Dual Junction Isolator

A double-junction isolator is a passive device commonly used in microwave and millimeter-wave frequency bands to isolate reflected signals from the antenna end. It is composed of the structure of two isolators. Its insertion loss and isolation are typically twice that of a single isolator. If the isolation of a single isolator is 20dB, the isolation of a double-junction isolator can often be 40dB. The port standing wave does not change much.

In the system, when the radio frequency signal is transmitted from the input port to the first ring junction, because one end of the first ring junction is equipped with a radio frequency resistor, its signal can only be transmitted to the input end of the second ring junction. The second loop junction is the same as the first one, with RF resistors installed, the signal will be passed to the output port, and its isolation will be the sum of the isolation of the two loop junctions. The reflected signal returning from the output port will be absorbed by the RF resistor in the second ring junction. In this way, a large degree of isolation between the input and output ports is achieved, effectively reducing reflections and interference in the system.

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Data Sheet

RFTYT 60MHz-18.0GHz RF Dual / Multi Junction Coaxial Isolator
Model	Frequency Range	Bandwidth (max)	Insertion Loss (dB)	Isolation (dB)	VSWR (max)	Forward Power (W)	Reverse Power (W)	Dimension W×L×H（mm）	SMA Data sheet	N Data sheet
TG12060E	80-230MHz	5~30%	1.2	40	1.25	150	10-100	120.060.025.5	SMA PDF	N PDF
TG9662H	300-1250MHz	5~20%	1.2	40	1.25	300	10-100	96.062.026.0	SMA PDF	N PDF
TG9050X	300-1250MHz	5~20%	1.0	40	1.25	300	10-100	90.050.018.0	SMA PDF	N PDF
TG7038X	400-1850MHz	5~20%	0.8	45	1.25	300	10-100	70.038.015.0	SMA PDF	N PDF
TG5028X	700-4200MHz	5~20%	0.6	45	1.25	200	10-100	50.828.515.0	SMA PDF	N PDF
TG7448H	700-4200MHz	5~20%	0.6	45	1.25	200	10-100	73.848.422.5	SMA PDF	N PDF
TG14566K	1.0-2.0GHz	Full	1.4	35	1.40	150	100	145.266.026.0	SMA PDF	/
TG6434A	2.0-4.0GHz	Full	1.2	36	1.30	100	10-100	64.034.021.0	SMA PDF	/
TG5028C	3.0-6.0GHz	Full	1.0	40	1.25	100	10-100	50.828.014.0	SMA PDF	N PDF
TG4223B	4.0-8.0GHz	Full	1.2	34	1.35	30	10	42.022.515.0	SMA PDF	/
TG2619C	8.0-12.0GHz	Full	1.0	36	1.30	30	10	26.019.012.7	SMA PDF	/
RFTYT 60MHz-18.0GHz RF Dual / Multi Junction Drop-in Isolator
Model	Frequency Range	Bandwidth (max)	Insertion Loss (dB)	Isolation (dB)	VSWR (max)	Forward Power (W)	Reverse Power (W)	Dimension W×L×H（mm）	Strip line Data Sheet
WG12060H	80-230MHz	5~30%	1.2	40	1.25	150	10-100	120.060.025.5	PDF	/
WG9662H	300-1250MHz	5~20%	1.2	40	1.25	300	10-100	96.048.024.0	PDF	/
WG9050X	300-1250MHz	5~20%	1.0	40	1.25	300	10-100	96.050.026.5	PDF	/
WG5025X	350-4300MHz	5~15%	0.8	45	1.25	250	10-100	50.825.010.0	PDF	/
WG7038X	400-1850MHz	5~20%	0.8	45	1.25	300	10-100	70.038.013.0	PDF	/
WG4020X	700-2700MHz	5~20%	0.8	45	1.25	100	10-100	40.020.08.6	PDF	/
WG4027X	700-4000MHz	5~20%	0.8	45	1.25	100	10-100	40.027.58.6	PDF	/
WG6434A	2.0-4.0GHz	Full	1.2	36	1.30	100	10-100	64.034.021.0	PDF	/
WG5028C	3.0-6.0GHz	Full	1.0	40	1.25	100	10-100	50.828.014.0	PDF	/
WG4223B	4.0-8.0GHz	Full	1.2	34	1.35	30	10	42.022.515.0	PDF	/
WG2619C	8.0 - 12.0 GHz	Full	1.0	36	1.30	30	5-30	26.019.013.0	PDF	/

Overview

One of the key characteristics of a double-junction isolator is isolation, which reflects the degree of signal isolation between the input port and the output port. Usually, isolation is measured in (dB), and high isolation means better signal isolation. The isolation of double-junction isolators can usually reach tens of decibels or more. Of course, when isolation requires greater time, multi-junction isolators can also be used.

Another important parameter of the double-junction isolator is the insertion loss (Insertion Loss), which refers to the loss of the signal from the input port to the output port. Lower insertion loss means that the signal can travel more efficiently through the isolator. Double-junction isolators generally have very low insertion loss, usually below a few decibels.

In addition, double junction isolators also have a wide frequency range and power handling capability. Different isolators can be applied in different frequency bands, such as microwave frequency band (0.3 GHz - 30 GHz) and millimeter wave frequency band (30 GHz - 300 GHz). At the same time, it is able to withstand fairly high power levels, ranging from a few watts to tens of watts.

The design and manufacture of a double junction isolator requires consideration of many factors such as operating frequency range, isolation requirements, insertion loss, size constraints, etc. Typically, engineers use electromagnetic field simulation and optimization methods to determine suitable structures and parameters. The process of manufacturing double-junction isolators usually involves sophisticated machining and assembly techniques to ensure device reliability and performance.

Overall, the double-junction isolator is an important passive device that is widely used in microwave and millimeter wave systems to isolate and protect signals from reflection and mutual interference. It has the characteristics of high isolation, low insertion loss, wide frequency range and high power handling capacity, which has an important impact on the performance and stability of the system. With the continuous development of wireless communication and radar technology, the demand and research of double-junction isolators will continue to expand and deepen.

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