Frequency-band-switchable switch band-pass filter based on RF MEMS technology

• Main Authors: WANG CHUNTING, MEI LIRONG, ZHANG NAIBAI
• Format: Patent
• Language: English
• Published: 28.01.2015
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE; WAVEGUIDES

The invention provides a switch-switchable band-pass filter based on the RF MEMS technology, and belongs to the field of micro-electronics mechanical systems. The switch-switchable band-pass filter based on the RF MEMS technology comprises two band-pass filters and four RF MEMS switches. When the two switches on the same path are closed, signals pass through the band-pass filter on the path. The band-pass filter designed through the RF MEMS switches has the integration feature; if PIN or FET switches are adopted for the design, the overall packaging of the band-pass filter is difficult to realize, and integration is difficult to implement. The band-pass filter has feature that the switches have high isolation, and the adopted RF MEMS switches can realize the isolation of over 30 dB at the C-X wave band. The switch-switchable band-pass filter has the advantages of being simple in structure and high in reliability, and compared with digital-tunable and analog-tunable RF MEMS filters, the switch-switchable band-pass filter has the advantages that the capacitance ratios of the switches do not need to be considered, the design structure is simple, the number of switches used is small, and the reliability is higher.