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[SOLVED] excitation dual mode with 90 degree phase difference using single probe feed for DRA

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redcrystalline

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hi
im exciting dual mode with 90 degree phase difference using single probe feed for DRA, but dont know how make this 90 degree phase difference, could anybody help me?
thanks
 

If a capacitor is inline, and the waveform is a sine, then you'll get some amount of phase shift.

A coil will likewise introduce some amount of phase shift, depending on configuration, component value and frequency.

To get 90 degrees difference you may need a coil and a cap, or 2 stages with caps, or 2 stages with coils.
 

hi
i found that s parameter of our structure is a complex number then it has magnetud and phase , then or job is that choose center frequency in place that s parameter of our two modes have 90 degree phase difference
 

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