Based on the theory of multi-hole waveguide directional couplers, an X-band multi-hole directional coupler with a folded substrate-integrated waveguide has been designed and fabricated. Simulation results show that the ...

In this study an improved model of small metallic post has been used in finite-difference time-domain (FDTD) method. This model has the advantages of wide range stability for different values of post radius, good accuracy ...

This paper presents a broadband four way substrate integrated waveguide power divider with simple and planar feed structure. The proposed power divider has a wide impedancebandwidth of 40% from 4.5GHz to 6.8 GHz. Variation ...

This paper presents a wideband hybrid branch line coupler for millimeter wave applications. The proposed coupler is based on SIW technology and hence has a planar structure. CST microwave studio software is used to simulate ...

در این تحقیق یک مقسم توان کوچک و پهن باند با استفاده از موجبر مجتمع با زیر لایه طراحی می شود.

در این مقاله روش FDTD برای تحلیل و طراحی یک کوپلر موجبری مورد بررسی قرار می گیرد. به منظور انطباق بهتر نتایج FDTD و CST روشی برای مدل سازی میله های فلزی با شعاع کوچکتر از ابعاد مش پیشنهاد می شود. مقایسه روش پیشنهادی با روش ...

A novel compact and ultra wideband antenna with a

printed monopole structure is presented in this article. It is demonstrated

that with a modified-shape ground plane, an ultra wide bandwidth

can be ...

This paper presents a small size ultra wide band antenna for wireless body area network applications. The

proposed antenna covers the impedance bandwidth of 3.1 to 10.6 GHz in free space. The gain reduction is the ...

در این تحقیق ابتدا یک آنتن فرا پهن باند مسطح با ابعاد کوچک طراحی می شود. آنتن طراحی شده یک تک قطبی دایره ای شکل است که برای کاهش ابعاد آن از ساختار زمین بهبود یافته استفاده شده است. در ادامه با اضافه کردن یک ساختار تشدید ...

This article presents a new frequency band notch ultra wideband antenna with compact dimensions. It is shown that with a modified ground plane we can reduce the antenna dimensions without affecting the antenna bandwidth. ...