A NOVEL DESIGN OF DUAL BAND MICROSTRIP ANTENNA FOR WIRELESS APPLICATIONS

A simple and compact inset fed dual band microstrip antenna is presented. The proposed antenna has a low profile and can easily be fed by using a 50 ohms microstripline. The proposed antenna covers all the 2.4/4.2 GHz WLAN/ RADIO ALTIMETERS operating bands, IEEE WLAN protocol 802.11 b/g employs 2.4 GHz. The antenna is simulated using An soft’s HFSSv11. Which shows good agreement with simulated results, Measured Return loss and Radiation patterns are observed to be nearly omnidirectional, moderate gain and wide frequcency band suitable for wireless applications. The antenna has an overall dimension of only 29.5mm x 38 mm x1.6mm, when printed on a FR4 substrate of dielectric constant 4.4

ULTRA WIDEBAND SLOTTED MODIFIED H-SHAPED MICROSTRIP PATCH ANTENNA FOR WIRELESS APPLICATIONS

The wireless communication system is gaining more and more progress in recent years with the support of microstrip patch antennas. Microstrip patch antennas are more comfortable for wireless devices due to their compactness, easy fabrication, and mounting. The ultra wideband slotted modified H-shaped microstrip patch antenna is presented in this article for wireless devices. Ultra wideband is achieved along with another small band makes it dual band pattern. The first band is a small band radiates at 2.95 GHz ranging from 2.68 GHz to 3.14 GHz with a bandwidth of 460 MHz. This is applicable in the wireless devices like WiMAX, IMT etc. The second band is the ultra wideband (UWB) radiates at 4.46 GHz, 8.2 GHz and 9.4 GHz ranging from 3.37 GHz to 10.1 GHz with a bandwidth of 6.73 GHz. WLAN, WiFi, WiMax and LTE can occupy this band to operate. Both the bands have maintained at VSWR<2 and the gain are kept at least -10 dB. The proposed antenna is simulated using High Frequency Structural Simulator (HFSS v15) software and fabricated on a low-cost FR4 substrate having a dielectric constant of 4.4 and height 1.6 mm with a 50-ohm microstrip line feeding. The miniaturization of the antenna is achieved with slots in the patch and ground plane, hence the name slotted patch and partial ground. The complete size of the antenna is 34x30x1.6 mm2. The simulated and experimental results are compared to conclude that both are lightly deviated

Large expert-curated database for benchmarking document similarity detection in biomedical literature search

Document recommendation systems for locating relevant literature have mostly relied on methods developed a decade ago. This is largely due to the lack of a large offline gold-standard benchmark of relevant documents that cover a variety of research fields such that newly developed literature search techniques can be compared, improved and translated into practice. To overcome this bottleneck, we have established the RElevant LIterature SearcH consortium consisting of more than 1500 scientists from 84 countries, who have collectively annotated the relevance of over 180 000 PubMed-listed articles with regard to their respective seed (input) article/s. The majority of annotations were contributed by highly experienced, original authors of the seed articles. The collected data cover 76% of all unique PubMed Medical Subject Headings descriptors. No systematic biases were observed across different experience levels, research fields or time spent on annotations. More importantly, annotations of the same document pairs contributed by different scientists were highly concordant. We further show that the three representative baseline methods used to generate recommended articles for evaluation (Okapi Best Matching 25, Term Frequency-Inverse Document Frequency and PubMed Related Articles) had similar overall performances. Additionally, we found that these methods each tend to produce distinct collections of recommended articles, suggesting that a hybrid method may be required to completely capture all relevant articles. The established database server located at https://relishdb.ict.griffith.edu.au is freely available for the downloading of annotation data and the blind testing of new methods. We expect that this benchmark will be useful for stimulating the development of new powerful techniques for title and title/abstract-based search engines for relevant articles in biomedical science. © The Author(s) 2019. Published by Oxford University Press