JPS59169207A - Antenna feeding circuit - Google Patents

Abstract

PURPOSE:To increase the space for line wiring and to improve the freedom for wiring by using a parallel line type directional coupler and printing the line part on both sides of a single dielectric substrate. CONSTITUTION:The electric wave given from an input terminal 10 is divided into two parts through a parallel line type directional coupler 18 and then distributed again into two directions by parallel line type directional couplers 16 and 17. Thus a 4-distribution device is obtained as a whole. These couplers 16- 18 of this antenna feeding circuit have their length (l) equal to 1/4 wavelength and therefore reduced occupied areas. This increases the space for line wiring, and furthermore the impedance matching can be easily obtained between a line and its bent area by forming stubs 22. In addition, a line crossover having an extremely small mutual coupling degree can be obtained between lines 20 and 21 by setting these two lines orthogonal to each other since the line parts are printed on both sides of a dielectric substrate 5 with insulation secured by a dielectric substance. Thus, the freedom for wiring is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an antenna feeding circuit composed of strip lines.

Here, for convenience of explanation, the number of elements of the array antenna to be fed is assumed to be four, and the explanation will be made using an antenna feeding circuit in which the number of power distributions is four.

First, the conventional cohort feed type antenna ff! shown in FIGS. 1 and 2! The i-cage circuit will be explained. 1st
In the figure, fil and (2) are the @electric and ground conductors of the first dielectric substrate, (3) and (4) are the dielectric and ground conductor of the second dielectric substrate, and (5) is the @electric and ground conductor of the second dielectric substrate. 3 dielectric substrate, +61. '(71 is the input/output terminal. Figure 2 is a detailed diagram of the third board (5) for one-piece greeting card. +81. (9
), α old input/output terminal, (III, FIZ, G:1
is a hybrid ring type directional coupler, σ4) is a honeycomb resistor, and 09 is a quarter wavelength line with an open end. This antenna feeding circuit is a dielectric (1).

(3), ground conductor +21. t4) is a triplate strip line type consisting of a line etched on one side of a dielectric substrate (5). The electric waves incident from the input/output terminal αQ are passed through a hybrid ring type directional coupler (
13 and is further divided into two parts through the hybrid ring type directional coupler (111 and +t21'1), forming a four-way distributor as a whole.

The chip resistor α4) and the open-ended quarter-wavelength line US are non-reflection terminators connected to the isolation terminals of each hybrid ring type directional coupler.

The peripheral length of one hybrid ring type directional coupler in this antenna feeding circuit is 1.5 wavelengths and the occupied area is large, so if the allowable area as an antenna feeding circuit is limited, the space for line wiring is limited. The drawback was that it was difficult to design due to restrictions. Another disadvantage is that the line portion of this antenna feeder circuit is entirely printed on one side of a single dielectric substrate, so it is not possible to wire the lines across each other, which limits the degree of freedom in wiring. It also had

This invention uses a parallel line type blade directional coupler as a directional coupler to eliminate these drawbacks.

A line portion is printed on both sides of a single dielectric substrate, and one embodiment of the present invention will be described below with reference to the drawings.

FIGS. 3, 4, and 5 are diagrams showing the structure of the antenna feeding circuit according to the present invention. In Figure 3 (5)
is the third dielectric substrate, (6), (7), (81,
(9) 101 is input/output terminal, +141 & chip resistor,
US+ is an open-ended quarter-wavelength line, +161.17
1. Q[l&! The parallel line rectangular directional coupler 91 is a line intersection, (20+, (211 is a feed line).

Figure 4 is a detailed diagram of the parallel line type directional coupler t+61.
+221 is a matching stub. Figure 5 shows the railway intersection (
9) In the detailed cross-sectional view of the vicinity, (11, +21 is the first s
The dielectric and ground conductor of the k-body substrate, (3) and (4) are the second
The dielectric and ground conductor of the dielectric substrate, f2t1',
'e! 11&! It is a power supply line. Electric waves incident from the input/output end Q(I) pass through the parallel line type directional coupler a second and are divided into two, and roughly pass through the parallel line type edge directional couplers αe and (17+) and are divided into two each. , forming a 4-way distributor as a whole.

