فهرست مطالب

عنوان                                                                                                              صفحه

فصل اول                                                                                              1

مباني آنتن انواع و پارامترهاي آن                                                                  1

2_1: تاريخچه                                                                                         2

2_2: انواع آنتن ها از نظر كاربرد                                                                              4

الف) آنتن هرتز                                                                                        4

ب) آنتن ماركني                                                                                       4

پ) آنتن شلاقي                                                                                                 5

ت ) آنتن لوزي ( روبيك)                                                                             5

ث) آنتن V معكوس                                                                                  5

ج) آنتن ماکروويو                                                                                      8

چ) آنتن آستيني                                                                                                9

ح) آنتن حلزوني                                                                                       9

ذ) آنتن هاي آرايه اي ARRAY ANTENNA                                               10

2-3 : پارامترهاي آنتن                                                                                11

نمودار پرتو افکني آنتن ها                                                                            11

دستگاه مختصات نمايش نمودار پرتو افکني                                                         11

نمودار پرتو افکني سه بعدي و دو بعدي                                                             12

نمودار پرتو افکني درفضاي آزاد و در مجاورت زمين                                               15

نمودار پرتو افکني آنتن فرستنده و گيرنده                                                                   15

جهت دهندگي آنتن ها                                                                               16

پهناي شعاع و پهناي شعاع نيم توان                                                                 16

شعاع هاي فرعي آنتن ها                                                                                       17

مقاومت پرتو افكني  آنتن                                                                                      18

امپدانس ورودي آنتن                                                                                 18

سطح موثر يا سطح گيرنده آنتن ها                                                                  19

طول موثر آنتن                                                                                        20

پهناي نوار فركانس آنتن ها                                                                           20

پلاريزاسيون آنتن ها                                                                                  21

پلاريزاسيون خطي                                                                                     22

پلاريزاسيون دایره ای                                                                                           23                                                                                                          

پلاريزاسيون بيضوي                                                                                   23

ساختمان مكانيكي آنتن ها                                                                           24

اندازه آنتن                                                                                             24

نصب آنتن ها                                                                                           24

خطوط انتقال و موج برها براي تغذيه آنتن ها                                                      25

رسانا  و نارساناهاي مورد استفاده در ساختن آنتن ها                                              26

محافظت آنتن در برابر عوامل جوي                                                                  27

فصل دوم                                                                                                                   28

شبکه های کامپیوتری شبکه های بی سیم                                                       28

2-1:سخت افزار شبکه                                                                                29

2-1-1: شبکه های ﭘخشي(broadcast network)                                            30

2-1-2: شبکه های همتا به همتا (peer-to-peer network)                               30

2-1-3:شبکه های شخصی (personal area network)                                              30

2-1-4:شبکه های محلی (local area network)                                             30

2-1-5:شبکة شهری(Mtropolitan  Area Network)                                              32

2-1-6:شبکة گسترده (Wide Area Network)                                              32

2-1-7:شبکة بی سيم (wireless network)                                                   34

2-1-8:شبکة شبکه ها (internetwork)                                                                  35

2-2: نرم افزار شبکه                                                                                  35

2-2-1:لاية فيزيکی (Physical layer)                                                          39

2-2-2: زير لاية نظارت بر دسترسی به رسانة انتقال ( MAC)                                  39

2-2-3:لاية شبکه                                                                                     40

2-2-4:لاية انتقال(Transport layer)                                                          40

2-2-5:لاية کاربرد (Application layer)                                                      40

2-3: شبکه های محلی بی سيم (802.11)                                                         41

2-3-1: ﭘشتة ﭘروتکل 802.11                                                                       42

2-3-2: لاية فيزيکی در 802.11                                                                              42

2-4: شبکه های بی سيم باند گسترده                                                              44

2-4-1: لاية فيزيکی در 802.16                                                                              45

فصل سوم                                                                                                                  48

آنتن هاي هوشمند                                                                                                      48

 بخش اول                                                                                                                    49

آنتن هاي هوشمند در شبکه هاي بي سيم                                                       49

تداخل هم کانال                                                                                       50

اثرات محوشدگي                                                                                                50

4_الف_1: جوانب تکنولوژي سيستم آنتن هوشمند                                                        53

4- الف - 2: مدلهاي کانال                                                                            55

4-الف-2-1:مدل لي Lee s Model                                                              55

4-الف- 2-2: A Model of Discreteiy Didposed , Uniform set Of Evenly

Spread scatterers                                                                              56

4- الف-2-3: مدل ماکروسل (