Frequency-Tunable and Pattern Diversity Antennas for Cognitive Radio Applications
International Journal of Antennas and Propagation, 2014 Frequency-tunable microstrip antennas, for cognitive radio applications, are proposed herein. The approach is based on tuning the operating frequency of a bandpass filter that is incorporated into a wideband antenna.
A. H. Ramadan +4 more
doaj +1 more source
Versatile Tunable Voltage-Mode Biquadratic Filter and Its Application in Quadrature Oscillator
Sensors, 2019 This paper presents a versatile tunable voltage-mode biquadratic filter with five inputs and three outputs. The proposed filter enjoys five single-ended output operational transconductance amplifiers (OTAs) and two grounded capacitors.
San-Fu Wang +3 more
doaj +1 more source
Bandpass Filter With Tunable/Switchable In-Band Interference Rejection
IEEE Microwave and Wireless Components Letters, 2021 This letter presents a wideband bandpass filter (BPF) with a tunable and switchable in-band notch. This allows the RF front end to pass the signal of interest uninterrupted in the absence of an in-band interferer and reject part of the passband in case a
M. A. Khater +5 more
semanticscholar +1 more source
Distortion mechanisms in varactor diode-tuned microwave filters [PDF]
, 2006 This paper examines the broadband distortion behavior in flexible filters employing varactor-diode tuning elements. Series- and parallel-resonant varactor-loaded transmission-lines, both commonly used in bandpass and bandstop microwave filters, are ...
Carey-Smith, BE, Warr, PA
core +2 more sources
Small Size Dual-band Bandpass Filters with Multiconductor Transmission Lines and Shunt Open Stubs [PDF]
, 2018 A dual-band bandpass filter consisting of multiconductor transmission lines (MTL) and shunt stubs has been designed. The used topology, based on the interconnection of two identical MTL and a shunt open stub, has a frequency response that can be modelled
Márquez Segura, Enrique +2 more
core +1 more source
Wide tuning-range planar filters using lumped-distributed coupled resonators [PDF]
, 2005 This paper describes a discretely tunable filter topology based on lumped-distributed coupled transmission lines, particularly suitable for microelectromechanical systems switching devices.
Beach, MA +3 more
core +2 more sources
A CMOS Q-Enhancement Bandpass-Filter For Use In Paging Receivers [PDF]
, 1998 Paging receivers often have to work in a dense\ud signal environment. This poses high demands on the preselection\ud filter. One of the most difficult aspects is the large\ud image rejection demand, which only can be satisfied by use\ud of a narrow-band ...
Eikenbroek, J.W.Th. +3 more
core +8 more sources
High Selectivity Dual-Band Bandpass Filter with Tunable Lower Passband
International Journal of Antennas and Propagation, 2015 This paper presents a novel method to design dual-band bandpass filters with tunable lower passband and fixed upper passband. It utilizes a trimode resonator with three controllable resonant modes. Discriminating coupling is used to suppress the unwanted
Wei-Qiang Pan +3 more
doaj +1 more source
Continuously Tunable Microwave Photonic Notch Filter With a Complex Coefficient
IEEE Photonics Journal, 2011 This paper presents a continuously tunable microwave photonic notch filter with a complex coefficient. The complex coefficient is generated using a radio-frequency (RF) phase shifter that consists of a dual-parallel Mach-Zehnder modulator (DPMZM) and a ...
Wei Li, Ning Hua Zhu, Li Xian Wang
doaj +1 more source
High-Q High Power Tunable Filters Manufactured With Injection Molding Technology
IEEE Access, 2022 This paper presents the first demonstration of injection molding technology to enable large-scale mass manufacturing of high-performance tunable microwave filters to meet the growing needs of 5G small cell stations.
Michael D. Sinanis +4 more
doaj +1 more source