JPS59176904A - power distribution combiner - Google Patents

Abstract

PURPOSE:To facilitate the distribution and synthesization of superhigh frequency power with a large coupling degree and a wide band, by setting the thickness of both a resonator and a magnetic field coupling loop at a level within a specific range respectively. CONSTITUTION:In a TM020 mode, the distribution of internal field intensity is shown by dotted lines for a cavity resonator 1, and a magnetic field coupling loop 3 is set at a position close to the maximum value of the field intensity. Then the loop 3 is set at a position close to the maximum value of internal field intensity and the thickness (h) of the resonator 1 is set within a range of lambda/25- lambda/6 together with the thickness (d) of the loop 3 set within a range of lambda/16- lambda/pi with the radius (a) of the resonator 1, the distance (r) from the center of the loop 3, i.e., the radius of the loop position and the wavelength respectively. As a result, the area between the resonator 1 and the loop 3 is increased. This reduces the effect of self-inductance and increases the coupling degree.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a power distribution/synthesizer that distributes or combines ultra-high frequency power using a cylindrical high-order TMOm (+ mode resonator).

Conventional technology and problems In order to distribute or combine ultra-high frequency power, cylindrical high-order TM
An electric field coupling antenna is provided in the center part of the omo mode resonator, and a plurality of magnetic field coupling loops are provided in the peripheral part of the resonator, and the super high frequency power input from the antenna is distributed and outputted by the plurality of loops. A power distribution/combiner is known that combines ultra-high frequency power input into a loop from an antenna and outputs the result. Such a power distribution combiner is
Traditionally used for distributing oscillator output, etc.
Not much consideration was given to the degree of coupling between output and input. In addition, the usable bandwidth is narrower than that of lightning, and it cannot be used for distributing or combining broadband ultra-high frequency power.

OBJECTS OF THE INVENTION It is an object of the present invention to easily distribute or combine ultrahigh frequency power with a high degree of coupling and a wide band. Examples will be described in detail below.

Embodiment of the Invention Figure 1 is a cross-sectional view of the main parts of an embodiment of the present invention, where ■ is a cylindrical TMO 0 mode cavity resonator, 2 is an electric field coupling antenna, and 3 is a magnetic field coupling loop. Yes, the ultra-high frequency power input from the antenna 2 can be distributed to multiple loops 3 and output, and when ultra-high frequency power is input to each of the multiple loops 3, the combined ultra-high frequency power is output from the antenna 2. be able to. In the case of the TMO2G mode, the distribution of the internal electric field strength of the cavity resonator 1 is shown by a dotted line, and the magnetic field coupling loop 3 is arranged near the maximum value of the electric field strength. If the thickness of the resonator 1 is h, its radius is a, the distance from the center of the magnetic coupling loop 3, that is, the radius of the loop position is r, the thickness of the magnetic coupling loop 3 is d, and the wavelength used is λ. , the loop 3 is arranged near the maximum value of the internal electric field strength, the thickness h of the resonator 1 is within the range of λ/25 to λ/6, and the thickness d of the loop 3 is within the range of λ/16 to λ/π
It shall be set within the range of .

Furthermore, the antenna 2 can be coupled to a waveguide or a coaxial line. For example, it is also possible to have a configuration in which a cylindrical TMo+o mode resonator and the resonator 1 are coupled by a coupling window instead of the antenna 2. be. Further, the resonator 1 may be provided with a screw or the like for adjusting the resonance frequency.

By arranging the magnetic field coupling loop 3 near the maximum value of the internal electric field strength, the area formed between the side wall of the resonator 1 and the loop 3 can be increased, so that the degree of coupling can be increased. Furthermore, by setting the thickness h of the resonator 1 within the range of λ/25 to λ/6, it is possible to reduce the influence of the self-inductance of the loop 3 and reduce the decrease in the degree of coupling. Further, it is possible to prevent an increase in insertion loss due to a decrease in Q.

FIGS. 2 to 6 are curve diagrams for explaining the above-mentioned conditions when m=2, that is, a TMO20 mode resonator is used, and the frequency is 6.15 GHz. In Figure 2, the vertical axis is Ez
/Eo (Ez is the internal electric field strength), and the horizontal axis is the radius r (mm) of the loop 3 position. The maximum value of the internal electric field strength exists near r#30 mm. In addition, in Fig. 3, the vertical axis is Qe, which is the external load Q, and
It is a relationship curve diagram between the loop position and Qe, which is the external load Q, where the horizontal axis is the radius r (mm) of the loop 3 position, and the curve (al is h = 8 mm, d = 3 mm, the curve (bl is
h = 8 mm, d = 2 mm, curve (C)
is h-8mm, d=4mm, curve (dl is h=6m
m, d=3mm, curve te+, h=10mm, d=3
This is shown for the case of mm.

