Dipole antenna for portable radio

• US 4,590,614 A
• Filed: 01/16/1984
• Issued: 05/20/1986
• Est. Priority Date: 01/28/1983
• Status: Expired due to Fees

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Erat, August
• Primary Examiner(s): Ng, Jin F.
• Application Number:
  US06/571,078
• Time in Patent Office: 855 Days
• Field of Search: 455/269, 455/270, 455/349, 455/351, 455/90, 455/193, 455/128, 343/702, 343/793, 343/873, 343/794, 343/795
• US Class Current: 455/270
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 1/27 Adaptation for use in or on movable bodies H01Q1/08, H01Q1/12, H01Q1/18 take precedence

Abstract

A dipole antenna for a portable radio is contained completely within the insulated housing (10) of the transceiver. The dipole antenna is formed as two conductive surfaces (12, 13) electrically isolated from each other but disposed on the same printed circuit board (11) of the transceiver circuit which supports the circuit modules (14, 15). The two dipole halves are connected to each other by means of a dipole tuning circuit (29). The conductive tracks (23, 26, 27) of the transceiver circuit are interrupted at a location which divides as few tracks as possible. The interrupted tracks are bridged together by high-impedance resistors (22).

Claims

1. A dipole antenna for a portable radio comprising an insulated housing, in which is disposed a printed circuit board supporting high-frequency (14,15) and low-frequency (16,17) elements, said circuit board having conductive tracks and conductive surfaces thereon,

the conductive tracks and surfaces (12,13) as well as the high-frequency and low-frequency elements (14, 15, 16) are located on two separate regions of said circuit board, electrically isolated and divided from each other, each forming a dipole half (18,19),

a dipole tuning circuit (29) for electrically connecting

the conductive surfaces of the dipole halves (18,19), and high-impedance resistance means (22) for connecting the high-frequency elements (14,15) on one region (13) with the low-frequency elements (16,17) on the other region (12).

2. The dipole antenna of claim 1, wherein the electrical division between the two dipole halves (18, 19) is selected such that a minimum of conductive tracks are interrupted.

3. The dipole antenna of claim 1, wherein the high-frequency elements include a demodulator (15) and the low-frequency elements include a low-frequency amplifier (16);

and

said electrical division is between the output of the demodulator (15) and the input of the low-frequency amplifier (16).

4. The dipole antenna of claim 1, wherein a positive terminal (33) of a battery (30) is connected with a first solder terminal (34) isolated from, but disposed within, a first dipole half (19) which is connected by means of a coil (35) with a second solder terminal (36) disposed within, but isolated from, a second dipole half (18), and in which the negative terminal (39) of the battery is connected directly to a conductive surface (13) of said first dipole half (19), and with a conductive surface (12) of the other dipole half (18) by means of a second coil (40) of the dipole tuning circuit.

5. The dipole antenna of claim 4, wherein said coil (35) between said solder terminals (34, 36) and said second coil (40) of said tuning circuit (29) are formed as a single double-wound coil.

6. The antenna of claim 1, wherein said printed circuit board comprises an insulating substrate bearing said conductive surfaces on one face thereof and conductive tracks on its other face for connecting said high-frequency and low-frequency elements.

7. The dipole antenna of claim 1, wherein some of said high-frequency and low-frequency elements have shielding housings which contribute to the formation of said dipole halves (18,19).