GB2427310A - Receiving antenna for digital television - Google Patents

Receiving antenna for digital television Download PDF

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Publication number
GB2427310A
GB2427310A GB0512042A GB0512042A GB2427310A GB 2427310 A GB2427310 A GB 2427310A GB 0512042 A GB0512042 A GB 0512042A GB 0512042 A GB0512042 A GB 0512042A GB 2427310 A GB2427310 A GB 2427310A
Authority
GB
United Kingdom
Prior art keywords
antenna
casing
coaxial cable
flat
transmission line
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
GB0512042A
Other versions
GB2427310B (en
GB0512042D0 (en
Inventor
Chen-Si Wang
Cheng-Si Wang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Trans Electric Co Ltd
Original Assignee
Trans Electric Co Ltd
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 Trans Electric Co Ltd filed Critical Trans Electric Co Ltd
Priority to GB0512042A priority Critical patent/GB2427310B/en
Publication of GB0512042D0 publication Critical patent/GB0512042D0/en
Publication of GB2427310A publication Critical patent/GB2427310A/en
Application granted granted Critical
Publication of GB2427310B publication Critical patent/GB2427310B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/42—Housings not intimately mechanically associated with radiating elements, e.g. radome
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • H01Q9/26—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole with folded element or elements, the folded parts being spaced apart a small fraction of operating wavelength

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  • Details Of Aerials (AREA)

Abstract

A digital receiving antenna for connection to a digital television via an external co-axial cable 30. The antenna comprises a casing 10 enclosing a flat antenna element 20, a connector 11 passing through the casing for connection to the external cable 30, and an internal co-axial cable 23. The internal co-axial cable 23 provides a fixed capacitance for providing an impedance match between the flat antenna element and the antenna signal processing circuit. The inner conductor 231 of the internal co-axial cable is connected to the inner conductor of the connector, while the outer 232 of the cable is connected to the antenna element feed point 21. The outer conductor of the connector is connected to a ground point 22 of the antenna element.

