A novel high-performance diplexer for mobile communication base stations

Abstract

In this paper, a novel design of a diplexer for mobile communication base station is proposed, theoretically investigated and successfully tested. The proposed design of the diplexer is implemented on the base of interdigital filters. Successfully fabricated and tested diplexer operates within frequency bands 2.3–2.4/2.49–2.69 GHz and shows high performances: reflection loss within pass bands is less −20 dB, insertion loss is −0.15 dB, isolation is −30 dB and intermodulation is −124 dBm.

Computer-aided design of the diplexer is carried out on the basis of combined technique, which includes filter synthesis using coupling matrices, eigenvalue problem solution for single resonator, interresonator coupling calculation and final full wave simulation and optimization of diplexer. The suggested design is a promising candidate for the implementation of diplexers with narrow, moderate and wide bandwidths for standard mobile communication frequency bands.

KEYWORDS:

• Diplexer
• interdigital filter
• base station antennas
• mobile communications
• circuit theory synthesis

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Notes on contributors

Konstantin Kobrin

Konstantin V. Kobrin received the M.S. and PhD degrees from Rostov State University (since 2006 Southern Federal University), Russia, in 1991 and 2004, respectively, both in radiophysics. In 2014 he joined the Physics Department of Southern Federal University, where he is currently Associate Professor. His research interests are in the areas of computer-aided design of antennas, antenna arrays, microwave and millimeter-wave components.

Vyacheslav Rudakov

Vyacheslav A. Rudakov received the B.S. and M.S. degrees from Southern Federal University, Russia, in 2008 and 2010, respectively, both in radiophysics. In 2010 he joined the Physics Department of Southern Federal University as Research Engineer. Since 2019 he has been Research Engineer of Guandong Sigtenna Communication Technology Co., Ltd. His research interests are in the areas of base station antennas, antenna arrays and passive microwave components.

Zimeng Li

Zimeng Li is Director of Guandong Sigtenna Communication Technology Co., Ltd. His research interests are in the areas of base station antennas, antenna arrays and passive microwave components.

Mikhail Manuilov

Mikhail B. Manuilov received the M.S., PhD and Dr. Sc. degrees from Rostov State University (since 2006 Southern Federal University), Russia, in 1982, 1988 and 2007, respectively, all in radiophysics. From 1982 to 1985 he was Research Engineer in Institute of Radiocommunications at Rostov-on-Don. In 1985 he joined the Physics Department of Southern Federal University, where he is currently Full Professor and Head of Department. His research interests are in the areas of the computational electromagnetics and computer-aided design of antennas, phased antenna arrays, microwave and millimeter-wave components.