فیلتر میان‌گذر پنجره القایی با استفاده از تکنولوژی زیرلایه مجتمع موجبری برای کاربردهای WLAN
محورهای موضوعی : پردازش چند رسانه ای، سیستمهای ارتباطی، سیستمهای هوشمند
مهدی جلالی
1
*
,
رضا خواجه محمدلو
2
1 - استادیار، گروه برق، واحد نقده، دانشگاه آزاد اسلامی، نقده، ایران
2 - استادیار، گروه برق، واحد میاندوآب، دانشگاه آزاد اسلامی، میاندوآب، ایران
کلید واژه: فیلتر میان گذر, خط انتقال گذار, افت برگشتی, پنجره القایی, زیرلایه مجتمع موجبری,
چکیده مقاله :
در این مقاله، یک فیلتر میان‌گذر پنجره القایی 5/5 گیگاهرتز با استفاده از مبانی ساختار موجبری SIW بر روی زیر لایه FR4 برای کاربرد در باند WLAN معرفی شده است. این فیلتر همراه با خط میکرواستریپ پله‌ای گذار برای اتصال موجبر به خط میکرواستریپ 50 اهم دارای افت برگشتی (S11) کمتر از 10- دسی‌بل دارای پهنای باند 700 مگاهرتز و افت انتقال (S21) پایین است که 98 درصد باند کاربردی WLAN را پوشش می‌دهد. پارامترهای فیلتر با استفاده از پنجره القایی با مدل کردن به صورت شبکه T و روش تبدیل معکوس K حاصل می‌شوند. فیلتر میان‌گذر پنجره القایی با استفاده از نرم افزار HFSS مورد تحلیل قرار گرفته که افت برگشتی 25 دسی‌بل و پهنای باندی مناسب بدست آمده است. فیلتر پیشنهادی در این مقاله دارای وزن کم، حجم و هزینه ساخت آن بسیار کم است و در بسیاری از سیستمهای ارتباطی و مایکروویوی قابل پیاده‌سازی و مجتمع‌سازی هست.
In this article, a 5.5 GHz inductive window filter based on SIW waveguide structure on FR4 substrate is introduced for use in the WLAN band. This filter, together with the transition step microstrip line for connecting the waveguide to the 50-ohm microstrip line, has a return loss (S11) of less than -10 dB, a bandwidth of 700 MHz, and a low transmission loss (S21), which is 98% of the WLAN application band. covers The parameters of the filter are obtained by using the induction window by modeling in the form of a T network and the K inverse transformation method. The induction window intermediate filter has been analyzed using HFSS software, and the return loss of 25 dB and suitable bandwidth have been obtained. The filter proposed in this article is light in weight and volume, and the cost of its construction is very low and can be implemented and integrated into many communication and microwave systems.
Introduction: Filters are widely used in modern telecommunication systems and satellites. The general requirements for these filters are low loss, high power transmission, small size, and high trace bandwidth with low implementation cost. Compared to flat transmission lines, rectangular waveguides have low loss and high-quality factors. Despite this high cost and the difficulty of using them in plate circuits prevent their use in low-cost and high-size users. Recently, a new concept of integrated waveguide substrate (SIW) has been proposed. Many telecommunications devices such as antennas, power dividers, filters, and separators have been reported based on the integrated waveguide technology. This technology is a suitable choice for the design of microwave and millimeter wave filters, which provide a low profile, the ability to be implemented on cheap printed circuit boards, and low weight with good performance.
Method: A fourth-order filter with a bandwidth of about 700 MHz at a central frequency of 5.5 GHz is designed in this section. The usual method for calculating the length and width of each induction window cavity is as follows: 1- Obtaining the dimensions of conventional rectangular waveguide and SIW waveguide 2- Modeling each induction window cavity as a T network using Marcuvitz theory to calculate the reactance and susceptance of the T network 3- Convert T network to K inverter
Results: A four-order SIW induction window filter with a transition line at a center frequency of 5.5 GHz was designed and demonstrated. The designed filter has a return loss and an adjustable loss in the WLAN application band. And it is easily integrated with microstrip circuits. The filter in the WLAN band has a smooth transmission coefficient with -8 dB loss.
Discussion: It can be seen from the figure that the return loss of the filter in the WLAN band is in the range of -10 to -28 dB and the transmission coefficient in 80% of the WLAN band has a smooth response and in the rest with an acceptable transmission coefficient.
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