Planar Diplexer Design Using an Energetic Coupling Approach

Abstract

This paper presents a simple procedure to design planar diplexers making use of an energetic coupling approach. The targeted diplexer uses a stepped impedance resonator (SIR) to generate two resonant frequencies at the desired pass bands. The energetic coupling theory is employed to obtain appropriate coupling factors between the SIR and the diplexer outputs. In order to validate the proposed design method two diplexers satisfying the GSM and WLAN application frequencies have been fabricated and characterized. One prototype has been implemented in microstrip technology, while for the fabrication of the other one a low-cost 3D printing multilayer process has been used. In both cases measurements are in good agreement with simulated responses.

KEYWORDS:

• Additive manufacturing
• Coupling factor
• Diplexer
• Energetic coupling
• Planar-technology
• 3-D printing

Additional information

Notes on contributors

Héctor García-Martínez

Héctor García-Martínez was born in Albatera, Spain. He received the master's degree in telecommunication engineering from the University Miguel Hernández of Elche, Elche, Spain, in 2016. He was a visiting scholar with the University of Pavia, Pavia, Italy, in 2019. He is currently an associate professor at the Department of Materials Science, Optics and Electronic Technology, and a researcher of Radiofrequency System Group, University Miguel Hernandez of Elche. His research interests include the design of passive and active microwave circuits in complex structures through 3D additive manufacturing techniques and the analysis of biological materials using microwave devices.

David Ramírez-Gil

David Ramírez-Gil finished his master's degree studies in telecommunication engineering at Miguel Hernández University of Elche, Spain, in 2018. Currently, he works at Indra Sistemas S A as RF engineer, as well as he collaborates as a researcher at the Department of Communications Engineering at UMH. Email: [email protected]

Germán Torregrosa-Penalva

Germán Torregrosa-Penalva is a PhD in telecommunications engineering (2004) and associate professor in the Department of Communications Engineering at Miguel Hernández University of Elche (2009). His research focuses on the modelling of active microwave devices, the study of discharge effects in guided media, the design of passive microwave circuits, microwave photonic detection techniques, and the design and manufacture of high frequency circuits through 3D additive techniques. Email: [email protected]

Ernesto Ávila-Navarro

Ernesto Ávila-Navarro received the MSc degree in telecommunication engineering from the Polytechnic University of Valencia, Spain-1998, and the PhD degree from the Miguel Hernández University of Elche, Spain-2008, for a work on planar antennas for specific personal wireless applications. In 2000, he joined the University Miguel Hernández of Elche, where he is an associate professor with the Department of Materials Science, Optics and Electronic Technology. Nowadays, he is vice-dean of the High Polytechnic School of Engineering of Elche. His current research interest includes printed antennas, passive and active microwave devices, bioelectronics and microwave imaging systems for tumour detection. Email: [email protected]

Enrique Bronchalo

Enrique Bronchalo was born in Guadalajara (Spain). He received the physics degree from the Universidad Complutense de Madrid in 1986, and the PhD in physics from the Universidad de Alcalá in 1996. In 2001, he joined the Signal Theory and Communications Division at the Universidad Miguel Hernández, (Elche, Spain), where he occupies an associate professor position. His current research is focused on passive microwave devices and microwave sensors. Email: [email protected]

Carolina Blanco-Angulo

Carolina Blanco-Angulo received the master's degree in telecommunication engineering from Miguel Hernández University of Elche, Spain, in 2020. Since 2018 she is a researcher at the Department of Materials Science, Optics and Electronic Technology. Her current research interest includes passive and active microwave devices and microwave imaging systems for tumour detection. Email: [email protected]