Design of a 2.4 GHz ISM band power divider with highly linear small-signal RF Amplifier
Poojari, Bhaskar (2013)
2013
Master's Degree Programme in Electrical Engineering
Tieto- ja sähkötekniikan tiedekunta - Faculty of Computing and Electrical Engineering
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Hyväksymispäivämäärä
2013-10-09
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:tty-201310241391
https://urn.fi/URN:NBN:fi:tty-201310241391
Tiivistelmä
This thesis report presents the design of an ISM 2.4 GHz band power divider with high-ly linear small-signal RF amplifier. The RF amplifier is used for compensating the power loss caused as a result of a division operation. The prototyped power divider is used for the re-design of small-signal board that is utilized in the solid state cooking project with which required RF input signal is generated and supplied to the high power amplifier. With the re-designed small-signal board it is possible to configure the system as a single channel system or multichannel master/slave system. The prototyped power divider has two inputs (LO input and auxiliary input) and three outputs (Out 1, Out 2, and auxiliary output) with an unequal gain between the input and output ports. Although multiple power dividers are available in the market, we aimed to design a low cost power divider by making use of inexpensive components providing high performance. The prototyped power divider has the possibility for the mass production.
The objective of the thesis is to fabricate 3-and 2-way power dividers and highly linear small-signal RF amplifiers as standalone devices and then to realize the final power divider by integration of the dividers and amplifiers. The resistive power divider topology was chosen for the 3-and 2-way power dividers fabrication because of its ad-vantages like, easy to implement, compact, and inexpensive. The specified gain design procedure was followed in the design of the RF amplifiers.
The prototyped 3-and 2-way power dividers have insertion loss of 9.88 dB and 6.26 dB respectively and minimum return loss of 21.7 dB is available in the operating fre-quency band, 2.4-2.5 GHz. The fabricated amplifiers are unconditionally stable up to 18 GHz. The input and output return loss of 17 dB and 10 dB gain amplifiers are 12.5 dB, 21.5 dB and 12.5 dB, 30.5 dB respectively with the power consumption of 66 mW. The gains are 17.2 dB and 11.2 dB, OIP3 of 29 dBm and 18 dBm respectively. The proto-typed power divider has maximum gain between the inputs and Out 1 is 0.4 dB, Out 2 and auxiliary output is 1.24 dB. The return loss at all the input and output ports are above 19 dB. The price of all components is 3.5 euro. The prototyped power divider is good enough for the application.
The objective of the thesis is to fabricate 3-and 2-way power dividers and highly linear small-signal RF amplifiers as standalone devices and then to realize the final power divider by integration of the dividers and amplifiers. The resistive power divider topology was chosen for the 3-and 2-way power dividers fabrication because of its ad-vantages like, easy to implement, compact, and inexpensive. The specified gain design procedure was followed in the design of the RF amplifiers.
The prototyped 3-and 2-way power dividers have insertion loss of 9.88 dB and 6.26 dB respectively and minimum return loss of 21.7 dB is available in the operating fre-quency band, 2.4-2.5 GHz. The fabricated amplifiers are unconditionally stable up to 18 GHz. The input and output return loss of 17 dB and 10 dB gain amplifiers are 12.5 dB, 21.5 dB and 12.5 dB, 30.5 dB respectively with the power consumption of 66 mW. The gains are 17.2 dB and 11.2 dB, OIP3 of 29 dBm and 18 dBm respectively. The proto-typed power divider has maximum gain between the inputs and Out 1 is 0.4 dB, Out 2 and auxiliary output is 1.24 dB. The return loss at all the input and output ports are above 19 dB. The price of all components is 3.5 euro. The prototyped power divider is good enough for the application.