Caption: Figure 3: Normalized admittance
and resonant length regarding the inclined angle.
where [[omega].sub.0] = 1/[square root of([L.sub.i][C.sub.i]) (i = 1,2,3) is the midband angular frequency of filter, FBW = [DELTA][omega]/[[omega].sub.0] is the fractional bandwidth, and [bar.Y] is the normalized admittance
matrix, which in the case of synchronously tuned filter is given by
[Z.sub.B], [Z.sub.0], and [Y.sub.0] are the Bloch impedance, normalized impedance, and normalized admittance
of the transmission line, respectively.
The real part of normalized admittance
is below unit line within the frequency range of DC-1.7 GHz, so the topology of Fig.
[Z.sub.o] is the feed line impedance characteristic of port, and the normalized admittance
matrix of the filter can be obtained by adding the two coupler admittance matrices 
where [Y.sub.m] and [[theta].sub.m] are the normalized admittance
and electrical length of the height-reduced waveguide, respectively.
with [b.sub.C], [b.sub.L] the normalized admittances
, computed via