Browse Prior Art Database

SURFACE MOUNT ANTENNA TUBE

IP.com Disclosure Number: IPCOM000009432D
Original Publication Date: 1999-Sep-01
Included in the Prior Art Database: 2002-Aug-23
Document File: 3 page(s) / 131K

Publishing Venue

Motorola

Related People

Mohammad Khalid: AUTHOR [+2]

Abstract

The antenna designs in a radio or a cellular unit requires the antenna to be surrounded by an antenna tube as part of the RF and the Electrical require- ments as shown in Figure 1. The existing assembly process is performed as follows; (a) the antenna tube is manually assembled (pressed) into the housing, (b), three contact clips that are gold platted are placed on the PCB using a pick-and-place machine, (c), the populated PCB is manually placed into the unit housing which allows the antenna tube to contact the gold clips, (d), the antenna is inserted into the antenna tube as shown in Figures 2a and 2b.

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Page 1 of 3

Developments Technical 0 M MOlOROLA

SURFACE MOUNT ANTENNA TUBE

by Mohammad Khalid and Vahid Goudarzi

  The antenna designs in a radio or a cellular unit requires the antenna to be surrounded by an antenna tube as part of the RF and the Electrical require- ments as shown in Figure 1. The existing assembly process is performed as follows; (a) the antenna tube is manually assembled (pressed) into the housing,
(b), three contact clips that are gold platted are placed on the PCB using a pick-and-place machine, (c), the populated PCB is manually placed into the unit housing which allows the antenna tube to contact the gold clips, (d), the antenna is inserted into the antenna tube as shown in Figures 2a and 2b.

  The described process has a lot of disadvantages that could be summarized as follows:

  1. The current design requires a manual assem- bly for antenna tube into the housing. Manual assembly is a time consuming process, allows an opportunity for a human error, and a costly process from a labor perspective.

  2. Usually, there are three (3) or more contacts that are soldered to the PCB (usually costs 0.10 to
0.15 cents each) since they are gold plated in order to provide the appropriate grounding for the antenna tube.

  3. Usually, the three (3) golden contacts have six points where it contacts the antenna tube in the housing (Figure 3 on next page). It is required that a minimum of three points will make the actual con- tact, otherwise, the functionality of the unit might be effected. This is an opportunity for a defect that is a function of the machine and the manual process accuracy and tolerances.

Fig. 2a Fig. 2b

htenna Cellular or I+ Radio

Fig. 1

Populated PCB unit Housing

49 September 1999

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Page 2 of 3

Developments Technical 0 M MOTOROLA -

Fig. 3

  The following section of this article describes a newly invented design for the antenna tube (Surface Mount), thus, a new defined process that will allow an automated assembly for the antenna tube into the housing.

  As shown in Figure 4, there are two possible designs for a Surface Mount Antenna Tube. Design (4a) is a folded sheet with leads at three different locations. The two leads at each location are oppo- site to each other. The second design (4b) has the shape of Omega, and the sections at each side are a continuous ground. Both designs have the required characteristics and features in ord...