In addition, in Fig. 4, the vertical axis is Qe, and the horizontal axis is the diameter d of loop 3.
It is a relationship curve diagram between Qe and diameter d (mm),
Curve (al is h=8mm, r=31mm, curve fb)
is h=3mm, r=37mm, curve fc) is h=8
mm, r=26mm, curve fdl is h-6mm, r=
31mm, curve (e) is tl=10mm, r=31m
This is about the case of m. Further, FIG. 5 is a curve diagram showing the relationship between the thickness h (mm) of the resonator 1 and Qe, and the curve +al is d=3 mm.

r=31mm, curve fbl is d=3m, m, r=37
mm, curve (C1, d = 3 mm, r =
26 mm, curve (dl, d=2mm, r=31mm
, the curve tel is shown for the case where d=4 mm and r=31 mm.

Figure 6 also shows the thickness h (mm) of the resonator and the insertion loss (dB
) is a curve diagram showing the relationship between the curve (al is d=
3mm, r=31mm, curve (bl is d-3mm, r
= 37 mm, curve (C), d = 3 mm.

r=26mm, curve fd) is d=2mm, r=31m
m, curve (el is shown for the case where d=4 mm and r=31 mm.

Since there is an inversely proportional relationship between Qe, which is the external load Q, and the degree of coupling, the point where the minimum value of Qe is the maximum value of the degree of coupling, which corresponds to the order of the higher mode. TeQe
The number of minimum values of is determined. As is clear from FIGS. 2 and 3, the maximum value of the internal electric field strength (dE
It can be seen that Qe takes a minimum value near z/dr-0) (r=30 mm). In this case, it is most preferable to set the loop 3 at the outer periphery, which is about half the diameter d of the loop, rather than the position of the maximum value of the electric field strength.

Further, the conditions for determining the thickness h of the resonator 1 can be found from FIGS. 5 and 6. That is, it can be seen from FIG. 5 that there is an optimum value for the thickness h that reduces Qe. If the thickness h is 20mm or more, Qe
becomes very small, but higher-order modes (TE, mouth mode in this case) will occur, so it is inappropriate to increase the thickness h.

Therefore, the thickness h needs to be 10 mm or less.

Also, looking at the insertion loss characteristics in Figure 6, the diameter d of the loop 3 needs to be 3 mm or more as described later.
curve (under the conditions of al and tel, the insertion loss is 0.
In order to make it 15 dB or less, the thickness h of the resonator l needs to be about 2 to 8 mrn. frequency 6.15
GHz, the wavelength λ is approximately 43.8
Therefore, the thickness h of the resonator 1 is λ/25~
It can be seen that the range needs to be λ/6. Note that the curve f
bl is for r=37mm and is deviated from r#30mm, the maximum value of the internal electric field strength, so the insertion loss is large, and the curve (cl is for r=26mm, so this In this case, the insertion loss increases because the internal electric field strength deviates from the maximum value.Also, the curve (dl) is thinner than the optimum value because the straight line d of loop 3 is 'l m m,
Insertion loss increases.

Also, in Fig. 4, it can be seen that as the diameter d of the loop 3 increases, Qe becomes smaller, but from the conditions of 2≦h≦8 and r=30 mm, considering the curves (al and (dl) In order to prevent Qe from increasing rapidly, the diameter d needs to be 3 mm or more.Also, if the diameter d of the loop 3 is increased and its outer circumference becomes longer than the wavelength λ, a higher-order mode will occur. , there is a limit to the size of the diameter d, and λ
The diameter d must be less than /π. That is, the diameter d of the loop 3 needs to be in the range of λ/16 (3 mm) to λ/π (15 mm).

7 to 12 show the case where m=4, that is, a TMO40 mode resonator is used and the frequency is 6.15 GHz. Figure 7 shows the internal electric field strength distribution similarly to Figure 2, and the maximum value of the electric field strength is approximately 30 mm, 55 mm.
mm, and will occur at a position with a radius r of 80 mm. FIG. 8 is a curve diagram showing the relationship between the radius r of the loop position and Qe, and is for the case where h = 8 mm and d = 3 mm. At the position corresponding to the maximum value of the internal electric field strength,
It can be seen that there is a minimum value of Qe.

FIG. 9 is a curve diagram showing the relationship between the radius r (mm) of the position of loop 3 and Qe, where the curve +a) is h-8mm,
d=3mm, curve (bl is h=8mm, d-2mm,
Curve (C1 is h=8mm, d=4mm, curve +d+ is h=6mm, d=3mm, half fX 1 of loop 3 position
is shown for a range of 75 to 90 mm. Therefore, the minimum value of Qe is obtained corresponding to the maximum value of the internal electric field strength, and the diameter d of the loop 3 is 2 as in the case of the curve (bl).
If the diameter d of the loop 3 is 4 mm, as in the case of curve (C), Qe becomes small.