Parallel line type directional coupler afA of this antenna feeding circuit
, α7+, Q8 & Further, as shown in FIG. 4, impedance matching with the line due to the nine portions of the line curve can be easily achieved by providing a stub t221.

Furthermore, since the line portion is printed on both sides of the dielectric substrate (5) and insulated with dielectric material, mutual coupling can be achieved by crossing the lines f20) and t21+ orthogonally as shown in Figure 5. Very small track crossings can be provided. Parallel line type blade directional coupler Q61. α71. I8
The phase difference between the outputs of each of the two distributions is exactly 90°, but the difference is from input/output terminal Ill to input/output terminal +61. +71. +81.
In-phase distribution and combination is possible by appropriately choosing the line length up to +9+.

According to this configuration, the area occupied by one directional coupler can be small, so that a large space for line wiring can be secured. Alternatively, there is a disadvantage that the area of the substrate used becomes smaller. Another advantage is that since it is printed on both sides of the board, there is more freedom in line wiring methods.

FIG. 6 is a diagram showing another embodiment according to the present invention.

9. It is a series feeding type antenna feeding circuit. (5) is the third
dielectric substrate, +61. +7L +81. (91
, (1 (11 input/output terminals.

Ω, I24. (251 rts parallel line type directional coupler, @ is the reference point of the directional coupler, @ C is the radio wave absorber. From the reference point mother to the input and output terminals (61, (71, (81, (9
The length of each line including the directional coupler up to 1 is the same, and the input wave from input/output terminal α is: input/output terminal (61, (
71,! 81. (9) in the same phase over a wide band. In this case as well, it is possible to obtain an antenna feeder circuit that uses a small board area and has a large degree of freedom in line wiring, similar to the antenna feeder circuits shown in FIGS. 3, 4, and 5.

Although 0 or more power supply formats have been described in terms of a cohort power supply type and a series power supply type, the present invention is not limited thereto, and can be implemented in exactly the same manner in the case of a combination of these types. Also.

Although the case where the directional coupler is only of the parallel line type has been described, it can be implemented in exactly the same way even if the directional coupler is configured in combination with a hybrid ring type or a branch line type. The same method can be applied to a case where the number of distributions is roughly arbitrary.

As explained above, according to the present invention, an antenna feeding circuit can be constructed using both sides of a dielectric substrate having a narrow area, so that there is a great effect in terms of substrate savings and freedom in line design.

[Brief explanation of the drawing]

1 and 2 are structural diagrams of a conventional antenna feeding circuit, FIG. 3, FIG. 4, and FIG. 5 are structural diagrams of an antenna feeding circuit according to the present invention, and FIG. 6 is a structural diagram of a conventional antenna feeding circuit. FIG. In the figure, (5) is a dielectric substrate, +61. (71, (8
1, (91, Q1 construction input/output terminal, (ill, f+21
．． (+31 is a hybrid ring type directional coupler, (
1B+, αri, 081. +23i, (241,(
) is a parallel line rectangular directional coupler, (+9 is a railway intersection,
(2■Ma stub. @ is a radio wave absorber. The same or equivalent part in Figure 0 is indicated with the same prefecture name. Agent Shin Kuzuno - (Sensei Figure 1 Figure 4) Figure 5 Figure 68

Claims (2)

[Claims] (1) First and second with a ground conductor surface on one side
and a third dielectric substrate, which is provided between the first and second dielectric substrates, with the other surface different from the ground conductor surface of the first and second dielectric substrates facing each other. In the shaped antenna feed path, both surfaces of the third inducer substrate or surfaces different from the ground conductor surface of the first and second dielectric substrates are used. Two or more parallel line type directional couplers and a plurality of feed lines are printed, and each of the two or more parallel line type directional couplers is a connection part with the above feed 1JL line. An antenna feeding circuit characterized in that printed stubs are provided at each of the four line bends. (2) Two or more supply lines are wired to be orthogonal to each other at one or more locations on the electric body of the third dielectric substrate by an engineer. Term H
Antenna power supply circuit mounted on the antenna. (37) Two or more parallel line type directional couplers have a non-reflective terminator, and the non-reflective terminator is provided between the ground planes of the first and second dielectric substrates. An antenna feeding circuit according to claim 1, characterized in that: