JP3042063B2 - Microwave circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microwave circuit, and more particularly to a hybrid component and an NRD (Non-Digital).
The present invention relates to a microwave circuit that is electrically connected to a radiative guide.

[0002]

2. Description of the Related Art Heretofore, a method of electrically connecting a microwave signal pin of a hybrid IC using a bottom header in a microwave circuit to an NRD guide has not yet been realized. The NRD guide is particularly effective when used above the millimeter wave band. On the other hand, amplifiers, oscillators, mixers, and the like, which are microwave components in the millimeter wave band or higher, can obtain desired characteristics by forming an integrated circuit using a semiconductor pair chip. Therefore, electrical connection between the NRD guide and the microwave component has become a very important technology.

[0003]

The connection method between the above-mentioned conventional hybrid component and the NRD guide is N
RD guide is also a relatively new millimeter wave band transmission line,
The desired connection technology has not been developed.

[0004]

According to the microwave circuit of the present invention, the distance between the parallel plate conductors is λ with respect to the wavelength λ of the desired frequency.
/ 2 NRD guides, each having two rectangular parallelepiped shaped dielectric strips sandwiched between the parallel plate conductors and being inserted opposite to each other, and each of the two dielectric strips facing each other. It has a first hole provided at a position of λd / 4 (input d is a wavelength in the dielectric strip) from an end face, and a second hole of a parallel plate conductor aligned with the first hole, A lower header having a microwave signal pin coming out of the hybrid IC is attached to the outer surface of the parallel plate conductor of the NRD guide, and the microwave signal pin is connected to the first
And the second hole.

[0005]

Next, the present invention will be described with reference to the drawings. 1 (a) and 1 (b) are a plan view of an embodiment of the present invention and a cross-sectional view taken along line AA of FIG. 1 (a), and FIG. 2 is an enlarged view of a coupling portion with an NRD guide. In FIG. 1, reference numeral 1 denotes a downward hybrid IC in which a microwave signal pin 4 projects downward, 2A and 2B denote two upper and lower parallel plate conductors forming an NRD guide, and 3 denotes a parallel plate conductor 2A and 2B. Reference numeral 4 denotes two microwave signal pins, 5 denotes a hole passing through the parallel plate conductor 2A, and 6 denotes a blind hole of the dielectric strip 3. The lower hybrid IC 1 is attached to the parallel plate conductor 2,
Microwave signal pins 4 are inserted into holes 5 and 6. Hole 5
Forms a coaxial line with the microwave signal pin 4,
The desired impedance is determined by the diameter of the microwave signal pin and the diameter of the hole 5. Λ / 2 between the parallel plate conductors 2A and 2B
With the following interval, the lowest LSE01 mode among the propagation modes of the NRD guide can be strongly coupled with the microwave signal pin 4 in terms of its magnetic field distribution. On the other hand, the other lowest order mode, LSM01 mode, has a very weak coupling because the magnetic field distribution is parallel to the microwave signal pin 4 and does not cross it. As for the degree of coupling with the LSE01 mode, when the length l in FIG. 1 is set to the wavelength λd of the propagation signal in the NRD guide, the coupling can be strengthened when the wavelength is approximately λd / 4. Further, there is a pin 7 such as a bias supply other than the microwave signal pin 4, and a bias is supplied to the pin 7 from outside the NRD guide. At this time, the end of the dielectric strip 3 is used as a metal plate 9 to cut off the connection with the pin 7 so as not to hinder the signal propagation of the NRD guide. The connection between the NRD guide and the microwave signal pin 4 is adjusted by attaching a conductor probe 8 to the microwave signal pin 4 as necessary, as shown in FIG.

[0006]

As described above, according to the present invention, the lowest order mode LSE01 mode of the NRD guide and the lower hybrid IC can be electrically coupled, and particularly in the configuration of the microwave circuit in the field of the millimeter wave band or higher. In addition, there is an effect that the connection between the NRD guide and the hybrid IC can be realized with small size and low loss characteristics.

[Brief description of the drawings]

FIG. 1 is a plan view (a) of an embodiment of the present invention and FIG.
It is an AA sectional view (b) of (a).

FIG. 2 is an enlarged view of a coupling portion with an NRD guide of the present embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower hybrid IC 2A, 2B Parallel plate conductor 3 Dielectric strip 4 Microwave signal pin 5, 6 hole 7 pin 8 Metal probe

────────────────────────────────────────────────── ─── Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01P 5/08 H01P 3/16 JICST file (JOIS)

Claims (2)

(57) [Claims] 1. A two-sided dielectric strip having a rectangular parallelepiped shape in which the interval between parallel plate conductors is arranged to be λ / 2 or less with respect to a wavelength λ of a desired frequency and sandwiched between the parallel plate conductors. Guides inserted from each other and λd / 4 from the opposing end faces of the two dielectric strips.
(Where λd is the wavelength in the dielectric strip) and a second hole of a parallel plate conductor aligned with the first hole. A microwave circuit comprising: a lower header having pins protruding attached to an outer surface of a parallel plate conductor of the NRD guide; and the microwave signal pins inserted into the first and second holes. . 2. A bias power supply connecting pin of the hybrid IC is arranged so as to protrude between two opposing dielectric strips of the NRD guide, and is connected to the parallel plate conductor at opposing end faces of the dielectric strip. 2. The microwave circuit according to claim 1, further comprising a metal plate mounted thereon.