Description

1 2427310
DIGITAL RECEIVING ANTENNA DEVICE FOR A DIGITAL
TELE VISION
1. Field of the Invention
The present invention relates to a digital receiving antenna device and more particularly to a digital receiving antenna device for a digital television.
2. Description of Related Art
Digital televisions require a digital receiving antenna device to receive digital program signais so the televisions can display the video and play the audio. For portable digital televisions, the digital receiving antenna device is particularly important to provide good quality of the program video.
With reference to Fig. 5, a small conventional digital receiving antenna device connects to the digital television (not shown) through a coaxial cable (60) and has a casing (50), a flat antenna (51) and first and second transmission lines (522, 523).
The flat antenna (51) is mounted in the casing (50) and has a feed point (A) and a ground point (B). The feed point (A) and ground point (B) are respectively connected to a core conductor (61) and a braided layer (62) of the coaxial cable (60) respectively through the first and second transmission lines (522, 523). Since impedance of the flat antenna (51) and the impedance of an antenna signal processing circuit (not shown) must be matched, the antenna signal can be completely transmit to the antenna signal processing circuit.
Therefor, in addition to the impedance of the flat antenna (5 1) and the antenna signal processing circuit, impedance of the first and second transmission line (522, 523) has to been considered.
Digital televisions have different sizes, and different sizes of digital receiving antenna devices are required. With further reference to Fig. 6, a conventional large passive digital antenna device has a large casing (50a), a large flat antenna (5 Ia) and a long first transmission line (522a) and a second transmission line (523). The large flat antenna (51a) has the same impedance as the smaller flat antenna (50) as shown in Fig. 5.
The flat antenna (50a) is a distance from the coaxial cable (60), which is longer than that of the smaller digital receiving antenna device (50).
Consequently, a longer first transmission line (522a) is required to connect between the large flat antenna (51a) and the external coaxial cable (60).
Therefore, a new impedance of the longer first transmission line (Sla) is generated and the antenna signal processing circuit is not adapted to use the large antenna device since the impedance no longer matches. In brief the large rectangular antenna needs to use a tailored antenna signal processing circuit.
Since different rectangular passive antenna devices do not use the same antenna signal processing circuit, fabricating cost of the passive digital antenna device will be increased.
The present invention provides a digital receiving antenna device that has a fixed impedance to overcome the problem with mismatched impedance with the antenna signal processing circuit in different size digital receiving antenna devices.
The main objective of the present invention is to provide a digital receiving antenna device with a fixed impedance to match the impedance of an antenna signal processing circuit.
A digital receiving antenna device is connected to a digital television through a coaxial cable and has a casing, a flat antenna, a coaxial cable connector and a coaxial transmission line. The flat antenna is mounted in the casing and connected electronically to the coaxial cable through the coaxial transmission line. Since the coaxial transmission line has a fixed capacitance without regard to the distance between the feed point and the coaxial cable connector, a fixed capacitor is connected between the flat antenna and the coaxial cable connector. Therefore, the coaxial transmission line can be used as a transmission line for different size flat antennas, and each coaxial transmission line will have the same impedance. These different size digital receiving antenna devices can use the same antenna signal processing circuit and still have an impedance match between the flat antenna and the antenna signal processing circuit.
IN THE DRAWINGS
Fig. 1 is an exploded perspective view of a digital receiving antenna device in accordance with the present invention; Fig. 2 is a perspective view of the digital receiving antenna device in Fig.l; Fig. 3 is a top view of the digital receiving antenna device in Fig. 1; Fig. 4 is a cross sectional view of a conventional coaxial cable; Fig. 5 is a top view of a conventional small digital receiving antenna
device in accordance with the prior art; and
Fig. 6 is a top view of a conventional large digital receiving antenna
device in accordance with the prior art.
With reference to Figs. I and 2, a preferred embodiment a digital receiving antenna device in accordance with the present invention has a casing (10), a flat antenna (20), a coaxial cable connector (11) and a coaxial transmission line (23).
With further reference to Fig. 3, the flat antenna (20) is mounted in the casing (10) and connected electronically to a digital television (not shown) through an external coaxial cable (30). The external coaxial cable (30) has a core conductor (31) and a braided layer (not shown). The flat antenna (20) has a feed point (21) and a ground point (22). The flat antenna (20) can be any shape, for example, rectangular, circular, straight, etc. The coaxial cable connector (11) is mounted through the casing (10), protrudes inside and outside the casing (10) and has an inner conductor (111) and multiple outer conductors (112). At least one outer conductor (112) is connected between the ground point (22) of the flat antenna (20) and the braided layer of the external coaxial cable (30) .
With further reference to Fig. 4, the coaxial transmission line (23) inside the casing (10) has a core conductor (231), a braided layer (232), insulating material and a fixed capacitance (C). The insulating material separates the braided layer (232) from the core conductor (231) by a fixed distance, which results in the fixed capacitance (C) between core conductor (231) and the braided layer (232). The core conductors (231, 31) of the coaxial transmission line (23) and the external coaxial cable (30) are electronically connected together through the inner conductor (11 1) of the coaxial cable connector (11). The braided layer (232) of the coaxial transmission line (231) is connected to the feed point (21) of the flat antenna (20). The braided layer of the external coaxial cable (30) is connected electronically to the ground point (22) through one of the outer conductors (112) of the coaxial cable connector (11).
Since the coaxial transmission line (23) mounted inside has a fixed capacitance, the capacitance is the same without regard to the distance between the feed point and the coaxial cabic connector. When the feed point (21) of the flat antenna (20) is connected electronically to the external coaxial cable (30) through the coaxial transmission line (23) mounted inside the casing (20), a fixed capacitance (C) is connected between the feed point (21) and the external coaxial cable (30). Therefore, a large digital receiving antenna using a coaxial transmission line to connect between the large flat antenna and the external coaxial cable has the same impedance as different size digital receiving antenna using a coaxial transmission line because the coaxial transmission lines have the same capacitance. Therefore, different size digital receiving antenna devices can use the same antenna signal processing circuit because the impedance of the flat antenna matches the antenna signal processing circuit.