Moreover, FIG. 10 is a curve diagram showing the relationship between the diameter d of the loop 3 and Qe, and the curve (a) is h78mm, r=81mm.
, curve (bl is h = 8 mm, r = 78 mm, curve (C
) is h=8mm, r=84mm, curve (dl is h=
6mm, r=81mm, curve (e), h=10mm,
This is for the case where r=81 mm. As explained in connection with FIG. 4, the diameter d of the loop 3 is between 3 and 15
It can be seen that it is necessary to set it in the range of mm, that is, in the range of λ/16 to λ/π. In addition, like the curves (bl and (e),
Qe increases if the conditions deviate from the above conditions.

Figure 11 shows the thickness of resonator 1,! It is a curve diagram showing the relationship between =Qe and the curve (al is d=3mm, r-81m
m, curve (bl is d=3mm, r=78mm, curve (
C) is d=3mm, r=84mm, curve +dl is d
=2mm, r=81mm, curve (e) is d-4mm,
This is for the case of r = 81 mm.

If the thickness h of the resonator 1 is 15 mm or more, higher-order modes will occur as described above, so the thickness h must be 10 mm or less, and should be approximately 8 mm or less in view of the insertion loss. .

FIG. 12 is a curve diagram showing the relationship between the thickness h of the resonator 1 and the insertion loss (dB).
=81mm, curve (bl, d=3mm.

r=78mm, curve (C1 is d=3mm, r=84m
m, curve (dl is d=2mm, r=81mm, curve t
el is for the case where d=4 mm and r=81 mm. As can be seen from FIGS. 11 and 12, the optimal thickness h of the resonator 1 is 2 to 8 mm, and when expressed in relation to the wavelength λ, it is λ/25 to λ/6. Note that in the case of m=4, the radius of the loop position is 81 mm, so the relative area formed between the loop 3 and the side wall of the resonator 1 is smaller than in the case of m=2. Therefore, in Fig. 12, the insertion loss is set to 0, and Qe becomes large.
The thickness h of the resonator 1 is selected to be 6 dB or less. Although it is possible to set the radius r of the loop position to a maximum value of the internal electric field strength other than 81 mm,
Considering the arrangement interval of the loops 3, the larger the radius r, the easier the arrangement of the loops 3 will be.

The above embodiments are for the cases where m of TMomo is 2 and 4, but the same tendency is shown when m is set to other values, so the thickness h of the resonator 1 and the loop By selecting the diameter d of No. 3 so as to satisfy the above-mentioned conditions, it is possible to increase the degree of coupling and to distribute or combine broadband Tll high frequency power.

DETAILED DESCRIPTION OF THE INVENTION As described above, the present invention provides a cylindrical high-order TM (1+v
B) In a power distribution combiner using a mode resonator, a plurality of magnetic field coupling loops 3 are provided near the maximum value of the internal electric field,
By selecting the thickness of the resonator 1 within the range of λ/25 to λ/6 and the diameter of the loop 3 within the range of λ/16 to λ/π, it is possible to achieve ultra-high frequency waves with a high degree of coupling and a wide band. It is advantageous to provide a power distribution combiner that can perform power distribution or combination.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of essential parts of an embodiment of the present invention, and FIGS.
The figure shows a curve diagram for m=2 in TMonxo mode, Figure 2 is an internal electric field strength distribution curve diagram, Figure 3 is a curve diagram showing the relationship between the loop position radius and Qe, and Figure 4 is the loop diameter. Figure 5 is a curve diagram showing the relationship between resonator thickness and Qe, Figure 6 is a curve diagram showing the relationship between resonator thickness and insertion loss, Figure 7 is a curve diagram showing the relationship between resonator thickness and Qe. From Figure 12, m
= 4. Figure 7 is an internal electric field strength distribution curve diagram, Figures 8 and 9 are curve diagrams showing the relationship between loop position radius and Qe, and Figure 10 is a diagram showing the relationship between loop diameter and Qe. FIG. 11 is a curve diagram showing the relationship between the resonators, 2 is the resonator, 2 is the electric field coupling antenna, and 3 is the magnetic field coupling loop. Patent applicant Fujitsu Ltd. Representative Patent Attorney Gobe Tamamushi 3 Old age and death 1 Figure ---. Figure 4) ＼. ＼ 00 （ゝQe、S、、 （８）＼、。 00 １・、３ SA Epe Yoshishi゛・１、５．＼、゛′＼ −・− １＼ ＼ １柕１ ji: Heavy industry (h:: , :: (?222:: (?231:: (P2s't mm)
B d-○ groove
1 Figure 9 r (myn) Figure 10 Diameter of loop d (mm)

Claims (1)

[Claims] In a power distribution combiner using a cylindrical high-order 'r M OmO mode resonator, a plurality of magnetic field coupling loops are provided near the maximum value of the internal electric field, and the thickness of the resonator is set to λ/25 to λ.
/6 (λ-wavelength), and the thickness of the magnetic field coupling loop is selected to be within the range of λ/16 to λ/π.