In recent years, the hybrid branch‐line coupler has attracted much attention due to its
appealing features such as of low cost and ease in fabrication for wireless communications …

We report on the design, fabrication, and measurement of a triple-band absorber enhanced
from a planar two-dimensional artificial metamaterial transmission line (TL) concept. Unlike …

This study constructs stepped-impedance-stub lines for a dual-band branch-line coupler
design with improved design flexibility. The proposed structure demonstrates dual-band …

In this paper, a rigorous design methodology is developed to design compact planar branch-
line and rat-race couplers using asymmetrical T-structures. The quarter-wave transmission …

Wide-band branch-line couplers are designed and tested. The proposed couplers feature
compact size on a single circuit layer structure without via-holes. For the broad-band …

A new method for designing the microstrip branch-line couplers with predetermined compact
size and bandwidth is proposed in this paper. With the proposed approach, the size of the …

A new class of sharp-rejection, low insertion-loss wide-band planar filters is presented in this
letter. The proposed filter topology uses transversal signal-interference filtering sections …

Branch-line and rat-race couplers are designed to have dual-band operation with arbitrary
power division ratios. An elementary two-port is proposed to imitate the 90 deg section at the …

A new type of RF microwave differential-mode planar multiband bandpass filters (BPFs) are
presented. Each symmetrical half of the proposed balanced filtering architecture is …

In this letter, a compact rat-race coupler is developed using shunt-stub-based artificial
transmission lines (SSB ATLs). A conventional quarter-wavelength microstrip can be …