فهرست:
II
عنوان صفحه
I چکیده.........................................................................................................
فهرست مطالب............................................................................................... II
فرهنگ اختصارات......................................................................................... IV
فهرست اشکال............................................................................................... V
فصل 1 مشخصات تشعشعی یک آنتن................................................................... 2
1-1) مقدمه .............................................................................................. 2
1-2) تقسیم بندی نواحی اطراف یک آنتن ............................................................... 2
1-3) شدت تشعشعی آنتن....................................................................................3
1-4) نمودارهای تشعشعی.................................................................................. 4
.......................................................................7 HPBW 1-5) پهنای تابه نیم توان
یک آنتن ..........................................................8VSWR 1-6) پهنای باند فرکانسی و
1-7) بهره جهتی آنتن .......................................................................................9
1-8) سمتگرایی .............................................................................................9
1-9) بازده تشعشعی آنتن .................................................................................10
) ............................................................................10g 1-10) بهره یا گین آنتن (
1-11) امپدانس ورودی آنتن .............................................................................11
1- 12) قطبش موج .......................................................................................11
1-13) ضریب کیفیت (Q) در مدارات سری.............................................................12
فصل 2- آنتن های تلفن همراه............................................................................14
2-1) مقدمه...................................................................................................14
2-2) آنتن کوچک چیست ؟ ..............................................................................14
2-3) آنتن F معکوس و عملکرد یک آنتن تلفن همراه ...............................................15
2-4) شاسی در گوشی موبایل ..........................................................................18
2-5) آنتنهای سیمی.......................................................................................18
2-6) موقعیت آنتن در موبایل............................................................................21
2-7) حجم آنتن............................................................................................23
2-8) انواع کلاسهای آنتنهای موبایل...................................................................26
فصل 3 – توصیف کیفی و تحلیل عملکرد آنتن PIFA ..............................................30
3-1) مقدمه................................................................................................30
3-2) تغییرات پورت زمین و تاثیر آن روی آنتن PIFA در گوشی موبایل.......................30
3-3) تحلیل آنتن PIFA با استفاده از مدل های معادل .............................................37
3-4 ) روش تحلیل عملکرد آنتن PIFA در این پژوهش.............................................39
3-5) شبیه سازی یک آنتن مونوپل به کمک نرم افزار HFSS ...................................40
فصل 4 – نحوه طراحی آنتن PIFA در این تحقیق..................................................44
4-1) مقدمه................................................................................................44
4-2) طراحی اولیه آنتن..................................................................................44
4-3) تبدیل آنتن PIFA تک باند به دو باند..........................................................49
4-4) بهینه سازی آنتن طراحی شده....................................................................51
4-5)جمع بندی............................................................................................62
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