Abstract
In this paper, a new bandpass filter design has been presented using simple topology of stepped impedance square loop resonator. The proposed bandpass filter has been simulated and fabricated using a substrate with an insulation constant of 10.8, thickness of 1.27mm and loss tangent of 0.0023 at center frequency of 5.8 GHz. The simulation results have been evaluated using Sonnet simulator that is extensively adopted in microwave analysis and implementation. The output frequency results demonstrated that the proposed filter has high-quality frequency responses in addition to isolated second harmonic frequency. Besides, this filter has very small surface area and perceptible narrow band response features that represent the conditions of recent wireless communication systems. Various filter specifications have been compared with different magnitudes of perturbation element dimension. Furthermore, phase scattering response and current intensity distribution of the proposed filter have been discussed. The simulated and experimental results are well-matched. Lastly, the features of the proposed filter have been compared with other designed microstrip filters in the literature.
Highlights
Filtering Techniques have been employed in all fields of signal processing to handle the features of electrical signals [1,2] or organize signal transmission among specific frequency bands [3].Microstrip bandpass filters are a particular type of filters that can be used to pass a definite range of frequencies and decline another one based on their application requirements
The main objective here is to present a new filter design with compact size, better selectivity and second harmonic frequency suppression by applying Stepped Impedance Resonator (SIR) approach depicted in Fig 1 on all sides of the classical square loop resonator
New dual degenerate mode microstrip bandpass filter based on SIR approach on all sides of the square loop resonator has been presented in this paper
Summary
Microstrip bandpass filters are a particular type of filters that can be used to pass a definite range of frequencies and decline another one based on their application requirements. These filters are typically realized using one or more resonators, coupled to each other. These resonator components represent physical elements that store both electric and magnetic energy in a frequency-dependent way. High return loss, small insertion loss and big rejection band levels. These represent the features of a high-quality filter.
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