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Basics Selection 17.7GHz To 23.55GHz RF Directional Coupler

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Chengdu SinoScite Technology Co., Ltd.

Basics Selection 17.7GHz To 23.55GHz RF Directional Coupler

Country/Region	china
City & Province	chengdu sichuan
Categories	Laser Equipment Parts

Product Details

Passive Devices RF Coupler Basics & Selection RF & Microwave Couplers

Quick Details

1	Product Type	Coupler
2	Model	CP17.7-21GS-3150
3	Working Frequency	17.7-23.55GHz
4	Insertion Loss	≤1.1dB
5	In-Band Fluctuation	≤0.5dB
6	Coupling	20±1.5dB
7	Coupling Consistency	≤±0.8dB
8	Directionality	≥15dB
9	Input And Output VSWR	≤1.4
10	Coupled Port VSWR	≤1.5
11	Input And Output Interface	Coaxial (2.92-K)
12	Coupling Port Output	Coaxial (2.92-K)
13	Material	Brass silver plated
14	Surface Treatment	Black paint

Working principle

The power transmitted in the main line is coupled to the secondary line through a variety of ways, and interferes with each other and only transmits in one direction in the secondary line.

Figure 1 shows three typical coupling structures of rectangular waveguide directional couplers. a is the two-hole coupling separated by 1/4 guide wavelength; b is the double series branch line coupling with the spacing and length equal to 1/4 guide wavelength; c is the continuous coupling of TE and TE propagation modes in the crack area. Take the two structures of a and b as examples. After the signal input from port ① is coupled to the secondary line in two ways, it is superimposed in phase due to the same stroke in the direction of port ④, and there is output; in the direction of ③, the stroke differs by 1/2 guide wavelength The reverse phase cancellation is isolated without output.

Figure 2 shows two typical coupling structures of the microstrip directional coupler. A is the dual parallel branch line coupling with the pitch and length equal to 1/4 of the lead wavelength, and b is the continuous coupling of the electric and magnetic fields in the parallel region. Taking the structure of b as an example, the signal input from port ① is coupled to the two ports of the secondary line by electric field to generate in-phase induced voltage, and magnetic field coupling generates reverse-phase induced voltage. The result is added at port ④ and there is output, and at ③, it is cancelled and there is no output in isolation.

In addition, it can also form a directional coupler for other transmission lines (Figure 3).

Figure 1

Figure 2

Figure 3