Impedance matching circuit for 30?88MHz monopole antenna with automatic matching

Author

Akhmadanna Pradipta Putra;Achmad Munir

Author_Institution

Radio Telecommunication and Microwave Laboratory, School of Electrical Engineering and Informatics, ITB, Bandung, Indonesia

fYear

2015

Firstpage

1

Lastpage

4

Abstract

This paper presents an impedance matching circuit for monopole antenna in the frequency range 30-88MHz which is integrated by microcontroller with tuning algorithm as an automation component. An impedance matching type L is used for the circuit, while for the realization some trimmer capacitors and SMD inductors are employed. To get an input voltage for the microcontroller, some supporting circuits are designed including VSWR meter, comparator and amplifier with 2 levels. It shows that the circuit is successfully tested by replacing values of load impedance with ZA = 75 + 14.6952j and ZB = 75 + 25.6224j, and tuning frequency values in frequency range of 41-45MHz. When impedance matching circuit is active, VSWR values for load impedance ZA = 75 + 14.6952j in the frequency 41MHz, 43MHz, and 45MHz are 1.34, 1.35 and 1.5, respectively and for load impedance ZB = 75 + 25.6224j are 1.37, 1.373 and 1.5.

Keywords

"Impedance matching","Impedance","Microcontrollers","Microwave antennas","Microwave amplifiers","Microwave circuits","Radio transmitters"

Publisher

ieee

Conference_Titel

Wireless and Telematics (ICWT), 2015 1st International Conference on

Print_ISBN

978-1-4673-8433-9

Type

conf

DOI

10.1109/ICWT.2015.7449247

Filename

7449247