WO1992003033A1 - Compliancy tolerant pattern for circuit carrying substrates - Google Patents

Compliancy tolerant pattern for circuit carrying substrates Download PDF

Info

Publication number
WO1992003033A1
WO1992003033A1 PCT/US1991/004435 US9104435W WO9203033A1 WO 1992003033 A1 WO1992003033 A1 WO 1992003033A1 US 9104435 W US9104435 W US 9104435W WO 9203033 A1 WO9203033 A1 WO 9203033A1
Authority
WO
WIPO (PCT)
Prior art keywords
substrate
component
circuit
apertures
expansion
Prior art date
Application number
PCT/US1991/004435
Other languages
French (fr)
Inventor
Andrew T. Morrison
Aaron B. Mullins
Original Assignee
Motorola, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Motorola, Inc. filed Critical Motorola, Inc.
Publication of WO1992003033A1 publication Critical patent/WO1992003033A1/en

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/0271—Arrangements for reducing stress or warp in rigid printed circuit boards, e.g. caused by loads, vibrations or differences in thermal expansion
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/11—Printed elements for providing electric connections to or between printed circuits
    • H05K1/115—Via connections; Lands around holes or via connections
    • H05K1/116—Lands, clearance holes or other lay-out details concerning the surrounding of a via
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/0213—Electrical arrangements not otherwise provided for
    • H05K1/0237—High frequency adaptations
    • H05K1/0243—Printed circuits associated with mounted high frequency components
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/06—Thermal details
    • H05K2201/068—Thermal details wherein the coefficient of thermal expansion is important
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/09—Shape and layout
    • H05K2201/09009—Substrate related
    • H05K2201/09063—Holes or slots in insulating substrate not used for electrical connections
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/09—Shape and layout
    • H05K2201/09009—Substrate related
    • H05K2201/09072—Hole or recess under component or special relationship between hole and component
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/09—Shape and layout
    • H05K2201/09009—Substrate related
    • H05K2201/09081—Tongue or tail integrated in planar structure, e.g. obtained by cutting from the planar structure
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/09—Shape and layout
    • H05K2201/09145—Edge details
    • H05K2201/09172—Notches between edge pads
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
    • H05K2201/10007—Types of components
    • H05K2201/1006—Non-printed filter

