JP3425702B2 - Antenna duplexer - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to an antenna duplexer used for mobile communication devices such as mobile phones. 2. Description of the Related Art When an antenna duplexer is formed by coupling two dielectric filters each having a resonator formed in a dielectric block, a structure as shown in FIG. 4 is usually employed. I have. In the following figures, the dot-filled portions indicate exposed portions (conductor-free portions) of the dielectric block and the substrate. This antenna duplexer is, as shown in FIG.
0, a transmission filter 11 composed of, for example, a two-stage resonator
And the reception filter 12 are arranged in parallel. Specifically, the input / output electrodes 5, 5, 5, 5 of the transmission filter 11 and the reception filter 12, the input / output electrodes 21, 21 and the antenna electrode 22 of the substrate 20,
The outer conductors 4, 4 of the two filters 11, 12 and the ground conductor 23 of the substrate 20 are connected and fixed by soldering, respectively. In the transmission filter 11 and the reception filter 12 constituting the above duplexer, two resonator holes 2 are formed through a pair of opposing surfaces of the dielectric block 1 having a substantially rectangular parallelepiped shape. An inner conductor 3 is formed on the inner peripheral surface of each resonator hole 2. A pair of input / output electrodes 5, 5 are formed at predetermined positions on the outer peripheral surface of the dielectric block 1 so as to extend over the bottom and side surfaces. An outer conductor 4 is formed on the outer surface excluding the outer conductor non-formed portion). [0005] The inner conductor 3 has one opening surface 1 of the resonator hole 2.
a (hereinafter referred to as an open end face), the inner conductor 3
Is formed and separated (opened) from the outer conductor 4,
The other open surface 1 of the resonator hole 2 facing the open side end surface 1a
b (hereinafter referred to as a short-circuit side end face) is electrically connected (short-circuited) with the outer conductor 4. Normally, the transmission filter 11 and the reception filter 1
2 are formed in different dimensions due to differences in frequency and characteristics, and the dimensions and formation positions (distances from the open end surfaces) of the input / output electrodes 5 are also different between the two filters. For this reason, for example, when the input / output electrode 5 is formed at a different position as shown in FIG. 5A, or as shown in FIG.
Is larger than the width of the input / output electrode formation region of the other filter, if the side faces of the transmission filter 11 and the reception filter 12 are arranged in close contact, the input / output electrode 5 formed on the side face of one filter becomes the other. There is a problem in that the short circuit comes into contact with the outer conductor 4 of the filter. In FIG. 5, the contact portion is shown by being circled. Although not shown, the same problem occurs when the height of the input / output electrode formed on the side surface from the bottom surface is larger than the height of the input / output electrode formation region of the other filter. Therefore, both filters 11 and 12 are mounted on the substrate 20.
Conventionally, as shown in FIG. 6, the transmission filter 11 and the reception filter 12 are arranged separately and mounted. As described above, in the conventional antenna duplexer, the two dielectric filters of the transmission filter and the reception filter which constitute the antenna duplexer are mounted on a substrate while being separated from each other. Therefore, there is a problem that the mounting area becomes large and miniaturization is difficult. It is an object of the present invention to solve the above-mentioned problems of the conventional antenna duplexer and to combine two dielectric filters each having a resonator formed in a dielectric block to share the antenna. In the case of configuring the antenna, an object of the present invention is to provide an antenna duplexer that can arrange and mount a transmission filter and a reception filter in close contact with each other, and thus can be further reduced in size. [0011] In order to achieve the above object, the present invention provides a method for forming a resonator hole in a dielectric block,
An inner conductor is formed on the inner peripheral surface of the resonator hole, an outer conductor is formed on an outer surface of the dielectric block, and a pair of input / output electrodes separated from the outer conductor is provided for a transmission filter and a reception filter. In an antenna duplexer in which two dielectric filters are arranged in parallel on a substrate, the dimensions of the input / output electrodes formed on the side surface and the input / output electrode formed on the bottom surface of the transmission filter and the reception filter are each other. To be smaller than the size of the input / output electrode formation area of the filter, and to match the formation positions of the input / output electrodes of both filters,
It is characterized in that both filters are arranged in close contact and mounted on a substrate. According to the above construction, even if the transmission filter and the reception filter are arranged in close contact with each other on the substrate, the input / output electrodes formed on the side surfaces which are the contact surfaces of the two filters each have the other side. There is no short circuit with the outer conductor of the filter. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be specifically described with reference to the drawings showing embodiments thereof. In the figure, the same parts and the same functions as those of the conventional example are denoted by the same reference numerals. FIG. 1 shows the structure of an antenna duplexer according to a first embodiment of the present invention. FIG. 1A is an external perspective view showing a bottom surface side in a state in which a transmission filter and a reception filter constituting an antenna duplexer are closely mounted, and FIG. 1B is a diagram illustrating the transmission filter and the reception filter of FIG. 1A mounted on a substrate. It is an external appearance perspective view of the antenna sharing device. As shown in FIGS. 1 (a) and 1 (b), a transmission filter 11 and a reception filter 12 constituting the antenna duplexer of this embodiment each include a pair of opposing dielectric blocks 1 each having a substantially rectangular parallelepiped shape. Two resonator holes 2 are formed through the surface, and an inner conductor 3 is formed on the inner peripheral surface of each resonator hole 2. A pair of input / output electrodes 5, straddling the bottom surface and side surfaces at predetermined locations on the outer peripheral surface of the dielectric block 1;
