JPH0593101U - Dielectric filter - Google Patents

Abstract

(57) [Abstract] [Purpose] To reduce the mass production cost by omitting the metal terminals that are caulked and soldered for surface mounting the dielectric filter mounted on the rectangular printed wiring board. [Structure] A plurality of dielectric resonators 1 and a coupling chip capacitor 3 are fixed and connected to a circuit, and both ends of one side in the longitudinal direction of a printed wiring board 4 are extended, and a filter is inserted on one or both sides thereof. A continuous wiring conductor was provided on each of the output terminals to provide surface mounting terminal portions 5 and 6.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a dielectric filter used in a high frequency circuit of a mobile communication device such as a car phone.

[0002]

[Prior Art]

 With the demand for smaller and lighter mobile communication devices, the electronic components used have become smaller, and surface mounting technology has come to be applied. ICs and capacitors have been put into practical use as chips, but dielectric filters used in high-frequency circuits are made into chips because multiple dielectric resonators are connected in multiple stages to form one functional component. It is a difficult part to do.

FIG. 5 is a perspective view of a conventional dielectric filter. In the figure, reference numeral 1 is a dielectric resonator, and three dielectric resonators are shown. Reference numeral 16 is a filter substrate on which a printed wiring board is used. Reference numeral 2 denotes a hole provided in the printed wiring board 16, and the inner conductor of the dielectric resonator 1 is fitted and fixed in the hole. Reference numeral 3 is a chip capacitor as a coupling element soldered to the printed wiring conductor of the printed wiring board 16. The coupling element may be an inductance. In an actual product, a dielectric filter is configured by mounting an outer case that covers the three dielectric resonators 1 and is fixed to the printed wiring board 16, but this is omitted in this figure. Reference numerals 17 and 18 denote metal input / output terminals (metal terminals) provided for surface-mounting the dielectric filter having such a structure together with other circuit components on an external circuit board. The two metal terminals 17 and 18 and the L metal fittings provided on the side surface of the head of the case are soldered and fixed to the external circuit board.

[0004]

[Problems to be solved by the device]

 The metal terminals 17 and 18 provided for surface mounting the dielectric filter are crimped to the printed wiring board 16 of the filter and then fixed by soldering, but the printed wiring board 16 is small. Since the metal terminals 17 and 18 are even smaller, the workability is poor and they are not suitable for mass production, which is an obstacle to cost reduction. An object of the present invention is to improve the structure of the metal terminal, which is a drawback of the prior art, and to provide a dielectric filter having good workability and eliminating obstacles to cost reduction.

[0005]

[Means for Solving the Problems]

 The dielectric filter of the present invention is a dielectric filter in which a plurality of dielectric resonators, a coupling capacitor, an inductance and the like are attached to a rectangular printed wiring board, wherein the printed wiring board is Both ends of one side in the direction are extended, and printed wiring conductors are continuously provided from one side or both sides of the extended portion from the input / output terminals of the dielectric filter, and are surface-mounted on the external circuit board. It is characterized in that the terminal portion for the is configured.

[0006]

【Example】

 FIG. 1 is a perspective view showing a first embodiment of the present invention. As in FIG. 5, the outer case is omitted. 1, 2, and 3 are the dielectric resonator, hole, and chip capacitor, as in FIG. The circuit configuration is a capacitively coupled bandpass filter in which three dielectric resonators 1 are coupled by a coupling element, for example, a capacitor 3. The inner conductors of the three dielectric resonators 1 are fitted into the holes 2 of the printed wiring board 4 and soldered to be electrically connected. Reference numerals 5 and 6 are essential parts of the present invention, and are terminal portions provided by extending both end portions of one side in the longitudinal direction of the printed wiring board 4. Printed conductors that are continuous from the input / output terminals of the filter are provided on both the front and back sides (may be one side) of the terminals 5, 6, and lay this dielectric filter sideways as shown in the figure. It can be surface-mounted by mounting it on an external circuit board (not shown) in this state and soldering the conductor edges of the terminals 5, 6 and the conductor surface of the external circuit board.

2, FIG. 3 and FIG. 4 are perspective views showing second, third and fourth embodiments of the present invention, respectively. The printed wiring boards 7, 10, and 13 shown in these figures are different in the shapes of their respective terminal portions 8 and 9, 11 and 12, and 14 and 15. The printed wiring board 7 of FIG. 2 has a trapezoidal shape, and the diagonally extended portions of the lower side thereof serve as the terminal portions 8 and 9. The printed wiring board 10 of FIG. 3 has a trapezoidal lower side and a lower edge cut obliquely, and the conductor edges at the tips of the terminals 11 and 12 are soldered to the conductor surface of the external circuit board. It The terminal portions 14 and 15 of the printed wiring board 13 of FIG. 4 are shaped such that the lower edge portions of the terminal portions 5 and 6 of the embodiment of FIG. 1 are extended downward, and the terminal portions 14 and 15 are provided on the circuit board. It is soldered by fitting it into the recess or square hole.

[0008]

[Effect of the device]

 As described in detail above, by implementing the present invention, it is not necessary to newly install a terminal for surface mounting a dielectric filter, and there is no need for a metal terminal and its installation work which has been conventionally required. Therefore, it has an extremely large effect on cost reduction in mass production.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

FIG. 2 is a perspective view showing a second embodiment of the present invention.

FIG. 3 is a perspective view showing a third embodiment of the present invention.

FIG. 4 is a perspective view showing a fourth embodiment of the present invention.

FIG. 5 is a perspective view of a conventional structure.

[Explanation of symbols]

 1 Dielectric Resonator 2 Hole 3 Chip Capacitor 4 Printed Wiring Board 5, 6 Terminals 7, 10, 13 Printed Wiring Board 8, 9, 11, 12, 14, 15 Terminals 16 Printed Wiring Board 17, 18 Metal Terminal

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yusaku Mamitsuka 64 Nagano Tennuma, Tenno-cho, Minami-Akita-gun, Akita Prefecture Goyo Denshi Kogyo Co., Ltd. Electronic Industry Co., Ltd. (72) Inventor Kazuhiro Tomiya 64 Nagao Tenno, Tenno-cho, Minami-Akita-gun, Akita Prefecture Goyo Electronic Industry Co., Ltd. (72) Inventor Sasaki Kanemi 2-3-3 Toranomon, Minato-ku, Tokyo Kokusai Den Ki Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A dielectric filter in which a plurality of dielectric resonators, coupling capacitors, inductances and the like are attached to a rectangular printed wiring board, wherein the printed wiring board has both ends of one side in the longitudinal direction. The extended portion is provided, and printed wiring conductors are continuously provided from the input / output terminal portion of the dielectric filter on one or both surfaces of the extended portion to form a terminal portion for surface mounting on an external circuit board. Dielectric filter characterized in that