High frequency circuit and radar device
A high frequency circuit and radar device is disclosed. The high frequency circuit includes a microstrip line (MSL), a suspended line (SML), and a connector (MTP). The MSL includes a dielectric substrate having opposing first surfaces and second surfaces, a first signal conductor arranged on the first surface, and a ground conductor arranged on the second surface. The SML includes a dielectric substrate, a second signal conductor arranged on the first surface, and a metal housing arranged from the second surface through a cavity. The MTP includes a dielectric substrate, a signal conductor connecting the first signal conductor and the second signal conductor, and a metal housing arranged from the second surface through a lower cavity. The height of the lower cavity gradually increases from the first end to the second end.
1 . A high-frequency circuit comprising:
a dielectric substrate having a first surface and a second surface opposed to each other;
a metal layer;
a microstrip line comprising:
a first signal conductor disposed on the first surface of the dielectric substrate; and
a ground conductor disposed between the second surface of the dielectric substrate and the metal layer;
a suspended line comprising:
a second signal conductor disposed on the first surface of the dielectric substrate; and
a lower cavity disposed between the second surface of the dielectric substrate and the metal layer; and
a connector comprising:
a connected conductor disposed on the first surface of the dielectric substrate, the connected conductor connecting the first signal conductor to the second signal conductor; and
a transitional lower cavity disposed between the second surface of the dielectric substrate and the metal layer, wherein:
a width of the connected conductor continuously increases from a first end connecting to the first signal conductor toward a second end connecting to the second signal conductor; and
a height of the transitional lower cavity continuously increases from the first end toward the second end.
2 . The high-frequency circuit of claim 1 , wherein the width of the connected conductor is designed:
to vary continuously; and
to be the width of the first signal conductor at the first end and the width of the second signal conductor at the second end.
3 . The high-frequency circuit of claim 1 , wherein the width of the connected conductor is designed:
to vary gradually and discretely; and
to be the width of the first signal conductor at the first end and the width of the second signal conductor at the second end.
4 . The high-frequency circuit of claim 1 , wherein the distance between the dielectric substrate and the metal layer at the transitional lower cavity is designed:
to vary continuously; and
to be the distance between the dielectric substrate and the metal layer at the lower cavity at the second end.
5 . The high-frequency circuit of claim 1 , wherein the distance between the dielectric substrate and the metal layer at the transitional lower cavity is designed:
to vary discretely; and
to be the distance between the dielectric substrate and the metal layer at the lower cavity at the second end.
6 . The high-frequency circuit of claim 1 , wherein the metal layer is a metal enclosure surrounding the microstrip line and the suspended line.
7 . The high-frequency circuit of claim 1 , wherein the metal layer is a metal film formed on an insulator.
8 . A radar comprising:
a high-frequency circuit according to claim 1 ; and
a high-frequency element for the radar to be mounted on the microstrip line of the high-frequency circuit.
9 . A radar comprising:
a high-frequency circuit according to claim 2 ; and
a high-frequency element for the radar to be mounted on the microstrip line of the high-frequency circuit.
10 . A radar comprising:
a high-frequency circuit according to claim 3 ; and
a high-frequency element for the radar to be mounted on the microstrip line of the high-frequency circuit.
11 . A radar comprising:
a high-frequency circuit according to claim 4 ; and
a high-frequency element for the radar to be mounted on the microstrip line of the high-frequency circuit.
12 . A radar comprising:
a high-frequency circuit according to claim 5 ; and
a high-frequency element for the radar to be mounted on the microstrip line of the high-frequency circuit.
13 . A radar comprising:
a high-frequency circuit according to claim 6 ; and
a high-frequency element for the radar to be mounted on the microstrip line of the high-frequency circuit.
14 . A radar comprising:
a high-frequency circuit according to claim 7 ; and
a high-frequency element for the radar to be mounted on the microstrip line of the high-frequency circuit.