Slots or defects integrated on the ground plane of microwave planar circuits are referred to
as Defected Ground Structure. DGS is adopted as an emerging technique for improving the …

This paper presents an elegant yet straightforward design procedure for a compact rat-race
coupler (RRC) with an extended harmonic suppression. The coupler's conventional/4 …

Circuit designers often tend to overlook Printed Circuit Board (PCB) designs. Circuits
performance and the quality of measurements, however, are strongly correlated with careful …

A miniaturized quadrature hybrid coupler, a rat-race coupler, and a 4 * 4 Butler matrix based
on a newly proposed planar artificial transmission line are presented in this paper for …

A new compact defected ground structure (DGS) is proposed for the microstrip line. The
structure is compact in microstrip line direction. Here, this DGS is used to design a compact …

In this paper, a novel branch-line coupler using meandered line compact microstrip resonant
cell (MLCMRC) and bended lines is proposed. The presented coupler works at 0.9 GHz …

Microstrip antennas inherently have a high input impedance at resonant frequency. This
may not be convenient for some applications. For active integrated antennas, moreover, the …

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 …

In this letter, a double U-shaped defected ground structure (DGS) is proposed to broaden
impedance bandwidth of a microstrip-fed monopole antenna. The antenna structure consists …

As the same device may be used for various types of applications, antennas must have the
capacity to perform multiple functions. Reconfiguring the polarization, operational frequency …