High isolation power divider
A high isolation power divider is disclosed, which includes a substrate, a first split arm, a second split arm, a signal input unit, a connection unit, a ground layer, a slit. The signal input unit is coupled to the first split arm and the second split arm for receiving an input signal and dividing the input signal to the first split arm and second split arm. The connection unit is coupled to the first split arm and the second split arm, wherein the connection unit, the first split arm, and the second split arm are deposited on a first plane of the substrate, and surround a first area. The ground layer is deposited on the second plane of the substrate for providing grounding. The slit is formed in the ground layer, wherein at least a part of the slit is formed within a second area corresponding to the first area.
1. A high isolation power divider, comprising:
a substrate comprising a first plane and a second plane;
a first split arm deposited on the first plane of the substrate, wherein the first split arm comprises a first end and a second end;
a second split arm deposited on the first plane of the substrate, wherein the second split arm comprises a first end and a second end;
a signal input unit deposited on the first plane of the substrate, and coupled to the first end of the first split arm and the first end of the second split arm, for receiving an input signal and dividing the input signal to the first split arm and the second split arm;
a connection unit deposited on the first plane of the substrate, and coupled to the second end of the first split arm and the second end of the second split arm, wherein the connection unit, the first split arm, and the second split arm surround a first area;
a ground layer deposited on the second plane of the substrate for providing grounding, wherein the ground layer comprises a second area and the second area is an orthographic projection area of the first area onto the ground layer; and
a slit formed in the ground layer;
wherein at least a part of the slit is formed within the second area.
2. The power divider of claim 1 further comprising:
a first signal output unit deposited on the first plane of the substrate, and coupled to the second end of the first split arm, for outputting the input signal from the first split arm; and
a second signal output unit deposited on the first plane of the substrate, and coupled to the second end of the second split arm, for outputting the input signal from the second split arm.
3. The power divider of claim 1 , wherein the slit is a rectangular-shaped slit.
4. The power divider of claim 3 , wherein the slit is a long and narrow rectangular-shaped slit.
5. The power divider of claim 1 , wherein the slit is a trapezoidal-shaped slit.
6. The power divider of claim 5 , wherein a top base plane of the slit is located within the second area.
7. The power divider of claim 5 , wherein length of the top base plane and the bottom base plane of the slit are both relative to resonance frequencies of the power divider.
8. The power divider of claim 1 , wherein the slit is formed in the ground layer by an etching process.
9. The power divider of claim 1 , wherein the first split arm, the second split arm, the signal input unit, and the connection unit are microstrip line structures.
10. The power divider of claim 1 , wherein the substrate is an RO4233 substrate.
11. The power divider of claim 1 , wherein the power divider operates at Ku-band.
12. The power divider of claim 1 , wherein the power divider operates at Ka-band.
13. The power divider of claim 1 , wherein length of the first split arm is equal to length of the second split arm.