Recently, the speed of development and application domain technology of the wireless communication have already surpassed the fixed service technology. Repeater is the critical role in the message transmission. Thus, how to minimize the number of repeaters and meanwhile serves a certain number of users with limited resource is an important issue. This paper is constructed to solve the related i...

We report a simple biogenic-route to narrow the band gap of TiO2 nanocrystals for visible light application by offering a greener method. When an electrochemically active biofilm (EAB) was challenged with a solution of Degussa-TiO2 using sodium acetate as the electron donor, greyish blue-colored TiO2 nanocrystals were obtained. A band gap study showed that the band gap of the modified TiO2 nano...

This paper presents a novel narrowband microstrip patch antenna for radar application. The proposed antenna consists of rectangular radiating patch which provides a narrowband behavior and relatively good impedance matching working in the band of 3-12 GHz. A parametric study is performed on three different antenna structures. The measured results give three narrow band stable signal transmissio...

A dual band bandpass filter for WLAN and RFID application is presented in this paper. The proposed filter is realized using asymmetric fed intercoupled open loop resonators (OLR) with embedded E-shaped resonators with open stubs. The center frequencies of the passbands are 2. 45 GHz and 6. 8 GHz. The insertion loss at each passband is on average within 2 dB. Four transmission zeros are obtained...

This paper proposes a monopole antenna with photonic crystal structure as substrate for ultrawide band application with dual band notched characteristics.Improvements in all the main parameters of the antenna were obtained when using a PC.The measured results reveal that the presented dual band-notch monopole antenna offers a very wide bandwidth with two notched bands, covering 3.5/5.5-GHz WiMA...

This paper proposes a simple and small-dimensioned antenna that can provide X band Ku for the low-earth-orbiting (LEO) satellite system in an Internet of vehicles system. The is designed on substrate Arlon DiClad 880. structure consists inverted triangle geometry U-shaped slot. dimensions are 12.5 × 5 mm2, area 30 13 0.254 mm3. easy to make, manufacturing cost low. measurement results reflectio...

A microstrip patch antenna for WLAN application is proposed. The antenna has a frequency bandwidth of 196 MHz (5103MHz 5300 MHz). The microstrip antenna has a planar geometry and consists of a ground, a substrate, a patch and a feed. The basic theory and design are analyzed, and simulation using CST Microwave Studio commercial software is employed to optimize the antenna's properties. Results s...