s-3 DIELECTRIC
RESDNATDR
HEg4
GIGA
~+fl
MODE COUPLING
(now with Frequency
123,
Abstract
rue
Av. Baltique Les Ulis FRANCE.
Sources,
Albert
inc., Lanham,
presented to effectively to a microstrip line
mode. For this mode, dipole perpendicular is improved The f. Q. product to TE018 mode.
Introduction
couple a using the
In the dielectric
resonator acts as to the resonator axis. by about 50 % compared
:
been
mainly
directed
towards
the
applica-
The
increased
resonant
factor
as
frequency
compared
to
that
as of
we Q1 as the
mode configuration. Experimental results TEold HE ~ld+flmode coupling to a shielded microstrip presented and compared to TE016 mode at C and
of
Field mode
coupling
patterns of is presented
:
(O <6
the open in fig.I.
the
patterns sibility Fig. 2a
In
0149-645X/83/0000-0187
mode (fig.
magnetic 2b and
HE1ld+l
for which the resonator dipole perpendicular to of the HE116 +1 field
$01.00
coupling 2c).
@ 1983 IEEE
the
mode
The ting axis
to
the shield we obtain
coincides a metalised
placed to the
wj.th O.R.
on a, shielded substrate substrate plane[fig.2b,
an experimental configuration treated theoretically except elements. of
the
[fig.31
as
HEq16+q
with
{3]
the
mode
canb!y
resembles
coupling
coeffi-
: ’110
1-s210
-
l-sl10
conditions, the resonator
proposed
as
well
’210
configuration,
the
of
the
[dis-
TEO ~ mOde is
lnOt
resonator. axial orientation o ~ the increased unloaded quality factor higher stored energy in the HETT6+1
as due to the fact that with respect mode configuration, the largest part is farther from the substrate ground
for
reflection
and
adjusting
the
transmission
Simultaneous coupling crostrip lines in the
re–
(3 is a function and the line.
of
HE mode can equally well be excited by rl~tat~~d~~electric resonator around its vertical an additional control [fig.2cl, providing, thus,
parameter
a pas~band
to that of a magnetic dipole suggest the posof the magnetic coupling of this mode. shows the commonly used TE016 mode and the PrO-
posed HE116 ,1 ,microstrip line
6 defined
mode
excited due to the We think that the is due to inherent
Here HE116+1 designates the hybrid resonant mode for which the resonator acts as a deformed magnetic dipole perpendicular to the cylindrical axis. ~,n the same way HEqld will designate the resonant hybrid mode acts as a deformed electric senator axis,. The resemblance
TEO16
‘f
‘0 ‘he TEO16 the resonator plane. resona~or
is
circuit
xed shielding tance between
line, are X band.
< 11
dielectric
where walls.
calculations HE1fl& mode,,
the reflection and ‘transwhere S110 and S240 represent mission coefficients at the resonant frequency in the symmetry plane of the dielectric resonator. Under fi-
used
For millimetric wave applications the reduced size of the TE016 mode dielectric resonator creates coupling problems. The HEqld+lmode, with a more practical size for coupling and a higher quality factor, is expected to offer a practical solution.
!!EIld+qmode
CNRS
presented the the shielded
%10 ~.—-.—=_ 5210
unloaded
commonly
du
{2} for
limiting case resonator
equivalent
‘hat cient
commonly used configuration. The HE IId+TOde ‘s known to have a resonant frequency higher than that of TEOfld mode for certain diameter/height ratios of the dielectric resonator . The configuration presented here aIIOWS the effective coupling of the HEflq +Imode which an
recently frequency
2c].Presently such not be rigorously means of 30 finite
integrated cirtions ‘f TEO16 mode in the microwave cuits which IS considered fundamental. The higher order and hybrid modes have either low quality factors or are difficult to couple to a microstrip line in the
has
356
where the resonator with it axis parallel
Recent developments of the stable dielectric resonators has generated a lot of interest in their use in the active and passive MIC circuits [1). In the past the has
n“
Cedex
In this case, degenerate in a the HEll~ +! mode will TE112 mode and the HEtq& In a TEqlq mode. This is consistent with the increase of resonant frequency when the shield is brought nearer to the O.R. as confi]-med by calculations using the same shielded configuration as in {2}.This theoretical situation with metallic walls nearer D.R. is not far from the experimental one
the
116 +1 a magnetic
quality
L.A.
Thomas 87060 LIMOGES - FRANCE -.
Fiedziuszko of resonant
HE
attention
MD 20706)
M. GUEOIRA Microondes -
:
A configuration is dielectric resonator
LINE.
-
Y. GARAULT Electronique dee
Lab.
MICROSTRIP
A.P.S. KHANNA INSTRUMENTATIOII
Immeuble Atlas Z.A. Courtaboeuf 91941
and
TD A SHIELDED
achieved
filter ‘ith
and
phase
of
the
coefficient.
of the HE1ld+q short circuit
with ‘Eold
magnitude
a higher
mode plane
selectivity
with tw~ miresults in than
that
‘ode”
a shieLded 527
1983 IEEE MTT-S
DIGEST