Dispersive delay lines using microstrip technology

A Compact Dispersive Delay Line Using Microstrip Lines and Opened Slot Lines

“…Table 1 shows the comparisons of the prototype dimensions and performance between the proposed DDL and other recently published works. It can be summarized that the proposed DDL has the smallest electric size without compromising the performance, which is only 6.2%, 10.3%, and 11.6% in area compared with the ones in [10,11] and [12], respectively. Table 1.…”

“…The third slot line is a coupling line for fine-tuning the S-parameters through adjusting the distance between the coupling line and the complementary slot lines. Compared with the conventional DDL with microstrip line technology, the length of the complementary slot line of the proposed DDL is only about λ g /4, rather than around λ g /2 in [10][11][12]. The reason for the length reduction can be explained as that the upper end is opened and the lower end shorted for the proposed complementary slot line, while both ends are shorted for the conventional complementary slot lines.…”

“…The DDL has all-pass magnitude response over ultra-wideband frequency range and provides a smooth and continuous group delay profile. In [11], the DDL theories of microstrip line technology are further developed, and analytical expressions that contain the transmission coefficient (|S 21 |) and group delay (GD) are derived. In [12], two deformed open stubs and their complementary slot lines are used to obtain a DDL with all-pass magnitude respond and good group delay.…”

“…In [12], two deformed open stubs and their complementary slot lines are used to obtain a DDL with all-pass magnitude respond and good group delay. Although there are some distinguished advantages in [10][11][12] for the DDL using microstrip line technology, the miniaturization of the DDL is crucial to the practical application, especially for operating in the low frequency band. However, both the open stubs and their complementary short slot lines in [10][11][12] are about a half guide wavelength (λ g /2) and located on both sides of the main transmission line symmetrically, which occupy a relative large space accordingly.…”

“…In this letter, we propose a novel compact DDL design that can locate the open stubs and their complementary slot lines on the same side of the main transmission line. The proposed complementary slot line has the length about λ g /4, rather than about λ g /2 in [10][11][12]. Moreover, an additional coupling slot line is embedded transversely in ground plane for fine-tuning the impedance matching.…”