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Single section, octave bandwidth, high‐power combiner in the UHF band
Author(s) -
Naeimi Tohid,
Ahmadi Arash
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.22498
Subject(s) - resistor , ultra high frequency , broadband , bandwidth (computing) , electrical engineering , octave (electronics) , wilkinson power divider , return loss , power dividers and directional couplers , electronic engineering , engineering , computer science , telecommunications , acoustics , physics , frequency divider , voltage , antenna (radio)
In this work, a planar broadband high‐power combiner in the ultra‐high‐frequency band (UHF) is presented. The proposed broadband combiner is a modified version of the conventional Wilkinson power combiner. The isolation resistor of 100 Ω in the conventional Wilkinson combiner is replaced by two 50 Ω terminating resistors. Two overlay couplers transform the terminating resistors to a floating resistor between the input branches. Terminating resistors are preferred to a floating resistor because of higher power handling and lower parasitics. Even‐ and odd‐mode method is employed for the analysis. The design goal is 20 dB isolation and ports return loss in an octave bandwidth. To verify the design concept, a high‐power combiner in the frequency range of 470 to 860 MHz used for digital video broadcasting‐terrestrial (DVB‐T) applications is designed and constructed. Full‐wave simulations are compared with measurements. The fabricated power combiner handles 400 W output power. Analytical formulations presented in this work are not restricted to UHF band and can be used to design an octave bandwidth combiner in other frequency bands.