JPS58134505A - Printed loop antenna - Google Patents

Abstract

PURPOSE:To facilitate loading of distribution constant reactance by dividing a loop to be printed into plural parts and printing them on one surface and the other surface of a dielectric substrate alternately. CONSTITUTION:On one surface of the dielectric substrate 2, either of divided circular loops 7a and 7b, i.e. 7a is printed. On the other surface, the other divided circular loop 7b is printed. To those loops, a center conductor 10a and an earth conductor 10 are connected from feeding points 8a and 8b through two balanced wires 9a and 9b. The loops 7a and 7b are connected together at a connection part A by through hole plating B. Thus, a distribution constant circuit is connected easily to the connection point A.

Description

DETAILED DESCRIPTION OF THE INVENTION [1] Constructed using the present invention riIli1'#L body substrate
This relates to a nine-tone loop antenna.

Here, for convenience of explanation, a case will be explained in which the shape of the radiation part of the loop antenna is a circular plate shape.

First, let's look at the conventional printed loop antenna shown in Figure 1. Beak.

FIG. 1 is a structural diagram of a conventional printed loop antenna. In the g1 diagram, the mountain is a circular loop.

(2) is the 11111L body board, (3 and (3b) are the feeding points, (4 and (4b) II'i parallel two rocks,
1511; t-balance, (61 has a coaxial plug 0 circular loop 1 mountain, parallel 2 m (4a) and (4b) are IiI
It is printed on one side of the electric board 12), and the circular roof t1) is supplied with power from the power supply point (3 and (3b)) by two parallel wires (1 and 3). Balun (5)
is for converting the unbalanced current from the coaxial plug (group), which is the input/output end of this printed loop antenna, into a parallel current of two parallel currents (4a) and (4b).

This printed loop antenna consists of loop and parallel two I
I! f:! Balun T after printing on 111L body plate
5J and coaxial plug (61T - must be connected.

J11 with many printed loop antennas! However, the disadvantage is that the manufacturing process is only one screw. In addition, when a reactance element is loaded on the loop in order to control the v1 flow on the loop and change the radiation time t-, t/
C also had the disadvantage that since the loop was printed only on one side of the dielectric substrate, it was difficult to connect a reactance element based on a sparse distributed constant.

This invention aims to eliminate these drawbacks.

An embodiment of the present invention, which is formed by combining a loop and a parallel knee on both sides of a single substrate, will be described below with reference to the drawings.

Figures 2 and 3 show puddings according to the invention.

FIG. 2 is a diagram showing the structure of a loop antenna. In Figure 2, +2) is a dielectric substrate, (7aJ and (7b)
is a split circular roof, (81) and (8b) are power feeding points.

(9 and (9b) are two parallel lines*' (10a) is the center conductor.

(10b) is a ground conductor, Qll is a coaxial connector, B is a through-hole plating, and C is a Naha type balun.

! Rrl! Jfill 2FIA (D-divided circular roof (7a) > IU (7b) enlarged view of the connection part 0
It is composed of divided circular loops (7 and (7b)) printed on the front and back sides of the circular roof TL trout electric body 121.
*Electrically conductive through through-hole plating B at connecting part i. This circular loop is connected to a microstrip line formed by a center conductor (10 m) and a ground conductor (10b) from a coaxial plug α11, and a feed point (8a) via two parallel wires (9a) and (9b) Yt of a tapered balun C1.

0-divided circular roof (7a) and (?I)) fed from (8b), feeding points (8a) and (8b), two parallel lines (9a)'1 and (sb), chipper-shaped balance C , the center conductor (10aJ and conductivity) that is popular in microstrip lines:
.

The body (10b) is constructed by printing on the front and back sides of t'L1 # mature substrate + 2) and integrating them.

According to this method, the loop and the feed line including the balanced/unbalanced conversion can be constructed on the same dielectric plate.

The structure is simple and IIJ! It has the advantage of being easy to produce.

FIG. 4 is a diagram showing another embodiment according to the present invention, (2)
is a dielectric substrate, (7m) and (7b) are divided circular 5t
-y* (8a) and (8b) are feeding points, 19
a) Jp and (9b) ti parallel two wao, (10a)
tit center conductor, (10b) is ground conductor, [111 is coaxial plug, Aij connection part, cFi Chiha type paran, D
[The center conductor, E, is through-hole plating. This antenna connects the split circular loops (7a) and (7b) with
c. The center conductor and part of the divided circular roof (71) are loaded with a distributed constant circuit reactance element using a short-circuited microstrip line with mfIt, which controls the input impedance or radiation pattern. In this case as well, a printed loop antenna that is similar in structure to the antenna shown in 8211M and FIG. 3 and is easy to manufacture can be obtained.

FIG. 5 is a diagram showing another embodiment according to the present invention,
(10a) is the center conductor, (10b) is the d ground conductor.

lul is a coaxial plug, ■ is a dielectric board, (13ri and (
13b), (14 heat) and (14b), (1! heat) and (15b) are divided circular ih-ym (9m)
and (9b), (18a) and (16b), (
17 and (17b) are two parallel wires, and F is through-hole plating. Jin's antenna consists of a pair of parallel 2 AT antennas, which are then connected to create a 1 loop array antenna1, so in this case as well, a printed loop antenna with a simple structure and easy fabrication can be obtained. It will be done.

In addition, although the case where the shape of the loop is circular for 0 or more has been explained, it can be implemented in exactly the same way even when the shape is an arbitrary shape such as a circle or a square. Another one-division loop! I
The continuation part explained the case of one plow, but if the II continuation part is made into multiple parts, then there are multiple plows! Distributed constant reactance element tf to I continuation part! It can be carried out in exactly the same way even when loaded.

As explained above, according to the present invention, it is easy to make lli, and the t & load of 9 actance elements is also easy, making it suitable for tumor placement.
This method has a great effect in that a route-1 antenna can be obtained.

[Brief explanation of the drawing]

#! Figure 1 is a structural diagram of a conventional printed loop antenna, Figure 2 is a structural diagram of a printed loop antenna according to the present invention, Figure 3 is an enlarged view, and Figure 4 is a structural diagram showing another embodiment of the present invention. , FIG. 5 is a structural diagram roughly showing another embodiment of the present invention. In the figure, ; indicates a circular loop, 12+, 112Nd dielectric substrate. (3aJ, (3b), iHm), <ah)Fi supply point, (4m), (4bJ, (9s. (9b), (16aJ, (16b), (17aJ)
, (17b) lj parallel two lines, 151u balun,
(7a), (7b), (13a), (13b),
(14aJ, (14bJ, (16a), (15
bJ is divided circular loop, (10aJ, D is center conductor, (10b) u ground conductor, Ai: i connection part,
B, E. ? is a through-hole Metsu beef. It should be noted that the same or equivalent parts in FIG. 0 are denoted by the same reference numerals. Agent Makoto Kuzuno - Figure 1

Claims (1)

[Claims] ■ In a printed loop antenna in which a loop is formed on one side or both sides of one Iv4c body board, and a feed line connected to the loop is printed, the loop t-
A printed loop antenna having seven features, in which the divided loops are divided into a plurality of parts and printed alternately on one side and the other side of the electric substrate. +21 It is assumed that a distributed constant actance element composed of a microstrip collar is loaded in the divided part of a loop divided into a plurality of parts and connected to each other by VC.Printed loop antenna as described in the scope of the request. . Mi31 Roux 1 divided into a plurality of pieces is arranged in 116 layers. Each loop is cascaded to form a 1-lint loop antenna.