Reconfigurable Low Profile Antenna

James Soon

Advisor: Dr. Prasad Shastry

Topics Introduction Inputs/Outputs Modes of Operation Methods Diagrams Equipment List Schedule

Why reconfigurable antennas? Cost Reliability

Cost One is cheaper than two

Reliability Two are better than one

Diversity Time Space Frequency Polarization

Project objectives Design Simulation Manufacture Analysis

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P I N D io d e

I n p u t/O u tp u t

Single port frequency diverse device

/2Ho r izo n ta l

P o lar iza tio nI n p u t/O u tp u t

Ver tic a lP o lar iza tio n

I n p u t/O u tp u t

Dual port polarization diverse device

Modes of Operation

Transmit mode Applied rf signal converted to radiated signal

Receive mode Radiated signal converted to received rf signal

Microstrip construction

Microstrip antennas

Coplanar waveguide construction

Radiation characteristics

Research

Several antenna research articles

SUNG, Y.J., JANG, T.U., KIM, Y.S., ‘A Reconfigurable Antenna for Switchable Polarization, IEEE Microwave and Wireless Letters, Volume 14, Number 11, November 2004, pp. 534 - 536.

Antenna with switchable polarization

Diode 1 Diode 2 Diode 3 Diode 4 Polarization

Ant 1 ON ON ON ON Linear

Ant 2 Off Off Off Off Linear

Ant 3 ON Off ON Off LHCP

Ant 4 Off ON Off ON RHCP

Undetermined Design Characteristics Antenna construction

Coplanar Microstrip

Antenna feed structure Microstrip line Probe

Diode biasing Independent Single point

Data sheet

Gain > 5dBi Frequency Range: 1.5 – 1.6 GHz range Return Loss < -15 dB Radiation pattern Polarization: Linear, RHCP, LHCP Bandwidth: approx. 2% VSWR 2.0:1

Methods

CAD tools - SONNET, PCAAD, ADS, Momentum

Microwave Integrated Circuit Fab Lab Network Analyzer, Aneochoic Chamber Labview, VEE Pro

Equipment List

PIN diodes Varactor diodes Fabrication lab Anechoic chamber

Schedule

RF Labs Jan 1 Get Married Jan 8 Honeymoon Jan 22 - 30 Preliminary Design Feb 26 Fabrication Mar 19 Analysis Apr 9 Presentation & Final Report May 3

Questions?