BMA	Bunching metamaterial antenna
BCA	Broadband circular array
FDBM	Frequency-diverse bunching metalens
HFSS	High Frequency Structure Simulator
FEM	Finite element method
ROI	Region of interest
SNR	Signal-to-noise ratio
GZCD	Gradient zoom coefficient design
VNA	Vector network analyzer
SOLT	Short-open-load-thru
FISTA	Fast iterative shrinkage threshold algorithm
CGLSA	Conjugate gradient least squares algorithm
MMA	Metamaterial aperture antenna