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Conventional dual mode filters are realized by perturbing the electromagnetic field of ring resonator structures such that two orthogonal resonant modes occur, yielding a dual mode response. Due to the inherent resonant characteristic, the electrical length needed to establish the resonant condition is 360°. However it is felt that the size is still too large and unacceptable for the design of high...
Dual mode filters have been widely used in wireless communications systems due to their advantageous of being small size, planar and low loss. Most of the dual mode filters are realized based upon dual mode ring or patch resonator such that the two orthogonal resonant modes occur, yielding a dual mode response. However the electrical length needed to establish the resonant condition is still considerably...
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