Transit antenna

• US 4,395,713 A
• Filed: 11/16/1981
• Issued: 07/26/1983
• Est. Priority Date: 05/06/1980
• Status: Expired due to Fees

• Current Assignee: Antenna, Inc.
• Original Assignee: Antenna, Inc.
• Inventors: Nelson, Thomas E., Consor, Herbert A.
• Primary Examiner(s): Moore, David K.
• Application Number:
  US06/321,556
• Time in Patent Office: 617 Days
• Field of Search: 343/711-715, 343/850, 343/846, 343/847, 343/700 MS, 343/860, 343/861, 343/705-708, 343/895, 343/752, 343/748
• US Class Current: 343/713
• CPC Class Codes: H01Q 1/3275 mounted on a horizontal surface of the vehicle, e.g. on roof, hood, trunk
• CPC Class Codes: H01Q 1/42 Housings not intimately mechanically associated with radiating elements, e.g. radome
• CPC Class Codes: H01Q 9/065 Microstrip dipole antennas patch antenna H01Q9/0407
• CPC Class Codes: H01Q 9/42 with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Abstract

A transit antenna in which a grounded base is provided. A housing is mounted on the base. The chamber and base define a chamber. A substrate is fixed to the base. The housing and substrate have interconnected surfaces to maintain the substrate in substantially fixed orientation with respect to the base. Capacitively coupled antenna layers are in opposite faces of the substrate.

Claims

1. A mobile communication antenna comprising:

(a) a base at least a portion of which is conductive and adapted to be connected to an associated vehicle for grounding;

(b) an antenna substrate fixed to the base in spaced relationship, the substrate being a relatively thin body of insulating material with its major dimensions positioned longitudinally and transversely of the base;

(c) a housing connected to the base and together with the base defining a protected chamber in which the substrate is positioned, the housing and substrate including interconnected portions which coact to assist in maintaining the substrate in fixed spaced relationship with the base;

(d) two generally L shaped conductive antenna surfaces secured to opposed faces of the substrate;

(e) an electrical connector secured to the base in grounding connection with the conductive portion; and

2. (f) an antenna lead extending through the connector and capacitively connected to at least one of the conductive antenna surfaces.

4. The antenna of claim 2 wherein one of the conductive surfaces is a conductive signal sending and receiving surface forming a dipole having one end conductively grounded to said mounting surface.

6. The apparatus of claim 4 which comprises a third conductive surface in electrical communication with said first surface and mounted to the same substrate surface as said second conductive surface.

7. The apparatus of claim 4 wherein said substrate is substantially rectangular and positioned in an orientation substantially perpendicular to said base and wherein there are two L-shaped conductive signal sending and receiving surfaces affixed in a substantially superimposed relation to opposed surfaces of said substrate one having an end grounded to said mounting surface, an additional conductive surface is also affixed to said substrate to form a single feed capacitor for both sending and receiving surfaces.

3. A mobile communication antenna comprising:

(a) a base at least a portion of which is conductive and adapted to be connected to an associated vehicle for grounding;

(b) an antenna substrate fixed to the base, the substrate being a relatively thin body positioned transversely of the base;

(c) a housing connected to the base and together with the base defining a protected chamber in which the substrate is positioned, the housing and substrate including interconnected portions which coact to assist in maintaining the substrate in fixed relationship with the base;

(d) first and second conductive antenna surfaces secured to opposed faces of the substrate;

(e) an electrical connector secured to the base in grounding connection with the conductive portion; and

(f) an antenna lead extending through the connector and capacitively connected to at least the first conductive surface.

5. A mobile communication antenna comprising:

(a) a base at least a portion of which is conductive and adapted to be connected to an associated vehicle for grounding;

(b) an antenna substrate fixed to the base in spaced relationship, the substrate being a relatively thin body of insulating material positioned transversely of the base;

(c) a housing connected to the base and together with the base defining a protected chamber in which the substrate is positioned, the housing and substrate including interconnected portions which coact to assist in maintaining the substrate in fixed spaced relationship with the base;

(d) a first radiation sending and receiving conductive surface attached to said substrate;

(e) a second conductive surface attached to an opposed surface of said substrate;

the combination of said substrate, a portion of said first, and said second conductive surfaces forming a capacitor to transmit and receive radio frequency signals to and from said first surface, and

(f) a co-axial cable connector having an inner conductor connected conductively to said second surface and an outer sheath contact connected conductively to said first conductive surface and in grounding connection with said base.