Radiation Gain Of Antenna Research Articles

Investigation of gain effect of multi-band patch antenna based on composite rectangular SRRs

The paper focus on describing the important influence and physical law of the Split_Resonant_Rings (SRRs) based on Left Handed Material (LHM) on patch antennas. The FDTD method, together with FEM method is used to study the characteristics of patch antenna based on composite rectangular SRRs. A novel composite rectangular SRR system is formed by assembling the conventional patch antenna and SRRs, it is found that electromagnetic wave resonance occurs at several bands: GSM (880–960MHz), DCS (1710–1881MHz), and PCS (1850–1990MHz). The electromagnetic wave's “tunnel effect” and evanescent waves’ enhancing effect are formed, which can improve the localization extent of electromagnetic wave's energy apparently, such effects can improve the antenna's radiation gain and its matching condition. The phenomenon indicates that such composite rectangular patch antennas are promising in wireless communications such as mobile phone, satellite communication and aviation.

Study on left-handed effect of composite helices and its application in square frame patch antennas

The finite difference time domain (FDTD) method is used to study the characteristics of composite helices patch antenna based on left-handed effect. The numerical results indicate that electromagnetic wave resonance occurs near f=4.18GHz where the equivalent permittivity and permeability are both negative. In this case, the electromagnetic wave's tunneling effect and evanescent waves’ enhancing effect are formed. Such effects can improve the antenna's radiation gain and its matching condition, and this composite patch antennas’ return loss is much lower compared to conventional antenna. Due to these advantages, the use of composite square frame patch antennas will be extended to mobile communication, satellite communication, aviation, etc.

Left-Handed Effect of Composite Rectangular SRRs and Its Application in Patch Antennae

We concentrate on describing the important influence and physical law of the split resonant ring (SRR) based left-handed materials on patch antennae. The finite-difference time-domain method, together with the finite element method is used to study the characteristics of patch antennae based on composite rectangular SRRs. A novel composite rectangular SRR system is formed by assembling the conventional patch antennae and SRRs, it is found that electromagnetic wave resonance occurs near f = 3.15 GHz, the equivalent permittivity and permeability are both negative, and the electromagnetic wave's tunnel effect and evanescent waves' enhancing effect are formed, which can improve the localization extent of electromagnetic wave's energy apparently. Such effects can improve the antenna's radiation gain and its matching condition. The phenomenon indicates that such composite rectangular patch antennae are promising in wireless communications such as mobile phones, satellite communication and aviation.

Planar inverted F antenna loaded with high permittivitymaterial

Enhanced gain of an inverted F antenna loaded with a very high permittivity substrate has been demonstrated. Measurements show that the size of the antenna can be reduced without sacrificing the antenna radiation efficiency. The gain-enhancement mechanism, bandwidth, and antenna radiation gain and patterns are presented and discussed.