Communications: directive radio wave systems and devices (e.g. – With particular circuit – For frequency modulation
Reexamination Certificate
2003-07-29
2004-06-01
Mis, David (Department: 2817)
Communications: directive radio wave systems and devices (e.g.,
With particular circuit
For frequency modulation
C342S202000, C331S096000, C331S1070DP, C331S1070SL, C331S185000
Reexamination Certificate
active
06744402
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a high-frequency diode oscillator which is a high-frequency oscillator such as a Gunn diode oscillator built in, for example, a high-frequency circuit such as a millimeter-wave integrated circuit and in which a nonradiative dielectric waveguide is used, and also relates to a millimeter-wave transmitting/receiving apparatus equipped with this high-frequency diode oscillator.
2. Description of the Related Art
A conventional Gunn diode oscillator is shown in FIG.
31
. In
FIG. 31
, reference numeral
201
denotes a pair of parallel plate conductors. By setting an interval z between the conductors to z≦&lgr;/2, a so-called nonradiative dielectric waveguide (referred to as an NRD guide, hereafter) is configured, which prevents noise from entering from outside into a dielectric strip
207
and prevents high-frequency signals from radiating outside, thereby transmitting signals. Herein, &lgr; represents the wavelength of an electromagnetic wave (high-frequency signal) which propagates in the air at a used frequency.
Further, reference numeral
202
denotes a nearly rectangular parallelepiped metal member such as a metal block for mounting a Gunn diode device, reference numeral
203
denotes a Gunn diode device which is a kind of microwave diodes for oscillating microwaves, reference numeral
204
denotes a wiring board which is mounted on one side surface of the metal member
202
and which is provided with a choke-type bias supply strip
204
a
for supplying a bias voltage to the Gunn diode device
203
and functioning as a low-pass filter for preventing leakage of high-frequency signals, reference numeral
205
denotes a strip conductor such as a metal foil ribbon which connects the choke-type bias supply strip
204
a
and the upper conductor of the Gunn diode device
203
, reference numeral
206
denotes a metal strip resonator which is made by disposing a resonating metal strip line
206
a
to a dielectric base, and reference numeral
207
denotes a dielectric strip which transmits high-frequency signals resonated by the metal strip resonator
206
to the outside. In
FIG. 31
, the upper one of the parallel plate conductors
201
is partially cut away in order to show the interior thereof.
In the NRD guide type of Gunn diode oscillator of
FIG. 31
, the metal member
202
mounted with the Gunn diode device
203
is disposed between the pair of parallel plate conductors
201
. High-frequency signals (electromagnetic waves) such as microwaves oscillated from the Gunn diode device
203
are led out to the dielectric strip
207
via the metal strip resonator
206
having the metal strip line
206
a.
Then, in the choke-type bias supply strip
204
a
, a choke in which the spatial cycle (length of one) of wide strips and the spatial cycle (length of one) of narrow strips are repeated by a cycle of approximately &lgr;/4, respectively, is formed as shown in FIG.
32
. Further, the length of the strip conductor
205
is also set to approximately &lgr;/4, and the strip conductor
205
functions as part of a low-pass filter.
However, the conventional Gunn diode oscillator is configured so that the metal strip resonator
206
, the metal member
202
for mounting the Gunn diode device
203
, and the dielectric strip
207
are registered individually and interposed between the parallel plate conductors
201
,
201
. For this reason, the position of the metal strip resonator
206
varies due to vibration and its weight in the case where the processing accuracy of the metal strip resonator
206
is low, and propagation characteristics to the dielectric strip
207
is deteriorated in the case where the resonator is not accurately registered. That is to say, the conventional Gunn diode oscillator has a problem that the processing accuracy and positioning accuracy of the metal strip resonator
206
need to be controlled, workability in production is bad, and therefore the oscillator is not suitable for mass production.
In
FIGS. 31 and 32
, the strip
204
a
of the wiring board
204
is diagonally shaded so that the configuration is clearly shown. This in true in other drawings attached to the specification of this application.
FIG. 33
is a partially cutaway view in perspective of another prior art. This prior art of
FIG. 33
is similar to the prior art as shown in
FIGS. 31 and 32
, and like elements will be denoted by like reference numerals. A dielectric strip
207
disposed in the vicinity of a Gunn diode
203
has a function of receiving high-frequency signals and propagating outside. A strip conductor
205
is spanned between a choke-type bias supply strip
204
a
and the Gunn diode
203
, spaced at a predetermined interval from the surface of a metal member
202
. A square-pole-like dielectric chip
309
is disposed close to a strip conductor
205
to be electromagnetically connected thereto, whereby it is made possible to control the oscillation frequency of high-frequency signals.
The prior art as shown in
FIG. 33
also has the same problem as the prior art as shown in
FIGS. 31 and 32
.
FIG. 34
is a partially cutaway view in perspective of still another prior art, and
FIG. 35
is a perspective view showing the configuration of part of the prior art as shown in FIG.
34
. This prior art as shown in
FIGS. 34 and 35
is similar to the prior art as shown in
FIGS. 31-33
, and like elements will be denoted by like reference numerals. In specific, in the prior art of
FIGS. 34 and 35
, a wiring board
208
provided with a varactor diode
210
which is a frequency modulating diode and a kind of variable capacitance diode is mounted on a mid-portion of a dielectric strip
207
. A bias voltage applying direction B of the varactor diode
210
is set to a direction which is perpendicular to a propagation direction D of high-frequency signals in the dielectric strip
207
and parallel to the main surfaces of parallel plate conductors
201
. The bias voltage applying direction B coincides with an electric field direction E of LSM
01
mode of high-frequency signals which propagate in the dielectric strip
207
. With this, by electromagnetically coupling high-frequency signals and the varactor diode
210
and controlling a bias voltage to change the capacitance of the varactor diode
210
, it is possible to control the oscillation frequency of high-frequency signals. Further, reference numeral
209
denotes a dielectric plate with high relative dielectric constant for matching the impedance of the varactor diode
210
and that of the dielectric strip
207
, In
FIG. 34
, the upper one of the parallel plate conductors
201
is partially cut away in order to show the interior thereof.
Further, as shown in
FIG. 35
, a second choke-type bias supply strip
212
is formed on one main surface of the wiring board
208
, and a beam lead type of varactor diode
210
is disposed on a mid-portion of the second choke-type bias supply strip
212
. At a connecting portion of the second choke-type bias supply strip
212
to the varactor diode
210
, an electrode
211
is formed.
Then, high-frequency signals oscillated from a Gunn diode
203
are led out to the dielectric strip
207
through a metal strip resonator
206
. Subsequently, the high-frequency signals are partially reflected at the varactor diode
210
, and return toward the Gunn diode
203
. As the reflection signals change together with the capacitance of the varactor diode
210
, the oscillation frequency changes.
In the choke-type bias supply strip
204
a
, wide strips and narrow strips are alternately formed to construct a choke in which the length of one wide strip and the length of one narrow strip are approximately &lgr;/4, respectively. Further, the length of a strip conductor
205
is also set to approximately &lgr;/4, and the strip conductor
205
functions as part of a low-pass filter.
However, this conventional Gunn diode oscillator is configured so that high-frequency signals pass through the wiring board
208
mounted with the varactor diode
210
Hiramatsu Nobuki
Kawata Toshihiko
Kii Hironori
Hogan & Hartson
Kyocera Corporation
Mis David
LandOfFree
High-frequency diode oscillator and millimeter-wave... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with High-frequency diode oscillator and millimeter-wave..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High-frequency diode oscillator and millimeter-wave... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3357898