Definitions

  • This invention relates generally to communication devices, and more specifically to circuit carrying substrates for such devices, and is particularly directed toward circuit carrying substrates used with circuit components having a thermal coefficient of expansion and contraction (TCE) different than that of the circuit carrying substrate.
  • TCE thermal coefficient of expansion and contraction
  • a communication device comprising a transceiver circuitry for receiving and transmitting radio frequency signals includes a circuit carrying substrate.
  • the substrate has a plurality of apertures of equal or differing widths and lengths disposed directly beneath certain circuit component(s).
  • FIG. 1 is a perspective illustration of a populated circuit carrying substrate in accordance with the present invention.
  • FIG. 2 is a block diagram of a communication device in accordance with the present invention.
  • FIG.3 is a derivative of Fig. 1 illustrating more details of the invention.
  • FIG. 4 is an illustration of a circuit carrying substrate illustrating an optional embodiment of the present invention.
  • circuit carrying substrate (printed circuit board) 108 in accordance with the present invention.
  • the printed circuit board 108 includes a plurality of apertures 104 disposed thereon.
  • the illustrated printed circuit board 108 accommodates at least a portion of transceiver circuitry such as components 102, 110, 112, and 114 that are coupled to the printed circuit board 108 via an adhesive agent such as solder.
  • circuit component(s) e.g., a filter(s)
  • 102 is coupled to the printed circuit board 108 over the plurality of apertures 104.
  • the circuit component(s) 102 may be an aggregate of components assembled on any substrate such as ceramic with a different thermal coefficient of expansion and contraction than that of the printed circuit board 108.
  • the circuit component(s) 102 may be coupled to the printed circuit board 108 via one or several known and inclusive surface mount or pin connections.
  • the plurality of apertures 104 form a structure that will accommodate some degree of thermal expansion and contraction, thereby allowing two different materials having differing thermal characteristics expand and contract without component breakage or cracks in the adhesive agent (e.g., solder).
  • the adhesive agent e.g., solder
  • the printed circuit board 100 of FIG. 1 is shown with the filter 102 removed for clarity of plurality of apertures 104 in accordance with the present invention.
  • the plurality of apertures blend into each other leaving some or all the area on the printed circuit board 108 beneath the filter 102 void 302.
  • Said void 302 would absorb some of the expansion or contraction of the printed circuit board 108 locally and stops it from multiplying and moving to the sides, thereby relieving the strain from the filter 102 which does not expand or contract equally.
  • the plurality of apertures 104 may be aligned so as to produce any angle(s) with the circuit components) 102 and be of equal or differing lengths and/or widths. Said plurality of apertures 104 may protrude beyond the boundaries of one or all sides of the circuit component(s) 102 thereon. Furthermore, the plurality of apertures 104 may be variably spaced from each other and cover all or part of the circuit component(s) 102 as required by the design known to people skilled in the art.
  • the printed circuit board 100 of FIG. 1 is shown with the filter 102 removed for clarity of an optional embodiment of plurality of apertures 402, 404, and 406.
  • Said plurality of apertures 402, 404, and 406 form H or U shapes with fingers protruding the openings of such shapes to provide coupling of the filter 102 to the printed circuit board 108.
  • Said plurality of apertures 402, 404, and 406 may be repeated for additional electrical coupling and mechanical decoupling of the filter 102 to the printed circuit board 108. Referring to Fig.
  • a radio communication device 200 in accordance with the present invention includes an antenna switch 204 that can selectively couple the antenna 202 to either a receiver 208 via filter(s) 206 or a transmitter 228 via filter(s) 230.
  • a radio frequency signal is routed from an antenna 202 to a receiver 208 via the antenna switch 204 and a filter(s) 206.
  • the receiver 208 may be of conventional design.
  • the receiver 208 provides data messages to the controller 212 via data line 210.
  • the controller 212 operates to alert the radio user and present a received message in a variety of ways depending upon the message type and optional features that may be enabled or disabled by the radio user.
  • the controller 212 may send an alert signal to an amplifier 216, via data line 214, to be presented to the radio operator via the speaker 218.
  • a voice message may be provided by the receiver 208 to the amplifier 216 for presentation via the speaker 218.
  • Data messages would follow the radio's address code to the controller 212 via data line 210.
  • Such messages are subsequently analyzed by the controller 210 and if appropriate sent to a display 222 for presentation.
  • a voice message is routed from the microphone 224 to the transmitter 228 for transmission via the antenna 202 through filter(s) 230 and antenna switch 204.
  • Data messages are processed by the controller 212 and are subsequently presented to the transmitter 228 for transmission via the antenna 202 through filter(s) 230 and antenna switch 204.

Abstract

A circuit carrying substrate (108) accommodates circuit components (102) with different coefficients of expansion and contraction from that of the circuit carrying substrate (108). Beneath such components (102) a plurality of slots (104) are formed so as to minimize the effects of such differing coefficients of expansion and contraction.

