Using phase relations in microstrip directional couplers to achieve high directivity
Date
2013
Authors
Tas, V.
Atalar, Abdullah
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Abstract
We analyze the microstrip directional couplers with a special focus on the phase difference between the coupled and isolated ports. The analysis uses the even-odd mode decomposition technique and network theory. The results show that the phase difference between the signals at the coupled port and the isolated port is close to \pi in a very wide band. This property can be used to achieve a broadband directivity by inducing a voltage cancellation at the isolated port of the couplers. Two different cancellation methods are investigated. Analytical formulas for the required component values of both methods are given. Higher directivity can be obtained at the expense of reduced bandwidth.
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IEEE Transactions on Microwave Theory and Techniques
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Keywords
Broadband microstrip coupler, Coupler phase relations, Coupling isolation phase difference, High directivity, Analytical formulas, High-directivity, Isolated ports, Microstrip coupler, Mode decomposition techniques, Phase difference, Phase relation, Reduced bandwidths, Microwave circuits, Microwaves, Directional couplers
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Language
English
Type
Article