Planar Dual-Band Branch-Line Coupler With Large Frequency Ratio

Planar Dual-Band Branch-Line Coupler With Large Frequency Ratio

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This work presents a novel planar branch-line read more coupler topology developed for dual-band operation using an E-shaped impedance transformer network to supplant the conventional microstrip line.Explicit closed-form design equations for dual-band operation are derived using the ABCD matrices.The studied coupler features a large dual-band frequency ratio with a compact size.A prototype coupler centered at 1 and 8 GHz is first presented and experimentally examined to demonstrate the large frequency ratio.Further, another prototype coupler centered at 2.

4 and 5.2 GHz for potential WLAN applications is also developed and experimentally characterized.Measurements and simulations for both prototype couplers show good here performance within the studied dual-band frequencies.