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2 2021

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Design of a high directive sensor for microwave imaging application

Abdullah Nuruliswa, Abd Aziz Mohamad Zoinol Abidin, Shukur Jaafar Abd

Przegląd Elektrotechniczny

2021

R. 97, nr 10

8--11

This paper presents a compact uniplanar Vivaldi antenna sensor for microwave imaging. It is ideal for microwave imaging systems with its large bandwidth and end-fire radiation performance. The Vivaldi patches integrate a coplanar waveguide (CPW) feed line, ensuring the entire structure is compact and simple. Reflection coefficient, radiation pattern, gain, efficiency, and directivity were the antenna parameters analyzed to determine the Vivaldi antenna's performance. The bandwidth of the antenna sensor is wider, approximately 5 GHz (3-8 GHz). The gain of the antenna is 6.72 dBi, and the directivity is 9.59 dBi.

W artykule przedstawiono kompaktowy jednopłaszczyznowy czujnik antenowy Vivaldiego do obrazowania mikrofalowego. Jest idealny do systemów obrazowania mikrofalowego dzięki dużej szerokości pasma i wydajności promieniowania końcowego. Łaty Vivaldi integrują współpłaszczyznową linię zasilającą falowodu (CPW), zapewniając, że cała konstrukcja jest zwarta i prosta. Współczynnik odbicia, charakterystyka promieniowania, wzmocnienie, wydajność i kierunkowość były parametrami anteny analizowanymi w celu określenia wydajności anteny Vivaldi. Szerokość pasma czujnika anteny jest szersza, około 5 GHz (3-8 GHz). Zysk anteny wynosi 6,72 dBi, a kierunkowość 9,59 dBi.

A novel type of wearable dual-band antenna based on coplanar waveguide feeding for wearable wireless communications

He Zhengrui, Jin Jie

Optica Applicata

2021

Vol. 51, nr 2

159--170

A flexible and compact coplanar waveguide feed (CPW-fed) wearable antenna is introduced for wireless wearable communications applications at the industrial scientific medical (ISM) band. The proposed antenna consists of copper, which is used as the radiation patch and ground planes printed on the same side of polyimide flexible substrate. The overall size of the antenna is 30 mm × 28 mm × 0.08 mm, the results show that the antenna can transmit and receive signals in two frequency bands of 1.89–2.67 GHz and 3.02–3.23 GHz, in which radiating properties are characterized and agree well with the simulation results. The antenna is bent in different directions to further investigate the reflection coefficient and corresponding effect on the antenna under bending. The center frequency of the antenna is slightly shifted towards higher and lower frequencies when antenna is bent in X-axis and Y-axis, respectively. Furthermore, the wearability of the antenna is verified when the antenna is placed on different parts of the human body such as wrist and chest. Hence, the proposed flexible antenna is a suitable candidate for wearable wireless communication applications.