... halves with respect to its symmetrical interface.
When an even excitation is applied to the network, as indicated in Figure 2.4(a), the
symmetrical interface is open-circuited, and the two network ... generalized scattering matrix
of suspended microstrip step discontinuities,” Electronics Letters, 25, no.5, March
1989, 335–336.
[10] J S. Hong and J M. Shi, “Modeling microstrip step discon...
... spectrum is the visible optical spectrum,
the ultraviolet spectrum, and x-rays. Below the microwave frequency spectrum is
the radio frequency (RF) spectrum. The frequency boundary between RF and mi-
crowaves ... factors of filter
elements on filter performance are also discussed.
Chapter 4 summarizes basic concepts and design equations for microstrip lines,
coupled microstrip lines, an...
... a 7-pole (n = 7) Butterworth
prototype should be chosen.
3.2.2 Chebyshev Lowpass Prototype Filters
For Chebyshev lowpass prototype filters having a transfer function given in (3.9)
with a passband ... describes basic concepts and theories that form the foundation for de-
sign of general RF/ microwave filters, including microstrip filters. The topics will
cover filter transfer functions, lo...
... here for easy reference.
4.1 MICROSTRIP LINES
4.1.1 Microstrip Structure
The general structure of a microstrip is illustrated in Figure 4.1. A conducting strip
(microstrip line) with a width ... OF MICROSTRIP LINES
There are several derivatives of microstrip lines that can be used as alternative struc-
tures for microstrip filter implementations. These include suspended and inve...
... Semilumped Lowpass Filters Having Finite-Frequency
Attenuation Poles
The previous two types of microstrip lowpass filter realize the lowpass prototype
filters having their frequencies of infinite ... EM
simulated performance of the filter.
(a)
(b)
Z
0
= 50 ohm C
1
= C
7
= 3.7596 pF
L
2
= L
6
= 11.322 nH C
3
= C
5
= 6.6737 pF
L
4
= 12.52 nH
The microstrip filter design uses a substrate hav...
... 6006) having a relative dielectric constant of 6.15
and thickness of 1.27 mm is chosen for this microstrip filter realization. Using the
microstrip design equations given in Chapter 4, the microstrip ... FILTERS
189
6.5
6.5
1.1
w
i
=0.3
0.3
Port 1
(RF Input)
Port 2
(RF Output)
Port 3
(DC Bias)
Unit: mm
r
=
5
.
0
o
A
B
α
=90
o
(a)
(b)
FIGURE 6.15 (a) A microstrip bias T incorporat...
... (MEMS) provide a class of new devices and com-
ponents which display superior high-frequency performance and enable new system
capabilities. For a general definition, a MEMS is a miniature device ... three-pole active microstrip bandpass filter. P1 and P2 are the RF
ports. Bias is applied to the pins labeled D1, D2, D3, G1, G2, and G3. (b) Measured performance of the
active microstrip f...
... input/output (I/O) coupling structures for coupled microstrip resonator
filters, namely the tapped line and the coupled line structures, are shown with the
microstrip open-loop resonator, though other ... demonstrate extracting coupling coefficients of asynchronously tuned, coupled
microstrip resonators, let us consider the coupled microstrip open-loop resonators
in Figure 8.15(c) and...
... all the numerical methods, is due to the fi-
nite cell or mesh sizes. These EM simulators divide a RF/ microwave filter structure
into subsections or cells with 2D or 3D meshing, and then solve ... materials and labor. Microstrip
filters using conventional printed circuit boards are of low cost in themselves. Using
better materials such as superconductors can give better performance of fil...
... the
improvement in selectivity over the Chebyshev filter is evident. The closer the atten-
uation poles to the cut-off frequency (⍀ = 1), the sharper the filter skirt and the
higher the selectivity.
⍀
a
FBW ... fabricated filter using copper microstrip. The size of the filter amounts to
324
ADVANCED RF/ MICROWAVE FILTERS
FIGURE 10.6 (a) Photograph of the fabricated eight-pole microstrip b...