Adjustable spiral cavity filter based on liquid medium

A cavity filter and liquid medium technology, applied in the field of communication, to achieve the effect of optimizing tunable performance, facilitating acquisition, and improving tuning accuracy and tuning speed

Pending Publication Date: 2022-04-26
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the defects of the background technology, the present invention proposes a new type of adjustable spiral cavity filter based on liquid medium to solve the tunable problem of the microwave cavity filter

Method used

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  • Adjustable spiral cavity filter based on liquid medium
  • Adjustable spiral cavity filter based on liquid medium
  • Adjustable spiral cavity filter based on liquid medium

Examples

Experimental program
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Effect test

Embodiment 1

[0036] In this example, the frequency adjustment is achieved by using distilled water loading spiral resonator, distilled water in the desired UHF frequency band dielectric constant of 78, loss tangent of 0.015. as Figure 1-5 As shown, take a third-order adjustable cavity filter as an example. The third-order adjustable cavity filter includes the input terminal, output terminal, resonant cavity, spiral structure resonator 5, Teflon tube 4, distilled water, the above input and output terminal are standard SMA connector 3. The thickness of the wall of the Teflon tube 4 is 0.8mm, the inner diameter is 16mm, and the bottom of the Teflon tube 4 is provided with an inlet with an inner diameter of 4mm7. The number of turns of the spiral coil is 2.9 turns, the pitch is 6.8mm, and the spiral structure resonator 5 is closely wrapped around the Teflon tube 4 and connected to the bottom of the resonator. The size of a single resonator is 26mm×32mm×25mm, and the resonant chamber is coupled by ...

Embodiment 2

[0039] In this example, the frequency adjustment is achieved by means of an acetone liquid loading spiral resonator, the dielectric constant of the acetone liquid in the desired UHF band is 21, and the loss tangent is 0.0015. in order to Figure 1 The third-order adjustable cavity filter shown is used as an example to simulate the S-parameter of the filter.

[0040] Figure 8 、 Figure 9 Respectively, the microwave adjustable cavity filter S_11 and the parameter simulation result plot of the S_21 of the microwave adjustable cavity filter in Example 2; Figure 8 、 9 It can be seen that when the height of the acetone liquid column is 0mm, the center frequency of the filter is about 420MHz, and as the height of the acetone liquid column continues to increase, the center frequency of the filter is also decreasing, and when the height of the acetone liquid column reaches a maximum of 20mm, the center frequency of the filter is 345MHz. Over the entire regulation range, the return loss of ...

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Abstract

The invention discloses a liquid medium-based adjustable spiral cavity filter, which comprises a metal cover plate, a metal cavity, an SMA joint, a Teflon tube, a spiral structure harmonic oscillator and a coupling window, and is characterized in that a high dielectric constant medium liquid column is loaded in the spiral cavity filter, and the equivalent electrical length of the spiral structure is changed by changing the height of the liquid medium column, so that the spiral structure can be adjusted; the working frequency of the cavity filter is adjustable. The frequency of the cavity filter is adjustable by using the liquid medium, the cavity filter has the characteristics of high tuning speed, high precision, simplicity in control and low cost, and the size of the cavity filter is greatly reduced under the same frequency by adopting the resonant cavity with the spiral structure.

Description

Technical field [0001] The present invention belongs to the field of communications, in particular to a liquid-based medium adjustable spiral cavity filter. Background [0002] With the rapid development of wireless communication technology, the application of RF microwave circuit system is becoming more and more extensive, and the filter as an important electronic component in the RF microwave circuit system has great research value. The traditional filter resonance frequency is fixed, can only be used in a certain circuit system, there are great limitations in use. The adjustable filter can achieve frequency adjustment without replacing the circuit system, which can not only effectively use the already crowded spectrum, but also replace multiple individual filters, greatly saving installation costs and space. At present, most of the adjustable filters use varactor diodes to achieve [1], which has the advantages of fast tuning speed and low cost, but the resistance loss of vara...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P1/208
CPCH01P1/208
Inventor 张国轩邢蕾徐千
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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