Design, Simulation and Manufacturing Microstrip Low-pass Filter by Wide Stopband and Changing Fast Situation from Passing State to Stopping

ABSTRACT

In this paper, a new microstrip low-pass filter will be presented for achieving high ability to choose wide stopband and suitable operation. This filter is built after design and simulation, and results of measurement will confirm the design accuracy. The results show that the overall performance of the recommended structure is improved in terms of physical dimensions, sharpness of response, and width of stopband, compared to old structures. Cut-off frequency of filter is 1.1 GHz. The stopband is so wide, and the amount of weakness in this band is equal to −20 dB. Roll-off rate parameter of the proposed filter is equal to 240 dB/GHz. This means that changing filter condition moves rapidly from passing to stop state. Size of proposed filter is small and equal to 27 mm × 16 mm. Results of simulation and measurement of the fabricated sample exhibit the same reaction.

KEYWORDS:

• Low-pass filter
• Micro-strip technology
• Scattering parameters
• Stepped impedance resonator
• Wide stopband

DISCLOSURE STATEMENT

No potential conflict of interest was reported by the authors.

Additional information

Notes on contributors

Ali Salehi

Ali Salehi has received the BSc degree in electronic engineering from Shiraz University, Shiraz, Iran in 1997. At present, he is pursuing MSc degree in electronic engineering at Islamic Azad University of Arak. His research focus is in area of simulation of high frequency filters. Besides studying, he works at the thermal power plant as I&C engineer.

E-mail: [email protected]

Gholamhosein Moloudian

Gholamhosein Moloudian was born in Kazerun, Iran in 1988. He received the associate's degree in electronics from Technical and Vocational College of Yasouj (Yasouj, Iran in 2008), the BSc in electronics from Higher Education Center of Shiraz (Shiraz, Iran in 2010), the MSc in electronics from Islamic Azad University of Bushehr (Bushehr, Iran in 2012), and the PhD in electrical engineering (electronics) from Islamic Azad University of Arak (Arak, Iran in January 2018). His research interests include design and analysis of Microwave/RF circuits, RF MEMS, Neuro-fuzzy algorithms, Tunable Optical and microstrip devices (filter, diplexer, and antenna).

Farbod Setoudeh

Farbod Setoudeh is currently an assistant professor of electrical engineering with the Department of Electrical and Computer Engineering, Arak University of Technology, Arak, Iran. He received BSc degree in electrical engineering, and MSc degree in electronic engineering in 2006, and 2008, respectively and PhD degree in electrical engineering (electronic) from Science and Research Branch, Islamic Azad University, Tehran, Iran in 2014. His research interests are linear and nonlinear control system and systems identification, neural network, modeling, stability, circuits design, earthquake prediction, and filter design.

E-mail: [email protected]