Ultra-wideband coaxial-waveguide power divider with flat group delay response

Abstract

A novel ultra-wideband (UWB) coaxial-waveguide power divider is presented. The design approach for the presented power divider has been developed; and a four-way UWB coaxial-waveguide power divider has been designed, fabricated and measured. The measured results show good agreement with the simulated ones.Introduction: Waveguide-based power dividers have been widely used in microwave and millimetre-wave circuits and communication systems because of their low insertion loss, wide bandwidth and high power capability. Several waveguide-based power dividers/combiners, such as rectangular waveguide power dividers, radial waveguide power dividers and coaxial waveguide power dividers, have been studied and good performance reported [1][2][3][4][5]. In addition, ultra-wideband (UWB) devices and circuits have been developed greatly, and various broadband and UWB power dividers have been presented and studied [6 -8]. However, few waveguide-based UWB power dividers have been developed.A novel UWB coaxial-waveguide four-way power divider is developed. This four-way coaxial power divider employs a coaxial taper transition, an oversized coaxial waveguide and four coaxial probes. A step at the inner conductor has been used to change the electric field orientation from radial to axial, which can make the output ports and the input port in the same direction. Compared with the structure shown in [5], the proposed power-dividing structure may be easier to construct than the active power-combining system. The proposed coaxial-waveguide power divider has been designed, fabricated and measured. Experimental results show that the proposed coaxial-waveguide power divider has the advantages of wide bandwidth, excellent input impedance matching, low insertion loss and flat group delay within the UWB passband.

Compact Microstrip Uwb Power Divider With Dual Notched Bands Using Dual-Mode Resonator

“…As we can see, the bandwidth of the UWB power divider decreases as Y 3 increases, and increases as f 0 as θ 4 , Y 4 increase. In this way, the bandwidth for the passband of the UWB power divider with the SRMMRs can be conveniently controlled by varying the characteristic matrix Y 3 , Y 4 and θ 4 when Y 1 , Y 2 and θ 1 , θ 2 are fixed. Therefore, by properly tuning the dimensions of the SRMMRs, a new compact microstrip UWB power divider can be achieved with a wanted bandwidth.…”

“…With the rapid growth of unlicensed use of ultra-wideband (UWB) for radar imaging system, short-range broadband communication, and indoor wireless communications systems, there has been tremendous interest in exploration of various UWB components allocated 3.1 ∼ 10.6 GHz band. To achieve this goal, a few typical methods to design UWB power dividers have been developed so far [1][2][3][4][5][6][7][8][9][10].…”

“…However, the fractional bandwidth is not ideal. In [4], a waveguide power divider with high power capacity and very low insertion loss is designed. However, the waveguide structure is large and inflexible.…”

A New Printed Microstrip Uwb Power Divider With Notched Band

“…With the rapid growth of unlicensed use of ultra-wideband (UWB) for radar imaging system, short-range broadband communication, and indoor wireless communications systems, there has been tremendous interest in exploration of various UWB components allocated 3.1 ∼ 10.6 GHz band. To achieve this goal, a few typical methods to design UWB power dividers have been developed so far [1][2][3][4][5].…”

“…However, the fractional bandwidth is not ideal. In [3], the waveguide power divider with high power capacity and very low insertion loss is designed. However, the waveguide structure is large and inflexible.…”