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Magic Tee As An Isolator

This document outlines an experiment to study the application of a magic tee as an isolator. The experiment aims to understand isolators, the construction and S-parameters of magic tees, and how magic tees can be used as isolators. It describes the experimental setup, which includes a klystron power supply, klystron tube, magic tee, and other microwave components. Measurements were taken with the magic tee to calculate the isolation coefficient and demonstrate that it was below -15dB, showing the magic tee was successfully functioning as an isolator. The conclusions state that magic tees can be used as isolators and describe the key aspects of how an E-H plane junction magic tee works.

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344 views7 pages

Magic Tee As An Isolator

This document outlines an experiment to study the application of a magic tee as an isolator. The experiment aims to understand isolators, the construction and S-parameters of magic tees, and how magic tees can be used as isolators. It describes the experimental setup, which includes a klystron power supply, klystron tube, magic tee, and other microwave components. Measurements were taken with the magic tee to calculate the isolation coefficient and demonstrate that it was below -15dB, showing the magic tee was successfully functioning as an isolator. The conclusions state that magic tees can be used as isolators and describe the key aspects of how an E-H plane junction magic tee works.

Uploaded by

kr
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Department of Electronics and Telecommunication Engineering

NAME: Krittika Roy DATE:


CLASS: BE E-21 SAP ID: 60002190056

STUDY APPLICATION OF MAGIC TEE AS AN ISOLATOR


AIM : Study application of magic Tee as an Isolator.

APPARATUS :
Klystron Power Supply, Klystron tube, Klystron mount, Isolator, Variable attenuator,
Frequency-Meter, Wave-meter, Match termination, Detector mount, probe, magic tee,etc.

Learning Objective:
1) To know the difference between low frequency and high frequency Measurement
Techniques.
2) To study magic Tee.
3) To study application of magic tee as an Isolator.

THEORY :
1. What is an Isolator?

Semester: VII/ EXTC DJ19ECL702 Microwave Engineering Laboratory


Department of Electronics and Telecommunication Engineering

2. Construction, S-parameters derivation and various applications of Magic


Tee.

Semester: VII/ EXTC DJ19ECL702 Microwave Engineering Laboratory


Department of Electronics and Telecommunication Engineering

3. Detailed explanation about how magic Tee can be used as an “Isolator”.

Semester: VII/ EXTC DJ19ECL702 Microwave Engineering Laboratory


Department of Electronics and Telecommunication Engineering

4. Description of an Experimental set-up

5. Bench Set-up

Semester: VII/ EXTC DJ19ECL702 Microwave Engineering Laboratory


Department of Electronics and Telecommunication Engineering

Semester: VII/ EXTC DJ19ECL702 Microwave Engineering Laboratory


Department of Electronics and Telecommunication Engineering

Calculations :

Observation Table:
Incident voltage at H-Arm = 1V = Vin
Voltage across output at E-arm when Port-1and Port-2 are terminated with perfect match=2mV

=Vout
Isolation Coefficient(dB)= 20 log (Vout/Vin) = -53.9794 dB < -15 dB
Incident voltage at E-Arm= 1V = Vin
Voltage across output at H-arm when Port-1and Port-2 are terminated with perfect match= 2mV

=Vout
Isolation Coefficient(dB)= 20 log (Vout/Vin) = -53.9794 dB < -15 dB

Result:
Isolation Coefficient (dB)= -53.9794 dB

Conclusions:
 In this experiment, applications of Magic tee as an isolator were studied. The junction
where all the four ports are perfectly matched is called as Magic Tee Junction.
 An E-H Plane Tee junction is formed by attaching two simple waveguides
one parallel and the other series, to a rectangular waveguide which already
has two ports. This is also called as Magic Tee, or Hybrid or 3dB coupler.
 E-H Plane junction is used to measure the impedance − A null detector is connected to E-
Arm port while the Microwave source is connected to H-Arm port. The collinear ports
together with these ports make a bridge and the impedance measurement is done by
Semester: VII/ EXTC DJ19ECL702 Microwave Engineering Laboratory
Department of Electronics and Telecommunication Engineering
balancing the bridge.

Semester: VII/ EXTC DJ19ECL702 Microwave Engineering Laboratory

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