GSM The Design of Tri-frequencies Microstrip Antenna for GSM (900/1800/1900-MHz) 2005 5
GSM GSM GSM900 GSM1800 GSM1900 GSM GSM GSM900 GSM1800 GSM1800 GSM1900 GSM 900M 1800M H H E H GSM 120 GSM1800 GSM1900 M
S11 GSM1800-3dB GSM1900-4dB -13dB -15dB GSM1800 GSM1900 GSM900 GSM GSM900 S11 GSM
Abstract Abstract With the increasing developments of the wireless communication, more and more GSM devices are needed, which can work under three frequency bands of GSM(GSM900 GSM1800 GSM1900). So the relevant requirements for antenna, which are the critical parts of wireless communication devices, are also put forward. And this is our aim to study the antenna which can work on three frequency bands of GSM. After advisedly analyzing advanced research areas of our world, we decide to combine double patch technology, which can work on two frequencies, and modern broadband technology to realize the new tri-bands antenna. This antenna is better use of the second harmonic generation characteristic of the GSM900 and GSM1800, and the proximity/overlapping effect of the GSM1800 and GSM1900. This project is made more perfect by emulating radiation patterns and analyzing measured data. For double patch technology, two patches are all printed on one circuit board one is a rectangular patch and the other is a rectangular-ring patch, which are used to radiate the RF signal at 1800MHz and 900MHz. To feed the antenna, the aperture-coupled feed is used. With this feed method, the bandwidth of the antenna can be expanded and the antenna is easier to be matched. This coupled part is printed on another circuit board, and these two circuit boards are spaced out with foam. H-shaped coupling slots are cut in the antenna s ground plane to couple the electromagnetic energy from the feed network in the two radiating patches. The feed network is designed not only to feed antenna but also to make antenna matched. The measured E plane and H plane radiation patterns show that the amplitude of the antenna emission is
enough on all three frequency bands, and the emission keeps about 120 radiation angle. Thus, all these make sure the project. To make the antenna matched at GSM1900, an external matching circuit is needed. A kind of LC matching network is selected to match this antenna, since it is easy design and low cost. After being matched by this network, the measured return losses drop from -3dB and -4dB to -13dB and -15dB, on GSM1800 and GSM1900 bands, respectively. With this innovation design on microstrip antenna, its final properties can quietly fit the requirements for GSM. Certainly, there is still some further work to be done on resonance property of GSM900 in the near future. Key words: Microstrip antenna, Tri-frequencies, Broadband technology, GSM, Aperture-coupled feed, Matching network
3. 1. 4...25 3. 2...31 3. 2. 1 Microwave Office...32...1 1.1...1...3 1.2...2 2. 1...3 2. 2...4 2. 3...5 2. 4...6 2. 4. 1...8 2. 4. 2...9 2. 4. 3...11 2. 5...12 2. 5. 1...12 2. 5. 2...14 2. 5. 3...16 2. 5. 4...16...18 2. 6...17 3. 1...18 3. 1. 1...19 3. 1. 2...21 3. 1. 3...23
3. 2. 2...33...40 3. 3...39 4. 1...40 4. 2...42 4. 2. 1 OATS Open area test site...43 4. 2. 2...44 4. 3...44 4. 3. 1...44 4. 3. 2...51 4. 3. 3...58 4. 3. 4...60 4. 4...61...64 4. 5...62 5. 1...64 5. 2...66 5. 2. 1...67 5. 2. 2...68 5. 3...72...73...75...79...80...81...82
Table of Contents Table of Contents Chapter 1 Foreword...1 Background of the subject and its significance...1 Main works of the article...2 Chapter 2 The theory of Microstrip Antenna...3 2.1 Summary...3 2.2 The configuration and sorts of Microstrip Antenna...4 2.3 The capability and applications of Microstrip Antenna...5 2.4 The theory analyse of Microstrip Antenna...6 2.4.1 The method of Transmission line analyze...8 2.4.2 The method of Moldcavity...9 2.4.3 The method of Integral equation analyze...11 2.5 The devolpment of Microstrip Antenna...12 2.5.1 Multi-frequencies technology...12 2.5.2 Broadband technology...14 2.5.3 Circle polarization technology...16 2.5.4 High gain technology...16 2.6 Sum-up of this chapter...17 Chapter 3 The design and simulation of the tri-frequencies Microstrip Antenna...18 3.1 The design of the tri-frequencies Microstrip Antenna...18 3.1.1 The choice of the substruct of Microstrip Antenna...19 3.1.2 The design method of single rectangle patch...21 3.1.3 The design method of double rectangle patch...23 3.1.4 Aperture-coupled feed...25 3.2 The simulation of the tri-frequencies Microstrip Antenna...31
3.2.1 Introduce of Microwave Office...32 3.2.2 The simulation design of Microstrip Antenna...33 3.3 Sum-up of this chapter...39 Chapter 4 The measure and analyze of the tri-frequencies Microstrip Antenna... 40 4.1 Manufacture of the microstrip antenna...40 4.2 Measure system for the microstrip antenna...42 4.2.1 OATS Open area test site...43 4.2.2 Measure distance...44 4.3 Analyze of the measured data...44 4.3.1 Radiation patterns...44 4.3.2 Radiation patterns for different couple distance...51 4.3.3 Frequency response of the Microstrip antenna...58 4.3.4 Input return losses...60 4.4 Error analyze...61 4.5 Sum-up of this chapter...62 Chapter 5 The design of matching network for Microstrip Antenna...64 5.1 The action and sorts of matching network...64 5.2 The design of the matching network for tri-frequencies microstrip antenna...66 5.2.1 Program method...67 5.2.2 Simulation by Microwave Office...68 5.3 Sum-up of this chapter...72 Chapter 6 Conclusion and expectation...73 References...75 Acknowledgement...79
1.1 90 GSM GSM900 GSM1800 DCS GSM1900 PCS GSM900 GSM1800 GSM 900M 1800M GSM 1
1 GSM 2 Microwave Office 3 4 5 S11 GSM S11 1.2 2
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1970 Howell Munson 2. 2 4
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2. 4 2 1 2 2 L W λ λ W L h h<< 0 W 0 W λ g /, λg L= 2 2 1 2 2 6
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