Wideband coupled resonator based ultra-wideband 3dB power divider
In this paper, a 3dB ultra-wideband (UWB) power divider has been designed using three wide-band coupled resonators. The resonator unit which consists of symmetric interdigital coupled input/output lines, resonates in two basic for broadening the operating bandwidth. Output ports maintains equal distance from the input in order to achieve in-phase power divisions. The prototype structure provides an equal magnitude, in-phase power division and adequate isolation at outputs from 3.82 to 10.2 GHz, which almost complies the FCC defined UWB frequency range. It has advantages like single layer, via free and compact in size.
Ultra-wideband power divider using three parallel-coupled lines and one shunt stub
An ultra-wideband power divider with out-of-band filtering and DC blocking functions is presented. The divider consists of three parallel-coupled lines, a short-circuited shunt stub and a resistor. The divider was implemented in a two-layer printed circuit board with a high dielectric constant. The measurements show a minimum insertion loss of −0.4 dB in the middle band and a rejection of −17 to −18 dBc at 1.5 and 11.5 GHz, respectively.
An UWB planar out-of-phase power divider employing microstrip-slot and parallel stripline-microstrip transitions
The design of a planar out-of-phase power divider with an ultra wideband (UWB) performance is presented. The device employs two substrates with a common ground plane. A coupling between two microstrip lines on the top and bottom substrate layers through a slot in the common ground plane, and a transition from two microstrip lines to a parallel stripline are used to achieve an UWB operation. The simulated and measured results of the proposed divider reveal low insertion losses, good return loss at the three ports and fine isolation between the two output ports across the band 3.1 to more than 11 GHz with high phase stability.