Mikrodalga Görüntüleme Sistemleri için Mikroşerit Anten Tasarımı

Bu çalışmada, pek çok kanser tümörünün tespitinde kullanılmak üzere giyilebilir bir dikdörtgen mikroşerit anten tasarımı ve gerçeklemesi yapılmıştır. Mikrodalga görüntüleme sistemlerinde hem alıcı hem de verici olarak kullanılabilecek antenin yama ve toprak kısmı iletken (bakır) banttan, yalıtkan kısmı ise PF-4 (köpük) malzemeden oluşturulmuştur. CST programı kullanılarak tasarlanan antenin çalışma frekans aralığı 1.71 GHz ile 8.53 GHz arasında olup band genişliği 6.82 GHz’dir. Gerçeklenen antenin bant genişliği ise 6.75 GHz’dir (1.6 GHz- 8.35 GHz). Anten kazancı 5.31 dB gibi oldukça yüksek bir değerdir. Dar bantlı ve düşük kazançlı klasik mikroşerit antenlerden farklı olarak tasarlanan ve gerçeklenen anten ultra geniş bant gerektiren uygulamalarda rahatlıkla kullanılabilir. Ayrıca tasarlanan antenin ışıma karakteristiğinin oldukça iyi ve etrafında oluşan elektrik alan değişiminin sağlık açısından bir sorun yaratmayacak düzeyde olduğu da söylenebilir. İnsan vücudundaki organların iletkenlik değerlerinin değişiminin 1 GHz- 10 GHz frekans bandında yüksek olduğu; sağlam dokular ile tümörlü/kanserli dokuların iletkenlik değerlerinin farklı olduğu gerçeğinden yola çıkarak tasarlanan antenin akciğer, beyin, karaciğer, böbrek gibi organlarda bulunan tümörleri tespit etme için dizayn edilecek mikrodalga görüntüleme sistemlerinde kullanılabilir. Ayrıca tasarlanan antenin giyilebilir bir formda olması özellikle kanser riski yüksek olan hastaların sürekli izlemesine de olanak tanımaktadır.

Microstrip Antenna Design for Microwave Imaging Systems

In this study, design and fabrication of a rectangular microstrip antenna is made to use for the determination of many cancer tumors. The antenna can be used as both receiver and transmitter, and its patch and ground part is composed of conductor (copper) band whereas the insulator part is made of PF-4 (foam). The antenna is designed by using the computer program CST, and its operation frequency interval is between 1.71 GHz and 8.53 GHz, i.e, bandwidth is 6.82 GHz. Bandwidth of the fabricated antenna is 6.75 GHz (1.6 GHz-8.35 GHz). Antenna gain is 5.31 dB which is quite high. The antenna which is designed and fabricated in a different way from the conventional narrowband and low-power microstrip antennas can be used easily in the cases requiring ultra high band. Besides, it can be said that propagation characteristics of the designed antenna is quite good, and the electric field variation aroud it is on the level that does not pose a problem for the health. Conductivity value variations of human organs between 1 GHz- 10 GHz frequency band is high. Conductivity values of healthy tissues and tissues with tumor/cancer are different. By using these facts, the designed antenna can be used for microwave monitoring systems to be designed for determining the tumors in the organs such as lung, brain, liver and kidney. Also, since the designed antenna is wearable, it enables following the patients especially with high cancer risk continuously.

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