Chapt14

Chapt14 - EEE 443 Antennas for Wireless Communications by...

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1 Copyright©2007 by Constantine A. Balanis All rights reserved Chapter 14 Microstrip Antennas EEE 443 Antennas for Wireless Communications by Constantine A. Balanis Lecture #24 Copyright©2007 by Constantine A. Balanis All rights reserved Chapter 14 Microstrip Antennas Chapter 14 Microstrip Antennas Copyright©2007 by Constantine A. Balanis All rights reserved Chapter 14 Microstrip Antennas 14 Microstrip Antennas Chapter 14.1 14.2 14.3 14.4 , 14.5 14.6 14.7 14.8 Introduction Rectangular Patch Circular Path Quality Factor Bandwidth and Efficiency Input Impedance Coupling Circular Polarization Arrays and Feed Networks Copyright©2007 by Constantine A. Balanis All rights reserved Chapter 14 Microstrip Antennas Microstrip (Patch) Antenna A metallic strip or patch mounted on a dielectric layer (substrate) which is supported by a ground plane Copyright©2007 by Constantine A. Balanis All rights reserved Chapter 14 Microstrip Antennas Rectangular Microstrip Antenna Fig. 14.1a Copyright©2007 by Constantine A. Balanis All rights reserved Chapter 14 Microstrip Antennas Side View Fig. 14.1b
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2 Copyright©2007 by Constantine A. Balanis All rights reserved Chapter 14 Microstrip Antennas Coordinate System For Each Radiating Slot Z Fig. 14.1c Copyright©2007 by Constantine A. Balanis All rights reserved Chapter 14 Microstrip Antennas Fig. 14.2 Patch Geometries Copyright©2007 by Constantine A. Balanis All rights reserved Chapter 14 Microstrip Antennas Rectangular Microstrip ( L = 0.906 cm, W = 1.186 cm, h = 0.1588 cm, y o = 0.3126 cm, ε r = 2.2, f = 10 GHz) Fig. 14.8 (a) Copyright©2007 by Constantine A. Balanis All rights reserved Chapter 14 Microstrip Antennas Circular Microstrip ( a = 0.525 cm, a e = 0.598 cm, h = 0.1588 cm, ρ f = 0.1 cm, r = 2.2, f = 10 GHz) Fig. 14.8 (b) Copyright©2007 by Constantine A. Balanis All rights reserved Chapter 14 Microstrip Antennas Microstrip Array (10 x 10) (Space-to-Space Communication: f = 2 – 2.3 GHz. Courtesy: Ball Aerospace & Technologies Corporation) Fig. 14.38 Copyright©2007 by Constantine A. Balanis All rights reserved Chapter 14 Microstrip Antennas Microstrip (Patch) Antennas Advantages: 1. Low profile 2. Conformable to nonplanar surfaces 3. Simple and inexpensive 4. Mechanically robust 5. Compatible with MMIC designs 6. Very versatile a. Resonant frequency b. Polarization c. Patterns d. Impedance
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3 Copyright©2007 by Constantine A. Balanis All rights reserved Chapter 14 Microstrip Antennas Disadvantages 1. Low power 2. Narrow bandwidth 3. Large EM signature at certain frequencies outside operating band 4. In large arrays, tradeoff between bandwidth and scan volume 5. Large size (physical) at VHF and possibly UHF bands Copyright©2007 by Constantine A. Balanis All rights reserved Chapter 14 Microstrip Antennas Popular Feed Techniques 1. Microstrip line 2. Probe (coaxial) 3. Aperture coupling 4. Proximity coupling Copyright©2007 by Constantine A. Balanis All rights reserved Chapter 14 Microstrip Antennas Microstrip Feed Line Microstrip Feed Line Fig. 14.3a Copyright©2007 by Constantine A. Balanis All rights reserved Chapter 14 Microstrip Antennas Coaxial Feed Line Fig. 14.3b Copyright©2007 by Constantine A. Balanis All rights reserved Chapter 14 Microstrip Antennas
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This note was uploaded on 11/01/2009 for the course EEE 443 taught by Professor Balanis during the Spring '08 term at ASU.

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Chapt14 - EEE 443 Antennas for Wireless Communications by...

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