Özet:

In this study, a new compact wideband lowpass filter was introduced. The proposed filter is developed by cascading two shapes of ‘4’ open stubs back to back embedded on a microstrip line. This structure results in wide cutoff frequency and rejection band with improved scattering parameters.  The filter utilized operating bands up to 4 GHz. Many useful wireless communication bands were allocated within this band, global system for mobile communications (GSM) bands (1.8, 1.9 and 2.1 GHz) and 2.4 GHz which is used for industrial, scientific and medical (ISM) band and wireless local area networks (WLANs) applications.The designed filter also covers the band 3.5 GHz widely used for worldwide interoperability for microwave access (WiMAX) applications. The frequency response of the filter shows good stopband characteristic and provides -3 dB cutoff frequency at 3.85 GHz. The return loss of the designed filter is -50.8 dB at 3GHz and the insertion loss is less than -0.18 dB along the passband. The proposed filter has been designed, analyzed, and optimized on a substrate with 10.8 dielectric constant and thickness of 1.27 mm using full wave Electromagnetic Simulator. The proposed filter is a compact size and the final optimized dimension of the simulated filter with the above features is only 20 mm ×15mm.

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