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Modified window shape‐based crossover with enhanced bandwidth
Author(s) -
Zhang Shiyuan,
Sun Sheng
Publication year - 2021
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/mmce.22503
Subject(s) - wideband , bandwidth (computing) , crossover , return loss , insertion loss , stub (electronics) , microstrip , electrical impedance , optics , reflection loss , materials science , acoustics , electronic engineering , computer science , physics , engineering , telecommunications , electrical engineering , antenna (radio) , microwave , artificial intelligence
In this paper, a wideband crossover is presented based on the typical 2 × 2 distributed window‐shaped structure. By loading extra stepped‐impedance open stub at each port, three reflection zeros could be generated within the operating band for bandwidth enhancement, while three transmission zeros are introduced for isolation improvement. Two additional transmission zeros at through port are also generated to enhance the out‐of‐band attenuation. By properly adjusting the physical width and length of the stubs, a wideband response with equal reflection ripples can be achieved. As an experimental verification, a prototype of the designed microstrip crossover at 2.4 GHz is implemented and fabricated. The measured results have a good agreement with those obtained from simulation. The measured fractional bandwidth of 1 dB insertion loss achieves 38.7% and the measured 15 dB return loss bandwidth is about 39.2%, while the measured 15 dB isolation bandwidth reaches 40.0%.