A dual band stacked aperture coupled antenna array for WLAN applications

Abstract

In this article, a dual band stacked micostrip antenna array is presented for wireless local area network. The antenna is designed and simulated using CST MWSv’14. Stacking of the patches is done to achieve dual band. Further resonant slots are cut on the patch to achieve greater bandwidth. The antenna uses aperture coupled feed with defected ground structure on reduced ground. The antenna is fabricated on FR4 substrate with a dielectric constant of 4.4. The simulated antenna shows a bandwidth of 228.3 MHz from 3.63 to 3.86 GHz and 232 MHz from 5.15 to 5.38 GHz. The simulated gain and envelope correlation coefficient was found to be 6.11 dB and 0.14. The testing of the prototype antenna (to measure S11) is done using vector network analyser. The measured results are matching to the simulated ones. The simulated and the measured results are presented in the article. © 2017 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:648–654, 2017

Breast tissue tumor detection using “S” parameter analysis with an UWB stacked aperture coupled microstrip patch antenna having a “ + ” shaped defected ground structure

“…Since all the transmission coefficients ( S ij i not equal to j ) are below a level of −15 dB, there is a low level of correlation between the three antennas that are used for tumor detection. The level of correlation is also related to the S parameters for two antennas by equation (13), this equation can be extended to three an array of three antennas also [39]. Since all three antennas excite the same UWB and the correlation between them is <0.5, the antennas in the array are not interfering with each other's radiations; therefore this set up can be easily used for the microwave imaging of the human breast.…”

A Compact Rectangular Microstrip Patch Antenna Loaded with Stubs and Defected Partial Ground Structure for UWB Systems

“…VSWR is the function of return loss and describes how well the antenna is matched to transmission line to which it is connected. The value of VSWR should be less than 2 for UWB operation [20]. The graph in fig.6 shows that the value of VSWR ranges from 1 to 2 throughout the impedance bandwidth (0.17GHz-7.25GHz).…”

“…Smith chart is defined as the polar plot of complex reflection coefficient with respect to frequency. The locus of the smith chart should intersect its center for perfect impedance matching of antenna [20]. The proposed antenna gives impedance of 50 ohms which is acceptable for practical applications.…”

Bandwidth and gain improvement for reduced size of stacked microstrip antenna fed by folded triangular patch with half V‐shaped slot

“…It is desirable to note that designing the stacked patch concludes the gain enhancement of the antenna on the operating bandwidth with respect to the structure without stacked patch. [25][26][27][28][29][30] The dimensions of the stacked rectangular patch and the position of pins can tune the resonant frequencies at the operating band. The distance of applied shorting pins from each other are 5.5 mm for maintaining the rectangular stacked patch.…”

“…24 Also, some research works have been provided in order to attain the broadband microstrip antennas by applying the stacked patches. [25][26][27][28][29][30] In Reference 25, stacked patch antennas are parasitically coupled and provide a larger bandwidth than a single patch antenna. This design provides 100% bandwidth from 23.9 to 72.2 GHz.…”