Coupled-Strip-Transmission-Line Filters and Directional Couplers

Coupled Transmission Lines as Impedance Transformer

“…The impedance matrix for the 4-port open-circuited coupled line section in Fig. 1, where transverse electromagnetic (TEM) wave propagation and symmetric transmission lines are assumed, can be expressed in terms of the even and odd mode impedances, Z0e and Z0o, and the electrical length, θ [4]:…”

Contactless Testing of Circuit Interconnects

“…In principal, direct physical probing on fragile pads will not be needed; the power supply of the unit under test as well as the diversity of the components will not continue to be problematic, either. The method is based on two broadside-coupled striplines, which are characterized in [11]. Galvanic measurement is preferred to determine the integrity of joints that connect embedded, active and passive components via an interconnect.…”

“…To analytically determine an expression that involves the impact of defects on a line under test, the model described in [11] V g which connects the port 1 and port 2 within a frequency range, we expect to get a response which is related to the quality of the interconnect and thus determine whether the connections are defective.…”

“…(1) where z3 11 = R g + z2 11 , z3 21 = z2 21 and S21 is the transmission coefficient of the full network. This network consists of the broadside-coupled striplines with its capacitive loads with ports 3 and 4 discarded; otherwise, 50 loads are connected virtually at ports 3 and 4 while processing conversions from Z to S parameters, thus resulting in a mismatch with the structure loads.…”

“…After connecting the IOs of the two bare dies, which are encapsulated by an insulator with ε r and supported by a copper ground plane, a test board consisting of a sensing line, an insulator and a ground plane mounts to the test unit. Together, the components form a broadside-coupled stripline structure [11] with termination loads. An electrical equivalent circuit of the setup is illustrated in Fig.…”