Title :
Dual-Band BPF Composed of Doubly-Coupled λ/2 and λ/4 SIRs for WLAN Applications
Author :
Ho, Haohung ; Ho, Minhua ; Hong, Wanchu
Author_Institution :
Electron. Eng. Dept., Nat. Changhua Univ. of Educ., Changhua
Abstract :
This paper presents a dual-band bandpass filter composed of lambda/2 and lambda/4 stepped impedance resonators (SIRs) for the WLAN applications. The filter covers both the operating frequencies of 2.45 and 5.2 GHz. The doubly parallel-coupling mechanism is used in the filter design to provide alternative routes for signals of distinct frequencies. The tapped-line I/O feed is adopted in this circuit to create the attenuation poles for improving the signal selectivity and stopband rejection levels. Experiments are conducted to verify the circuit performance.
Keywords :
band-pass filters; microstrip filters; microwave filters; resonator filters; wireless LAN; WLAN applications; coupled microstrip lines; doubly parallel-coupling mechanism; doubly-coupled SIR; dual-band BPF; dual-band bandpass filter; filter design; frequency 2.45 GHz; frequency 5.2 GHz; signal selectivity; stepped impedance resonator; stopband rejection level; tapped-line I/O feed; Attenuation; Band pass filters; Circuits; Dual band; Feeds; Frequency; Impedance; Resonator filters; Signal design; Wireless LAN;
Conference_Titel :
Microwave Conference, 2008 China-Japan Joint
Conference_Location :
Shanghai
Print_ISBN :
978-1-4244-3821-1
DOI :
10.1109/CJMW.2008.4772482
