Continuously adjustable phase shifter

Abstract

This invention provides a continuous-adjustable phase shifter containing a dielectric plate, a sliding plate, a coupling plate, a transmission-line board, among which the sliding plate is to form an air microstrip transmission line by two up-and-down strips, the coupling plate is to form a parallel transmission line by two up-and-down symmetrical metal plates and the dielectric plate fixed by a clip block at the outside of the sliding plate by use of the transition meander line microstrip structure connected with metal plate. The transmission line board decomposes the input radiation signal To to at least two routes of output signals and distributes the power at will to connect one of the routes to both ends of the sliding plate, then to send them to each radiation unit respectively after phase shift, and another route is connected directly to the radiation unit.

Description

Technical field: [0001] The invention relates to an antenna component, in particular to a continuously adjustable phase shifter. The continuously adjustable phase shifter is especially suitable for array antennas that scan beams and change the shape of side lobes. Background technique: [0002] As we all know, the phase shifter is a key component to change the beam scanning of the array antenna. The phase shifters of various structures used in the existing antenna arrays all have defects in different degrees. For example, Figure 8 The shown Chinese patent 96193925.7 is an antenna array composed of three elements. The phase shifter of the antenna array is composed of a dielectric microstrip plate 16 , a dielectric sliding plate 17 and a metal base plate 18 . Microstrip lines 19 and branch lines 20 are engraved on the dielectric microstrip plate 16 . When the dielectric sliding plate 17 moves along the z direction, the signal transmission rate in the microstrip curve sect...

AI Technical Summary

Problems solved by technology

It is not difficult to see that ε r The larger it is, the greater the impact of the dielectric sheet on the characteristic impedance, the more serious the impedance mismatch in the feeder network, which will naturally lead to an increase in reflection and a sharp deterioration of the voltage standing wave ratio;

[0005] (3) With ε r With the increase of ε, the insertion loss caused by the dielectric sheet also increases rapidly, and the high ε r Low insertion loss media are hard to come by and extremely expensive

[0008] (2) The missing outer conductor at the gap 22 of the coaxial line 21 is replaced by a sliding sleeve 26. Since the inner diameter of the sliding sleeve 26 is larger than the inner diameter of the outer conductor of the coaxial line 21, the coaxial line 21 at the gap is located The characteristic impedance is larger than the characteristic impedance without gaps, so the impedance does not match;

[0009] (3) The impedance transformation section of this technology is composed of Coaxial line 23 constitutes due to is the frequency f 0 Closely related, when the frequency changes, the length of the coaxial line 23 will no longer be Therefore, the impedance transformation section cannot well realize the function of impedance transformation, and there is a deficiency of narrow impedance bandwidth;

[0010] (4) Since this technology adopts the "T" branch of the coaxial line, the coaxial line 23 can no longer be divided into multiple channels, so when it wants to feed a multi-unit antenna array, multiple phase shifters must be connected in series and parallel. In this way, it will inevitably cause the insertion loss of multiple phase shifters to be superimposed in series;

[0011] (5) Since the inner and outer sliding sleeves 26 and 24 used in this technology are not equal in length, it will inevitably lead to an unbalanced coupling current between the inner and outer sleeves, which will cause a current on the outer wall of the outer conductor of the coaxial line 21, resulting in energy loss

[0012] (6) It is not possible to use one phase shifter to achieve phase-shift feeding to multiple radiating units. For example, to phase-shift feeding to four radiating units, three phase shifters must be combined in series and parallel, as shown in Figure 7(b) shows that the structure is complex and inconvenient to use

Images