In this letter, a miniaturized hybrid dual-band branch-line coupler (BLC) with enhanced fractional bandwidths is proposed. Compact size and bandwidth enhancement are obtained using meandered transmission line sections with broken symmetry between cross-coupling branches. The circuit is designed at a low numerical cost using surrogate-assisted techniques. The optimized design features small size of only 0.25λg×0.19λg(28% miniaturization with respect to conventional single-band structure), as well as fractional bandwidths of 16% and 9% for 2.5 GHz and5.4 GHz center frequencies, respectively. The proposed structure is compared against state-of-the-art dual-band couplers and validated experimentally.
Authors
Additional information
- DOI
- Digital Object Identifier link open in new tab 10.1002/mop.31849
- Category
- Publikacja w czasopiśmie
- Type
- artykuły w czasopismach
- Language
- angielski
- Publication year
- 2019
