Abstract
A novel, compact microwave tunable bandpass filter integrated power divider, based on the high anisotropy electro-optic nematic liquid crystal, is proposed in this letter. Liquid crystal, as the electro-optic material, is placed between top inverted microstrip line and the metal plate. The proposed structure can realize continuous tunable bandpass response and miniaturization. The proposed design concept is validated by the good performance of simulation results and experimental results. The electro-optic material has shown great potential for microwave application.
Highlights
With the rapid development of modern wireless communication systems, high priority is given to the size, performance, and cost of microwave devices
To reduce connection loss, manufacturing cost, and miniaturize the circuit size, we make filter and power divider cascaded in one device
The current tunable techniques mainly include diode switch, ferrite, ferroelectric substance, and RF microelectromechanical systems (MEMS). Some of their shortcomings variably restrict the development of microwave devices, such as slow tuning speed and large volume of yttrium iron garnet (YIG), poor linearity of barium strontium titanate (BST), lesser tuning ratio and higher cost of RF MEMS, and poor linearity of diode
Summary
With the rapid development of modern wireless communication systems, high priority is given to the size, performance, and cost of microwave devices. The current tunable techniques mainly include diode switch, ferrite, ferroelectric substance, and RF microelectromechanical systems (MEMS) Some of their shortcomings variably restrict the development of microwave devices, such as slow tuning speed and large volume of yttrium iron garnet (YIG), poor linearity of barium strontium titanate (BST), lesser tuning ratio and higher cost of RF MEMS, and poor linearity of diode.. The proposed nematic liquid crystal, as a high anisotropy electro-optic material, can realize the variations in dielectric permittivity, when applied changed bias voltages.. The proposed nematic liquid crystal, as a high anisotropy electro-optic material, can realize the variations in dielectric permittivity, when applied changed bias voltages.6,7 It has a large number of advantages compared to traditional techniques, such as relatively low loss, low operating voltage, and fast tuning at microwave frequencies.
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