The introduction of new technology in the wireless communication industry increases the
number of frequency bands in the communication environment. Therefore, a communication …

Substrate-integrated waveguide (SIW) filtering crossovers featuring wide-stopband
characteristics and flexibly allocated center frequencies (CFs) and bandwidths (BWs) for two …

In this paper, a novel 4× 4 Butler matrix with wide bandwidth and compact size is presented.
The existing coupled-line-based quadrature coupler cannot be used to construct a Butler …

In this article, the design of miniature dual-band quadrature coupler that is capable of
achieving arbitrary power division ratios over the two bands is presented. By employing the …

This article presents multisection branch line couplers as dual‐band crossovers using
coupled lines (CLs) for wide bandwidth (BW) applications. The efficiency of the CL as a dual …

This paper presents a novel compact planar filtering crossover with two paths operating at
different frequencies. Such codesign circuit is equal to one conventional crossover plus two …

This brief presents, for the first time, the analysis and implementation of a dual-band coupled-
line trans-directional (CL-TRD) coupler. It is realized by cascading three periodically …

This paper presents the design of wideband and ultrawideband 90° phase shifters using
coupled-line sections and low-pass/bandpass/high-pass networks with inductors and …

A novel dual band branch line coupler (BLC) has been proposed, designed, implemented,
and analyzed in this paper. A dual band 4 *4 Butler matrix (BM) has also been developed by …

This letter presents a novel design approach for implementation of miniaturized quad-band
branch-line crossover. To achieve quad-band operation, each 90° microstrip-line of a single …