Abstract
The aim of the study is to practically implement the Defected Ground Structure (DGS) based microstrip bandpass filter in an energy harvester circuit. DGS is widely used to bring about an enhancement in the characteristics of microwave circuits. The study of DGS is derived from the concept of Photonic/electromagnetic Band Gap (PBG) structures but it is easier to design and fabricate and has an easier equivalent LC resonator circuit. In this study, DGS has been reviewed from all aspects such as comparing it with PBG, discussing in detail its unit, its structure and property according to various shapes and designs and its several advantages in microstrip filters. Although DGS has various advantages in the area of microwave power amplifier, Wilkinson power divider, microwave antennas, couplers, etc., it is extensively used in the design of microwave filter to achieve stopband effects, slow-wave effects, frequency adjustment etc. Finally a DGS based bandpass filter working at 900 MHz has been designed, fabricated and tested for implementation in an Energy Harvester circuit.
Highlights
Microwave components are used in spacecraft, satellite, aircraft and missiles where different parameters such as size, weight, cost, performance parameters and easiness in installation are constraints
As far as simulations is concerned the location of transmission zeros are a zero at DC, the passband is further bounded by two finite transmissionzero at frequency f1 = 0.52 GHz and f2 = 1.8 GHz
The degradation between the measured and simulated result is due to fabrication error and resonator and Defected Ground Structure (DGS) alignment error
Summary
Microwave components are used in spacecraft, satellite, aircraft and missiles where different parameters such as size, weight, cost, performance parameters and easiness in installation are constraints. Two different types of structures are used to achieve miniaturization and better performance in microwave circuits, namely, Defected Ground Structure (DGS) and the Electromagnetic/Photonic Band Gap (EBG/PBG) (Yang and Rahmat-Samii, 2009). DGS is an intentionally produced defect in ground plane of a transmission line. It can be a periodic or a non periodic configuration depending on the requirement. The effect of defect on a transmission line is that it disturbs the current distribution in the ground plane. It changes the effective capacitance and inductance of the transmission line. Effective capacitance and inductance can be altered by producing a specified defected shape in the ground plane of the microstrip (Weng et al, 2008)
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