Claims (6)

  1. CLAIMS: 1. A digital receiving antenna device, comprising: a casing (10);
    a flat antenna (20) mounted in the casing (10) and connecting electronically to an external coaxial cable (30), that is adapted to be connected to a digital television and has a core conductor and a braided, and the flat antenna (20) having a feed point (21); and a ground point (22); a coaxial cable connector (11) mounted through casing (10), protruding inside and outside the casing (10), connecting to the external coaxial cable (30) and having an inner conductor (11 1); and at least one outer conductor (112); and a coaxial transmission line (23) mounted inside the casing (10) and connected between the feed point (21) of the flat antenna (20) and the external coaxial cable (30).
  2. 2. The antenna device as claimed in clairni, wherein the coaxial transmission line (23) comprises: a core conductor (23 1) cormected to the external coaxial cable (30);and a braided layer (232) connected to the feed point (22).
  3. 3. The antenna device as claimed in claim 2, wherein the core conductor (231) of the coaxial transmission line (23) is connected to the inner conductor (lii).
  4. 4. The antenna device as claimed in claim 2, wherein the at least one outer conductor (112) is connected to the ground point (22) of the flat antenna (20).
  5. 5. The antenna device as claimed in claim 3, wherein the at least one outer conductor (112) is connected to the ground point (22) of the flat antenna (20).
  6. 6. The antenna device as claimed in claim 2, wherein the flat antenna (20) is rectangular.
GB0512042A 2005-06-14 2005-06-14 Digital receiving antenna device for a digital television Expired - Fee Related GB2427310B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0512042A GB2427310B (en) 2005-06-14 2005-06-14 Digital receiving antenna device for a digital television

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0512042A GB2427310B (en) 2005-06-14 2005-06-14 Digital receiving antenna device for a digital television

Publications (3)

Publication Number Publication Date
GB0512042D0 GB0512042D0 (en) 2005-07-20
GB2427310A true GB2427310A (en) 2006-12-20
GB2427310B GB2427310B (en) 2007-08-01

Family

ID=34855469

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0512042A Expired - Fee Related GB2427310B (en) 2005-06-14 2005-06-14 Digital receiving antenna device for a digital television

Country Status (1)

Country Link
GB (1) GB2427310B (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2207557A (en) * 1987-06-01 1989-02-01 Leader Radio Co Ltd Antenna
US5940037A (en) * 1997-04-29 1999-08-17 The Whitaker Corporation Stacked patch antenna with frequency band isolation
US5999141A (en) * 1997-06-02 1999-12-07 Weldon; Thomas Paul Enclosed dipole antenna and feeder system
DE202005001041U1 (en) * 2005-01-27 2005-03-31 Trans Electric Co Room antenna has base has a base plate and an assembly plug-in device corresponding to fixing guides protruding from base plate so plate can be connected to base in stable but releasable manner in two mutually perpendicular positions

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2207557A (en) * 1987-06-01 1989-02-01 Leader Radio Co Ltd Antenna
US5940037A (en) * 1997-04-29 1999-08-17 The Whitaker Corporation Stacked patch antenna with frequency band isolation
US5999141A (en) * 1997-06-02 1999-12-07 Weldon; Thomas Paul Enclosed dipole antenna and feeder system
DE202005001041U1 (en) * 2005-01-27 2005-03-31 Trans Electric Co Room antenna has base has a base plate and an assembly plug-in device corresponding to fixing guides protruding from base plate so plate can be connected to base in stable but releasable manner in two mutually perpendicular positions

Also Published As

Publication number Publication date
GB2427310B (en) 2007-08-01
GB0512042D0 (en) 2005-07-20

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20110614