Ultra-Wideband Filtering 180° Hybrid Coupler With Super Wide Upper Stopband Using Swap Phase Inverter and Electromagnetic Bandgap Structures on Double-Sided Parallel-Strip Line | Zendy

Qiu-Sheng Shen | Zendy; Ming-Jian Gao | Zendy; Lin-Sheng Wu | Zendy; Xi-Lang Zhou | Zendy

Open Access

Ultra-Wideband Filtering 180° Hybrid Coupler With Super Wide Upper Stopband Using Swap Phase Inverter and Electromagnetic Bandgap Structures on Double-Sided Parallel-Strip Line

Author(s) -

Qiu-Sheng Shen,

Ming-Jian Gao,

Lin-Sheng Wu,

Xi-Lang Zhou

Publication year - 2018

Publication title -

ieee access

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.587

H-Index - 127

ISSN - 2169-3536

DOI - 10.1109/access.2018.2856837

Subject(s) - aerospace , bioengineering , communication, networking and broadcast technologies , components, circuits, devices and systems , computing and processing , engineered materials, dielectrics and plasmas , engineering profession , fields, waves and electromagnetics , general topics for engineers , geoscience , nuclear engineering , photonics and electrooptics , power, energy and industry applications , robotics and control systems , signal processing and analysis , transportation

In this paper, a multifunctional 180° hybrid coupler is proposed, with an ultra-wideband filtering response and a super wide upper stopband. The component, realized with double-sided parallel-strip line (DSPSL), is built up on the basis of a hybrid ring incorporated with a swap phase inverter and then extended with commensurate-line networks at its four ports. The quasi-lowpass electromagnetic bandgap (EBG) structures are embedded into the circuit. The collaboratively designed component occupies the area of 0.92 × 0.76 λg², where λg is the guided wavelength at the central frequency. The developed prototype provides a 110% wide passband from 0.7 to 2.4 GHz with the return loss better than 11 dB for both the in- and out-of-phase output cases. The measured additional in-band insertion loss is 1.3 to 4.7 dB over the 3-dB power division, mainly due to the losses of the DSPSL swap and EBG structures. The output phase imbalance is within the range of ±4°. The rejection of over 20 dB is achieved up to 30 GHz.

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