en 5-Microwave Passive Circuits Microwave Passive Circuits Research Paper Research Paper <div style="text-align: justify;"><span style="color:#000000;"><span style="font-size:14px;"><span style="font-family:times new roman;">A novel dual-band bandpass filter (DB-BPF) with controllable parameters in design process and a compact structure is introduced in this paper. The total structure includes open-circuited and short circuited coupled-lines, leading to a compact circuit. The resonance frequencies, insertion loss and quality factor can be independently controlled by adjusting the coupled lines. In order to eliminate the magnetic and electric coupling effects, the virtual grounds are placed in coupled complementary hairpin resonator. To verify the validity of the design approach, a DB-BPF centring, at 3.5 and 5 GHz with respective insertion losses of 0.7 and 0.58dB for WIMAX (IEEE 802.16 band) and WLAN (IEEE&nbsp;802.11&nbsp;band) applications has been designed and fabricated, whose the measured results confirm the electromagnetic simulation.</span></span></span></div> Micro-Strip Bandpass Filter,Coupled Complementary Hairpin Resonator (C CHR),Admittance Analysis,Two-Band,WLAN Systems,WiMAX Systems, 324 329 http://ijeee.iust.ac.ir/browse.php?a_code=A-10-148-4&slc_lang=en&sid=1 F. Khamin Hamedani farnazkhamin@gmail.com 180031947532846007031 180031947532846007031 No Department of Electronic, College of Engineering, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran. Gh. Karimi ghkarimi@razi.ac.ir 180031947532846007032 180031947532846007032 Yes Department of Electrical, Faculty of Engineering, Razi University, Kermanshah, Iran.