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Khattak, Muhammad Kamran,Kahng, S. Informa UK (TaylorFrancis) 2016 Journal of electromagnetic waves and applications Vol.30 No.12
<P>This paper presents a new dipole antenna that has robust input impedance matching and electromagnetic radiation, and low SAR for human body contact. It is made possible by backing the main radiator with a thin and small-area artificial magnetic conductor (AMC). Different from the conventional AMC which occupies a multi-layered large area based on the full PEC ground for a high antenna directivity, the proposed structure works for 2.4-GHz-ISM band, and has a 1-mm thickness and a 50mm-by-50mm footprint with good impedance matching and radiation performances even near human tissue, and a low SAR below 1.6W/kg is obtained. This design method is validated by full-wave simulations and physical implementation.</P>
Design of a UHF wide-band antenna with a compact notch filter
Khattak, Muhammad Kamran,Kahng, Sungtek IET 2016 IET microwaves, antennas & propagation Vol.10 No.15
<P>A novel ultra high frequency (UHF) broadband polygonal monopole antenna with a notch is presented. The antenna is a wineglass-shaped geometry near two pairs of long-horn-shaped coupling elements located on the top and bottom surfaces to cover the band of 700 MHz-1.3 GHz with the size of 150 x 100 x 1.2 mm. The notch filtering is achieved at 900 MHz by using the open-terminated stub of a novel composite right/left handed transmission-line phase shifter. The phase shifter is 12 mm as 0.07 x (g). The validity of the proposed scheme is verified by designing and comparing the wide-band antenna with different notch-making approaches through electromagnetic simulation, fabrication and measurement. The simulated and measured results show high degrees of agreement. The suggested antenna is shown to be useful for UHF-band applications with a stopband at 900 MHz to avoid potential interference from the GSM-E service, Z-wave communication and UHF radio-frequency identification tag frequencies.</P>
Risk Factors Associated with Thyroid Carcinoma in North Pakistan
Khan, Muhammad Aleem,Khan, Kamran Hakeem,Shah, Sajid Ali,Mir, Kahkashan Ali,Khattak, Mubarik,Shahzad, Muhammad Faheem Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.1
Background: Epidemiological data on thyroid cancer and associated risk factors are scarce in our setting. The present study was therefore designed to gather data which could be helpful in providing insights to thyroid physicians and surgeons for better management of affected patients. Purpose: To determine the frequency of carcinoma thyroid among patients presenting with goiter and its association with TSH, Tg/ATg and other demographic factors. Materials and Methods: A total of 73 adult patients of either gender with solitary solid cold nodules and/or multi-ndoular goiter (MNG) with predominant solid cold nodules were enrolled. All surgically resected samples were sent for histopathology. The frequency of thyroid cancer and its subtypes was noted and tested for association with gender, age (< or ${\geq}40years$), recent increase in swelling size, TSH, Tg and ATg. Results: Thyroid cancer was diagnosed in 26% (n=19) of the patients, 14 (73.7%) being diagnosed with papillary thyroid cancer and 5 (26.3%) with follicular thyroid cancer. No other subtypes were noted. Presence of thyroid cancer was significantly associated with recent increase in swelling size and higher TSH Values mean TSH values (P<0.05). No significant association was found with gender, age, Tg and ATg values (P>0.05). Conclusions: Overall percentage of thyroid cancer in our study sample was found to be 26%, with a predominance of papillary over follicular lesions. Rates were significantly higher in patients who had history of recent increase in swelling size and higher and higher pre-surgery TSH values.