Design Of Dual Frequency And Broadband Power Divider

With the rapid progress in modern wireless communication technology, themicrowave power dividers, as one of the most important components, are widely anddeeply researched. Power dividers can divide and combine the power of signals. Inmany microwave circuits, the power dividers have been applied to amplifier, balancemixer, antenna array, and so on. The conventional Wilkinson power divider operatesonly at single frequency and its odd harmonics. It is not suitable for dual-bandmulti-band and wideband applications. In this article, two three-way dual-band powerdividers and three novel wide band dividers are proposed, all of which can satisfy thedemand of dual-band or wideband in modern wireless communication systems.Firstly, the basic characteristic and operation principal of the Wilkinson powerdivider are introduced. The impedance transformer of two-section is analyzed in thisarticle. Then, two dual-band three-way unequal power dividers are designed byintroducing impedance transformer and the formulas used to determine the designparameters are given. Dividers are fabricated and measured, and the measured resultsshow they have good performances.Secondly, a multi-layer broadband power divider is realized by adopting broadsidecoupling structure. A set of formulas used to determine the design parameters are alsogiven based on the theory analysis. The measured results proved the utility andpracticability of the proposed design methods.Finally, two types of Ultra-Wide band power dividers are presented. One type ismultilayer Ultra-Wide band (UWB) in-phase power divider which is constructed byintroducing multilayer microstrip-slotline coupling structure. The design parameters ofthe power divider are computed by applying even-odd mode method. Besides, acompact out-of-phase power divider for UWB application is also proposed, whichutilizes the broadband transition of slot-microstrip lines. A frequency notch is generatedby embedding a couple of SRR DGS in two sides of the slot line. The design methodsand design process of these two power dividers are discussed in details. The goodagreements between measured and simulated results prove the practicability of theproposed methods.