Abstract: In this work, we present a

frequency transformation based dual-band filter design approach using scattering based real frequency technique.

From (1), we can see that each [g.sub.k,m][n] is the different time and

frequency transformation of prototype filter g[n].

The authors developed the

frequency transformation for finding the locations of poles and zeros of specific tri-band filters [5].

Agrobacterium mediated high

frequency transformation of an elite Indica rice variety Pusa Basmati 1 and transmission of the transgenes to R2 progeny.

Therefore by using

frequency transformation technique 1D signal is transformed into 2D form.

The k-th coefficients of a

frequency transformation represent similar frequencies, provided that the number of values in the time space is similar.

Obviously, now having different [f.sub.sk] for each resonator, the

frequency transformation (Equation 3A) will no longer be strictly meaningful.

Hagiware, "Synthesis of dual-band bandpass filters using successive

frequency transformation and circuit conversions," IEEE Microwave and Wireless Components Letters, Vol.

The same method can be used for variable cut-off frequency, using the very basic

frequency transformation: the low-pass to low-pass filter transformation.

In order to avoid the optimization technique, a method called the

frequency transformation technique has been presented in designing the dual-band BPF.

A

frequency transformation can also be performed and the spectral composition of the error signal alone can be viewed.

The proposed method is based on the evaluation of the characteristic polynomials of the diplexer using the proposed linear

frequency transformation and established method in [6], and then coupling matrix of overall resonator diplexer can be obtained using the proposed hybrid optimization methods.