The outer conductor 4 is formed on the outer surface except for the area where the input / output electrodes 5 and 5 are formed. The inner conductor 3 is provided with a non-formed portion of the inner conductor 3 in the vicinity of an open end face 1a, which is one opening face of the resonator hole 2, and is separated (opened) from the outer conductor 4 so as to be opened. The short-circuit-side end face 1b facing the end face 1a is electrically connected (short-circuited) to the outer conductor 4. In this embodiment, each of the input / output electrodes 5, 5,.
5 and 5 are formed at substantially the same distance from the open end face 1a, and have widths and side heights smaller than the width and height of the other input / output electrode formation region. Have been. Then, both filters 11, 12
Are arranged such that the input / output electrodes 5, 5 formed on the adjacent side surfaces, which are the contact surfaces, are in the input / output electrode formation region of the other filter, with the respective open side end surfaces 1a being combined. Therefore, even if both filters 11 and 12 are brought into close contact, the input / output electrode 5 of one filter does not come into contact with the outer conductor 4 of the other filter. As shown in FIG. 1B, a transmission filter 11 and a reception filter 12 are formed on a substrate 20 having a pair of input / output electrodes, one antenna electrode, and a ground conductor formed on one surface thereof. With the adjacent sides of the
The integrated antenna duplexer is mounted, with the bottom surface on which the input / output electrodes 5 are formed being mounted on the substrate side. In the antenna duplexer having the above structure, the transmission filter and the reception filter can be mounted in close contact with each other, so that the mounting area can be reduced as compared with the conventional one.
The substrate may be small, and the size can be further reduced. In the above embodiment, the open end faces of the transmission filter and the receive filter are mounted together. However, the present invention is not limited to this. As shown in FIG. Or, as shown in FIG.
It may be mounted without adjusting to any of the end faces. That is,
What is necessary is just to mount so that the input / output electrodes formed on the adjacent side surfaces of both filters are in the input / output electrode formation region of the other filter. As described above, in the antenna duplexer according to the present invention, the formation position and the width of the input / output electrodes of the two dielectric filters constituting the antenna duplexer, the width thereof, and the height dimension of the side surface thereof are determined. The input and output electrodes formed on the side surface and the bottom surface that are the contact surfaces of both filters are set so as not to be short-circuited with the outer conductor of the other filter. Further, the separation of the inner conductor and the outer conductor on the open side end face 1a side is not limited to this, although the inner conductor near the open side end face is provided with the inner conductor non-formed portion in this embodiment. One end in the axial direction of the inner conductor non-formed portion may reach the open end surface, or the outer conductor may not be formed on the open end surface. In each of the above embodiments, the diameter of the resonator hole is constant. However, the diameter of the resonator hole may be changed on the way, and the bottom and top surfaces of the dielectric block may be different. A coupling groove for changing the degree of coupling between the resonators, or a coupling hole for changing the degree of coupling between the resonators may be provided between the resonators. Further, in this embodiment, the antenna duplexer constituted by the transmission filter composed of the two-stage resonator and the reception filter composed of the two-stage resonator has been described. However, the present invention is not limited to this. The filter may be composed of a single-stage resonator with one resonator hole or a three- or more-stage resonator with three or more resonator holes. As described above, according to the antenna duplexer of the present invention, the width of the input / output electrodes of the two dielectric filters constituting the antenna duplexer and the height of the side surface thereof are increased. Since the input and output electrodes of one filter formed on the side surface serving as the contact surface of both filters and the bottom surface are not short-circuited with the outer conductor of the other filter, both filters are connected to the respective filters. The output electrodes can be arranged on the substrate in close contact with each other so that the formation positions of the output electrodes coincide with each other. Therefore, according to the present invention, the mounting area can be reduced as compared with the conventional one, and a smaller antenna duplexer can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 (a) is an external perspective view showing a bottom side of a state in which a transmission filter and a reception filter constituting an antenna duplexer according to an embodiment of the present invention are closely arranged, and FIG. (B) is (a)
FIG. 2 is an external perspective view of an antenna duplexer in which a transmission filter and a reception filter are mounted on a substrate. FIG. 2 is an external perspective view showing a bottom surface side of two dielectric filters constituting an antenna duplexer according to another embodiment of the present invention. FIG. 3 is an external perspective view showing a bottom surface side of two dielectric filters constituting an antenna duplexer according to another embodiment of the present invention. FIG. 4 is an exploded perspective view showing an example of a general antenna duplexer. FIGS. 5A and 5B are plan views viewed from the bottom surface when two dielectric filters constituting a conventional antenna duplexer are closely arranged. FIG. 6 is an external perspective view showing a conventional antenna duplexer. [Description of Signs] 1 Dielectric block 2 Resonator hole 3 Inner conductor 4 Outer conductor 5 Input / output electrode 11 Transmit filter (dielectric filter) 12 Receive filter (dielectric filter) 20 Substrate

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01P 1/20-1/219 H01P ^7/ 00-7/10 H01P 5/08

Claims (1)

(57) [Claim 1] A resonator hole is formed in a dielectric block,
An inner conductor is formed on the inner peripheral surface of the resonator hole, an outer conductor is formed on an outer surface of the dielectric block, and a pair of input / output electrodes separated from the outer conductor is provided for a transmission filter and a reception filter. An antenna duplexer having two dielectric filters arranged in parallel on a substrate, wherein dimensions of an input / output electrode formed on a side surface and an input / output electrode formed on a bottom surface of the transmission filter and the reception filter are each other. An antenna characterized in that both filters are arranged in close contact with each other and mounted on the substrate so as to be formed smaller than the size of the input / output electrode formation area of the filter and to match the formation positions of the input / output electrodes of both filters. Shared device.