach about 38.4% for the 2.4GHz band and 23.8% for the 5GHz band, which meet the required bandwidth speciflcation of 2.4/5GHz WLAN standard.