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Ferroelectric thin-membrane phase shifter, detection and optimization for reflection characteristics

A ferroelectric thin film and phase shifter technology, which is applied in phase shifting networks, circuits, electrical components, etc., can solve the problems of strong reflection loss and deterioration of transmission loss, and achieve the goal of reducing reflection loss, improving quality factor, and improving transmission characteristics Effect

Active Publication Date: 2006-05-31
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, in this single-period loading ferroelectric adjustable capacitor structure, as the frequency increases, the reflection loss becomes stronger and the corresponding transmission loss gradually deteriorates.

Method used

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  • Ferroelectric thin-membrane phase shifter, detection and optimization for reflection characteristics
  • Ferroelectric thin-membrane phase shifter, detection and optimization for reflection characteristics
  • Ferroelectric thin-membrane phase shifter, detection and optimization for reflection characteristics

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Embodiment 1

[0025] figure 2 and 3 In, transmission line 21L sect1 and transmission line 22L sect2 are part of transmission line 2, keep L sect1 and L sect2 The total length remains the same, changing the clip in L sect1 and L sect2 between the positions of the ferroelectric tunable capacitor 5, that is connected at the L sect1 C at the end BST1 s position. When the ferroelectric tunable capacitor 5C BST1 From a single periodic structure (ie L sect1 =L sect2 ) increase L sect1 When the length of the circuit is viewed from the input end to the right, its input impedance will increase with C BST1 The location of the different, that is to say, the input impedance is L sect1 function. For a phase shifter designed with a double periodic structure, there is an appropriate C BST1 position, that is, the appropriate L sect1 length such that figure 2 China ferroelectric adjustable capacitor 6C BST2 Match the input impedance of the device. Judging from the frequency response char...

Embodiment 2

[0028] image 3 Among them, on the magnesium oxide substrate 1 with an area of ​​5mm×10mm, the surface is plated with a gold conductive film, and a 300nm-thick barium strontium titanate film is deposited on the area where the adjustable capacitor 5 is formed, a double periodic structure is used. Such as image 3 The layout of the phase shifter structure is shown. Figure 5 It is the frequency response curve of the phase shifter obtained after computer simulation optimization, wherein, S11 is the reflection loss of the phase shifter, and S21 is the transmission loss of the phase shifter. From Figure 5 It can be seen that its operating frequency range extends from DC to 14GHz, and in the entire operating frequency range, the extreme value of its reflection loss is less than -17dB and remains at the same magnitude. In this embodiment, the MgO dielectric constant ε selected by simulation r =9.8, dielectric loss 1.6×10 -6 , the barium strontium titanate thin film deposited on...

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Abstract

A ferroelectric film phase shifter able to dual-periodically install the adjustable ferro-electric capacitor on coplane line consisting of a transmission line and two grounded planes at both sides of said transmission line, which are attached to a plane on substrate, is disclosed. A seam is between said transmission line and a grounded plane. A method for measuring and optimizing its reflection characteristics includes such steps as making the length of adjacent two transmission lines constant, changing the installing position of said adjustable capacitor, checking its reflection and transmission characteristics by computer simulation, regulating the installing position, computer simulation to obtain its reflection frequency response curve, and comparing them to choose the one with less reflection loss and proper bandwidth.

Description

technical field [0001] The invention belongs to the field of microwave engineering, and relates to an impedance-matched ferroelectric film phase shifter and a method for detecting and optimizing its reflection characteristics. Background technique [0002] Phased array antennas are widely used in radar and communication fields. In high-precision phased array antennas, the cost of the phase shifter accounts for about 40% of the cost of the entire antenna. So far, the most widely studied phase shifters are based on ferrite bulk materials and semiconductor switching tubes. The phased array antenna made of ferrite block is not easy to process. In addition, its volume is relatively large, power consumption is large, and the response of beam scanning to control signals is relatively slow. Therefore, there are obvious deficiencies in some fields that require fast beam scanning. Although the phased array antenna based on semiconductor switching tubes can meet the requirements of f...

Claims

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Application Information

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IPC IPC(8): H01P1/18H03H9/66H03H11/16H03H17/08
Inventor 张雪强孟庆端李翡孙亮黄建冬张强何豫生李春光何艾生黎红
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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