Compact broadband coaxial to rectangular waveguide transition

ABSTRACT

Coaxial to waveguide transitions play an important role in high frequency systems. The excitation signal to be employed for the calibration of high-power systems and microwave components is typically in the form of standard 50 Ω coaxial port. Therefore, it is necessary to provide a transition medium to inject the coaxial signal into the waveguide medium. This article presents a simple yet effective coaxial to waveguide transition. A cone-shaped transition including a cone-shaped impedance match section is proposed. Simulation and measurement results are presented. The insertion loss of better than 10 dB is achieved for the operating bandwidth of 2.2–4.6 GHz, which shows superior performance, considering other transition units. Moreover, the simplicity of the design and structure makes is feasible to be employed for other waveguides. The proposed broadband transition design is suitable to be employed as the feed of broadband horn antennas, as well as the TE${}_{11}$ mode launcher feed.

Keywords:

• Coaxial
• waveguide
• transition
• matching

Disclosure statement

No potential conflict of interest was reported by the authors.

ORCID

Masoud Dahmardeh http://orcid.org/0000-0003-0331-5457

Additional information

Notes on contributors

Mohsen Yousefian

Mohsen Yousefian was born in Gonabad, Iran, in December 1985. He received the MSc degree from Malek Ashtar University of Technology, Tehran, Iran in 2017. He is currently a Senior Research Fellow with the Telecommunication Engineering Research Institute & Microwave Laboratory, Tehran, Iran. His research interests are antenna design, microwave components such as adapters & mode converters, transmission lines, microwave tubes and microwave radiation measurements.

Seyed Jalil Hosseini

Seyed Jalil Hosseini received the MS degree in 2016 in Electrical Engineering from Khajeh Nasir Toosi University of Technology, Tehran, Iran. He is currently studying for a PhD with major in communication systems at the Electrical Engineering Department, Iran University of Science and Technology, Tehran, Iran. His research interests are antenna design, mode converters, waveguide design, electromagnetic field measurement instrumentation, and radiation system design.

Masoud Dahmardeh

Masoud Dahmardeh received the BS and MS degrees in Electrical Engineering from AmirKabir University of Technology, Tehran, Iran, in 2006 and 2009, respectively. In 2009, he joined The University of British Columbia (UBC), Vancouver, Canada, to pursuit his higher education. He received his PhD degree in 2014 with major in micro-electro-mechanical systems (MEMS). He is currently a Faculty Member and Assistant Professor at The School of Automotive Engineering, Iran University of Science and Technology, Tehran, Iran. His research interests are active integrated antennas, radiation, microfabrication, microelectro-mechanical systems, carbon nanotubes (CNT), shape memory alloys (SMA), and photonic crystals.