Description

COMPLIANCY TOLERANT PATTERN FOR CIRCUIT CARRYING SUBSTRATES
Technical Field This invention relates generally to communication devices, and more specifically to circuit carrying substrates for such devices, and is particularly directed toward circuit carrying substrates used with circuit components having a thermal coefficient of expansion and contraction (TCE) different than that of the circuit carrying substrate.
PacKgrewnti
It is known that the mechanical coupling of certain circuit components to various substrates or printed circuit boards is hampered by the differing TCE of such materials. Such coefficient differentials often result in component breakage or cracks in the adhesive agents (e.g., solder), which results in contact intermittences.
In the past, various methods have been employed to minimize the effects of such incompatibilities. For example some manufacturers employ customized brackets to attach certain components to the printed circuit boards. However, the increased material cost, special handling, and the maintenance of additional inventory have rendered such approaches less desirable. In many cases, additional compensation circuitry must be added to the design to compensate for changes in electrical performance due to the brackets. This has resulted in higher product and development costs and additional inventory.
Accordingly, a need exists for a printed circuit board pattern capable of reducing the detrimental effects of the TCE incompatibilities between circuit components and the substrates carrying them.
Summary of the Invention
Briefly, according to the invention, a communication device comprising a transceiver circuitry for receiving and transmitting radio frequency signals includes a circuit carrying substrate. The substrate has a plurality of apertures of equal or differing widths and lengths disposed directly beneath certain circuit component(s).
Brief Description of the Drawings
FIG. 1 is a perspective illustration of a populated circuit carrying substrate in accordance with the present invention. FIG. 2 is a block diagram of a communication device in accordance with the present invention.
FIG.3 is a derivative of Fig. 1 illustrating more details of the invention.
FIG. 4 is an illustration of a circuit carrying substrate illustrating an optional embodiment of the present invention.
Detailed Description of the Preferred Embodiment Referring to Figure 1 , there is shown a circuit carrying substrate (printed circuit board) 108 in accordance with the present invention. The printed circuit board 108 includes a plurality of apertures 104 disposed thereon. The illustrated printed circuit board 108 accommodates at least a portion of transceiver circuitry such as components 102, 110, 112, and 114 that are coupled to the printed circuit board 108 via an adhesive agent such as solder. In accordance with the present invention circuit component(s) (e.g., a filter(s)) 102 is coupled to the printed circuit board 108 over the plurality of apertures 104. The circuit component(s) 102 may be an aggregate of components assembled on any substrate such as ceramic with a different thermal coefficient of expansion and contraction than that of the printed circuit board 108. The circuit component(s) 102 may be coupled to the printed circuit board 108 via one or several known and inclusive surface mount or pin connections.
The plurality of apertures 104 form a structure that will accommodate some degree of thermal expansion and contraction, thereby allowing two different materials having differing thermal characteristics expand and contract without component breakage or cracks in the adhesive agent (e.g., solder).
Referring to Fig. 3, the printed circuit board 100 of FIG. 1 is shown with the filter 102 removed for clarity of plurality of apertures 104 in accordance with the present invention. Preferably the plurality of apertures blend into each other leaving some or all the area on the printed circuit board 108 beneath the filter 102 void 302. Said void 302 would absorb some of the expansion or contraction of the printed circuit board 108 locally and stops it from multiplying and moving to the sides, thereby relieving the strain from the filter 102 which does not expand or contract equally.
Optionally the plurality of apertures 104 may be aligned so as to produce any angle(s) with the circuit components) 102 and be of equal or differing lengths and/or widths. Said plurality of apertures 104 may protrude beyond the boundaries of one or all sides of the circuit component(s) 102 thereon. Furthermore, the plurality of apertures 104 may be variably spaced from each other and cover all or part of the circuit component(s) 102 as required by the design known to people skilled in the art.
Referring now to FIG.4, the printed circuit board 100 of FIG. 1 is shown with the filter 102 removed for clarity of an optional embodiment of plurality of apertures 402, 404, and 406. Said plurality of apertures 402, 404, and 406 form H or U shapes with fingers protruding the openings of such shapes to provide coupling of the filter 102 to the printed circuit board 108. Said plurality of apertures 402, 404, and 406 may be repeated for additional electrical coupling and mechanical decoupling of the filter 102 to the printed circuit board 108. Referring to Fig. 2, a radio communication device 200 in accordance with the present invention includes an antenna switch 204 that can selectively couple the antenna 202 to either a receiver 208 via filter(s) 206 or a transmitter 228 via filter(s) 230. To receive a message, a radio frequency signal is routed from an antenna 202 to a receiver 208 via the antenna switch 204 and a filter(s) 206. The receiver 208 may be of conventional design. The receiver 208 provides data messages to the controller 212 via data line 210. Typically, the controller 212 operates to alert the radio user and present a received message in a variety of ways depending upon the message type and optional features that may be enabled or disabled by the radio user. Thus the controller 212 may send an alert signal to an amplifier 216, via data line 214, to be presented to the radio operator via the speaker 218. After the alert, a voice message may be provided by the receiver 208 to the amplifier 216 for presentation via the speaker 218. Data messages would follow the radio's address code to the controller 212 via data line 210. Such messages are subsequently analyzed by the controller 210 and if appropriate sent to a display 222 for presentation. To transmit a signal, a voice message is routed from the microphone 224 to the transmitter 228 for transmission via the antenna 202 through filter(s) 230 and antenna switch 204. Data messages are processed by the controller 212 and are subsequently presented to the transmitter 228 for transmission via the antenna 202 through filter(s) 230 and antenna switch 204. We claim:

