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Expt 7

The document outlines an experiment to measure the resonance characteristics of a Microstrip Ring Resonator and determine the dielectric constant of its substrate. It details the necessary equipment, theoretical background on microstrip technology, and the experimental procedure including frequency variation and data collection. The experiment aims to establish resonance conditions and analyze output power in relation to frequency.

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172 views2 pages

Expt 7

The document outlines an experiment to measure the resonance characteristics of a Microstrip Ring Resonator and determine the dielectric constant of its substrate. It details the necessary equipment, theoretical background on microstrip technology, and the experimental procedure including frequency variation and data collection. The experiment aims to establish resonance conditions and analyze output power in relation to frequency.

Uploaded by

Savitha TELE ENG
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
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Microwave and Antenna Lab

EXPERIMENT No.

AIM: To measure resonance characteristics of Microstrip Ring Resonator and determine


dielectric constant of the substrate.

EQUIPMENTS REQUIRED: power supply, VCO, 50 ohm transmission line, ring


resonator, 50 ohm terminations, and cables with Oscilloscope/VSWR meter/power
meter.

THEORY: Microstrip is a type of electrical transmission line which can be fabricated


using printed circuit board technology, and is used to convey microwave-frequency
signals. It consists of a conducting strip separated from a ground plane by a dielectric
layer known as the substrate. Microwave components such as antennas, couplers, filters,
power dividers etc. The basic configuration, which consists of unidirectional coupling
between a ring resonator with radius r and a waveguide. Defining that a single
unidirectional mode of the resonator is excited, the coupling is lossless, single
polarization is considered, none of the waveguide segments and coupler elements couple
waves of different polarization, the various kinds of losses occurring along the
propagation of microwave. The open-end effect encountered in a rectangular
resonator of the feed long gaps can be minimized by forming the resonator as a closed
off. Such resonator is called as Ring resonator. The Ring resonator find applications in
the design of filters, oscillator and mixers. Resonance is established when the mean
circumference of the ring is equal to integral multiplies of guide wave length.

Where ro = radius of the ring, n = mode number, €eff = effective dielectric constant of
the substrate.

EXPERIMENTAL PROCEDURE: 1. Experiment set up as shown in fig.


2. Keep microwave generator in Internal AM mode.
3. Vary the RF out frequencies at 2.2GHz to 3GHz insteps of 0.1GHz and note down
output detector power in VSWR meter.
4. Note down/ tabulate these results & note down the resonant frequency at which the
output power maximum.
5. Plot the graph output power Vs frequency.
6. Determine dielectric constant of the substrate of Ring Resonator.

Tabular Column:

Freq in G Hz P1 in db without ring P2 in db with ring


resonator resonator
2.2
2.3

3.0

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