Wideband 18–40 GHz Surface Micromachined Branchline Quadrature Hybrid

Author

Sutton, Nathan A. ; Oliver, J. Marcus ; Filipovic, Dejan S.

Author_Institution

Electr., Comput., & Energy-Eng. Dept., Univ. of Colorado, Boulder, CO, USA

Volume

22

Issue

9

fYear

2012

Firstpage

462

Lastpage

464

Abstract

This letter demonstrates two 18-40 GHz rectangular coaxial branchline quadrature hybrids designed using circuit and full-wave simulations. The chosen topologies are fabricated in a surface micromachining technology PolyStrata. Measured in-band performance of baseline wideband branchline hybrid shows |S₁₁|<;-10dB, |S₂₁| = -4.1 ± 1dB, and |S₃₁| = -4.3 ± 0.7 dB. This hybrid is miniaturized by meandering the rectangular coaxial lines to obtain 57% reduction in surface area and in-band performance with |S₁₁| <; -10dB, |S₂₁|= -4.2±1.2dB, and |S₃₁| = -4.1 ± 0.7 dB.

Keywords

coaxial cables; coupled transmission lines; micromachining; PolyStrata surface micromachining technology; baseline wideband branchline hybrid; circuit simulations; coupled line hybrid; frequency 18 GHz to 40 GHz; full-wave simulations; rectangular coaxial branchline quadrature hybrids; wideband surface micromachined branchline quadrature hybrid; Couplers; Performance evaluation; Surface impedance; Topology; Transmission line measurements; Wideband; Coax line; micromachining; quadrature hybrid;

fLanguage

English

Journal_Title

Microwave and Wireless Components Letters, IEEE

Publisher

ieee

ISSN

1531-1309

Type

jour

DOI

10.1109/LMWC.2012.2210865

Filename

6263252