Claims

Claims
1. A substrate assembly, comprising: a circuit carrying substrate, having a coefficient of expansion and contraction and a plurality of apertures, and a component having a different coefficient of expansion disposed on said substrate spanning at least some of said apertures, the apertures accommodating the different coefficients of expansion of the substrate and the component.
2. The substrate assembly of claim 1 , wherein said circuit component comprises a ceramic based component.
3. The substrate assembly of claim 2, wherein said ceramic based circuit component comprises a filter(s).
4. The substrate assembly of claim 1 , wherein said plurality of apertures form H shapes with fingers providing coupling of said component to said circuit carrying substrate.
5. The substrate assembly of claim 1 , wherein said plurality of apertures form U shapes with fingers providing coupling of said component to said circuit carrying substrate.
6. A communication device, comprising: radio circuitry for receiving and transmitting radio frequency signals and including a plurality of circuit components having a first coefficient of expansion and contraction; and at least one circuit carrying substrate having a coefficient of expansion and contraction different from the first coefficient, the substrate constructed and arranged to accommodate at least a portion of the transceiver circuitry, the circuit carrying substrate having at least one or a plurality of slots disposed beneath at least one of said circuit components for accommodating the different coefficients of expansion and contraction of the substrate and the component.
7. The communication device of claim 6, wherein said at least one component comprises a ceramic based circuit component.
8. The communication device of claim 7, wherein said ceramic based circuit component comprises a filter(s).
9. The communication device of claim 6, wherein said plurality of apertures form H shapes with fingers providing coupling of said component to said circuit carrying substrate.
10. The communication device of claim 6, wherein said plurality of apertures form U shapes with fingers providing coupling of said component to said circuit carrying substrate.
PCT/US1991/004435 1990-07-30 1991-06-21 Compliancy tolerant pattern for circuit carrying substrates WO1992003033A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US561,407 1983-12-14
US56140790A 1990-07-30 1990-07-30

Publications (1)

Publication Number Publication Date
WO1992003033A1 true WO1992003033A1 (en) 1992-02-20

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1991/004435 WO1992003033A1 (en) 1990-07-30 1991-06-21 Compliancy tolerant pattern for circuit carrying substrates

Country Status (1)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0921715A1 (en) * 1997-11-06 1999-06-09 Samsung Electronics Co., Ltd. PCB for mounting RF band pass filter and method of manufacture

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4930045A (en) * 1989-10-26 1990-05-29 Sundstrand Corporation High power, high temperature disassemblable ceramic capacitor mount

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4930045A (en) * 1989-10-26 1990-05-29 Sundstrand Corporation High power, high temperature disassemblable ceramic capacitor mount

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0921715A1 (en) * 1997-11-06 1999-06-09 Samsung Electronics Co., Ltd. PCB for mounting RF band pass filter and method of manufacture

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