Yantel Corporation

Add

3F, Building 3, Southern District 2 of Zhongguan Honghualing Industrial Park, Xili, Nanshan, Shenzhen, China

Tel

86-755-8355-1886 Fax

86-755-8355-2533

For detailed performance specs & shopping online see Yantel web site : www.yantel-corp.com

R

HC1900B03

Rev A0

DUT

Por t 1 Port 2

Por t 3 Port 4

Vector

Network

Analyzer

Frequency Range(MHz)

Demo Board Loss (dB) @25℃

470-860

0.07

800-1000

0.10

1200-1700

0.15

1700-2000

0.15

2000-2300

2300-2700

0.20

0.25

Note:

1. When calculating insertion loss at room temperature,

demo board loss should be removed from both coupling & transmission data.

Please refer to the below table for demo board loss :

(

)

(

)

Definition of Measured Specifications

Parameter

Definition

Mathematical Representation

VSWR

(Voltage Standing Wave

Ratio)

The impedance match of

the coupler to a 50

W

system. A VSWR of 1:1 is

optimal.

VSWR =

min

max

V

V

Vmax = voltage maxima of a standing wave

Vmin = voltage minima of a standing wave

Return Loss

The impedance match of

the coupler to a 50

W

system. Return Loss is

an alternate means to

express VSWR.

Return Loss (dB)= 20log

1

-

VSWR

1

VSWR

+

Insertion Loss

The input power divided

by the sum of the power

at the two output ports.

Insertion Loss(dB)= 10log

transmission

cpl

in

P

P

P

+

Isolation

The input power divided

by the power at the

isolated port.

Isolation(dB)= 10log

iso

in

P

P

Phase Balance

The difference in phase

angle between the two

output ports.

Phase at coupled port – Phase at transmisson port

Amplitude Balance

The power at each output

divided by the average

power of the two outputs.

10log

+

2

P

P

P

transmission

cpl

cpl

and 10log

+

2

P

P

P

transmission

cpl

transmission

1. Calibrating your vector network analyzer.

2. Connect the VNA 4 Port to DUT respectively.

3. Measure the data of coupling through port 1 to port 4(S41).

4. Measure the data of transmission through port 1 to port 3(S31).

5. Measure the data of isolation through port 1 to port 2(S21).

6. Measure the data of phase port 4 & port 3(port 1 feeding).

7. Measure the data of return loss port 1, port 2, port 3 & port 4.

8. According to the above data to calculate insertion loss,

amplitude balance & phase.

Test Method