A miniaturized 3 dB branch-Line hybrid coupler with harmonics suppression
Journal
IEEE Microwave and Wireless Components Letters
Journal Volume
21
Journal Issue
10
Pages
537-539
Date Issued
2011
Author(s)
Abstract
This letter presents a miniaturized 3 dB branch-line hybrid coupler with second harmonic suppression using high-impedance transmission lines and interdigitated shunt capacitors. By using the interdigitated capacitors shunt with the transmission lines, further minimization of the 3 dB branch-line hybrid coupler can be achieved compared with previously reported techniques. The design of the interdigitated shunt capacitors requires concurrent optimization of the capacitance to the ground and the edge-coupling interdigitated capacitance between the ports. For validation, a miniaturized 3 dB branch-line hybrid coupler at 836.5 MHz was designed and implemented. The proposed 3 dB branch-line hybrid coupler achieved a compact size of 27.75 mm �� 25.7 mm, or equivalently 0.077�f o ��0.072�f o , where �f o is the free-space wavelength. Moreover, the coupler can suppress second harmonic components by 20 dB while maintaining similar measured performance compared to the conventional branch-line hybrid coupler.
SDGs
Type
journal article