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The IUP Journal of Electrical and Electronics Engineering:
Photonic Band Gap Structure for Microwave Applications.
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A new Photonic Band Gap (PBG) unit cell is proposed to improve the value of effective components like inductance and capacitance. It makes it easy to control the cutoff frequency by increasing the effective parameters. The proposed periodic PBG structure provides excellent cutoff and stopband characteristics at different center frequencies. PBG structure shows improved effective inductance using six cells structure, was fabricated with identical periodic and different dimensions. Measurements analyzed on the different fabricated PBG circuits show that the cutoff and stopband center frequency characteristics depend on the physical dimension of the proposed PBG unit cell.

 
 

The Photonic Band Gap (PBG) research was done in the optical fields originally, but the PBG structures can be applied to wide frequency ranges including the microwave frequency band by properly scaled dimension. Recently, there has been an increasing interest in microwave and millimeter-wave applications of PBG (Fei et al., 1999; and Shao and Yee, 2005). Typically, a PBG structure is made up of two or three dimensional periodic metallic structures. When designed properly, it acts like a band reject filter, which means filter reflecting certain frequency and transmitting rest of frequencies in RF fields (Fu et al., 2001; and Han et al., 2005). A PBG structure, which has a period, has been known for providing rejection of certain frequency bands, i.e., band gap or stopband effect (Nesic, 2002; and Min et al., 2009). There are too many designing parameters, which have an effect on the band gap properties, such as the number of cells, cell shapes, cells spacing, different dielectric materials and relative volume fraction. In this paper, the etched shape is proposed as a PBG unit cell, which provides the band gap or stopband with different frequencies, and keeping ground surface plane as perfect electric conductor.

The proposed PBG unit cell provides the cutoff frequency characteristics due to effective inductance. By changing the physical dimensions of the etched lattice, the effective inductance of PBG cells can be easily controlled. Furthermore, the proposed PBG unit cell is simulated with different dimensions in order to show the variation of the effective parameters. Six PBG circuits have been implemented, which consist of five unit cells with different physical dimensions and identical periods. All results are compared with the measured data which have an impact on the PBG shapes, PBG spacing, pole attenuation and central frequency. The PBG structure has a number of agreeable features such as insertion loss is very low, small capacitive and inductive values, structure is very easy to design and stopband is deeper.

 
 
 

Electrical and Electronics Engineering Journal, Photonic Band Gap (PBG) cell, Cutoff frequencies, Computer Simulation Technology (CST) software, Effective inductance and capacitance, Lattice dimension