Abstract
A novel single-ended-to-balanced (SETB) filtering circuit is proposed in this paper. The proposed circuit not only integrate controllable working modes between SETB filtering and SETB filtering power dividing (FPD) into one unit, but also has multi-level reconfigurable capabilities including tunable center frequencies, bandwidths, and switchable single/dual-band operations. It is constructed by a 5-port symmetrical microstrip network. By properly engineering the transmission response of the even and odd mode of the proposed circuit, the multiple reconfigurable functions can be realized in just one circuit in a mathematically sound way. The working modes between SETB filtering and SETB FPD are switched by leaving the corresponding ports open, while the control of center frequency, bandwidth, and single/dual-band operation is realized by tuning the capacitance value of loaded varactors. Detailed theoretical and experiment results have been given with good agreement.
Highlights
Baluns and bandpass filters are essential components in the modern communication system
By manipulating the coupling coefficient between resonators and leaving the unused port open-circuited, the proposed circuit can work in four reconfigurable modes including single-band balun filtering mode, dual-band balun filtering mode, single band SETB filtering power dividing (FPD) mode, and dual-band SETB FPD mode
To make the circuit working in dual-band SETB FPD mode, the coupling coefficients are made to be =, and = - ; To switch the circuit to single-band SETB FPD mode, the coupling coefficients are made to be =, and =
Summary
Baluns and bandpass filters are essential components in the modern communication system. In this downconverter, the SETB FPD after the low noise amplifier (LNA) integrates the functions of balun, filter and differential power divider, and generates two pairs of differential signals to the mixers, resulting in a compact size and low-cost. Antenna beams with very low cross-polarization level were obtained All these designs have realized single-to-balanced power divider functions with good common-mode rejection. The design integrates controllable working modes between SETB filtering and SETB FPD into one unit, and has multi-level reconfigurable capabilities including tunable center frequencies and bandwidths, switchable single/dual-band operations. Microstrip prototype is manufactured and measured, the measured results agree well with the simulation results
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