CN201741799U

CN201741799U - Low profile on-board comprehensive hole diameter navigation antenna

Info

Publication number: CN201741799U
Application number: CN2010202994926U
Authority: CN
Inventors: 吴建锋; 郑会利; 傅光
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-08-21
Filing date: 2010-08-21
Publication date: 2011-02-09
Anticipated expiration: 2020-08-21

Abstract

The utility model relates to a low profile on-board L waveband navigation antenna. The utility model has an inverted cone-shaped structure formed by using eight broken line-shaped metal rods, thereby the upper part is uniformly distributed around the periphery and welded with the round metal top loading plate, the lower part is together formed and welded with the feed probe, and on the periphery of the top loading plate are uniformly disposed four short circuit columns for connecting the loading plate and the floor. By using the inverted cone-shaped structure and the top loading plate, the height of antenna can be lowered, and the frequency band can be widened. The antenna frequency band is in a range of from 870 to 1200MHz, which is characterized of the vertical polarization and the horizontal omni-directional radiation, and can satisfy the navigation communication requirements of L wave band of the airplane.

Description

The airborne aperture synthesis of low profile navigation antenna

Technical field

The utility model relates to a kind of low profile airborne antenna, and this antenna applications is in the navigation communication of aircraft L-band.

Background technology

Be loaded into the antenna structure on the high-speed mobile equipment, particularly aircraft, its function and performance are different from general engineering structure, and it not only requires the electrical property of antenna good, and require to satisfy all restrictions on overall dimension and the mounting condition.At present, the antenna that loads on the aircraft requires to be low profile, broadband character, requires the antenna aeroperformance good, and the volume of equipment is reduced, and can be embedded into internal body, improves the aircraft scattering properties, and is therefore more and more higher for the designing requirement of low profile antenna.And current this class antenna is often got compromise value between antenna size and gain, bandwidth, and its performance of She Ji antenna is not good like this.Also having a class antenna is improved slightly antenna form on basic doublet basis, as taper, discone antenna etc., this class antenna is than the obvious broadening of doublet antenna bandwidth, volume reduces relatively, but it is still bigger to be applied to its volume of airborne equipment, if directly reduce antenna size, its just corresponding reduction that gains with bandwidth, and these antenna structure is comparatively complicated, and is very high to the processing technology requirement, is difficult to volume production.

Summary of the invention

In order to satisfy the requirement of Airplane Navigation Equipment to low profile antenna, the utility model provides a kind of structure simple relatively, covers the broadband aperture synthesis navigation antenna of L-band, and its radiance is good, antenna height is relatively very low, is particularly suitable for using as airborne navigation antenna.

The technical scheme in the invention for solving the technical problem is: the metal bar of using 8 broken line shapes of cluster, surround the structure of a back taper, the upper metal rod evenly distributes around circumference, the polymerization of lower metal rod welds together, and be connected with upright probe, form the structure of a back taper cage modle discretization like this, this structure can enlarge markedly the working band of antenna.The top of antenna adopts the metal circular top board to load, and 8 broken line shape metal bar tops are welded with loading top board, and the use that loads top board has reduced the height of antenna greatly, and this is highly profitable to the design low profile antenna.In order to satisfy omni-directional and the matched impedance on the antenna horizontal direction, evenly place four short circuit posts loading the top board position that keeps to the side, on connect the loading top board, following ground plate.The antenna feed mode adopts 50 ohm of coaxial feedings, and exocuticle connects floor, heart linking probe.

Useful benefit of the present utility model is that antenna structure is simple, is easy to process volume production; Antenna frequency band broad covers 0.8～1.2GHz, and each frequency matching status is good, and antenna height obviously reduces, and can reach 1/12nd of wavelength, can reach the designing requirement of airborne antenna low profile; The horizontal direction vertical omnidirection is good, and gain can be satisfied airborne L-band navigation communications applications greater than 0dB.

Description of drawings

Below in conjunction with drawings and Examples the utility model is further specified

Fig. 1 is a structural representation of the present utility model

Wherein: 1. top load plate; 2. short circuit post; 3. broken line metal bar; 4. floor; 5. feed probes; 6. structure connection welding.

Fig. 2 is the vertical section structure schematic diagram of Fig. 1

Wherein: 1. top load plate; 2. short circuit post; 3. broken line metal bar; 4. floor; 5. feed probes; 6. structure connection welding; 7. coaxial line connectivity port; 8. hold-doun nut.

Embodiment

In Fig. 1, make eight broken line shape metal bars (3), on top board, evenly be distributed eight apertures, the broken line structure is inserted top solder joint (6) welding of aperture from top board around circumference, four apertures are also evenly opened in periphery at top board, and four short circuit posts (2) are inserted and welding.Then the bottom polymerization of broken line structure is got up and weld with probe (5).

In Fig. 2, corresponding short circuit post on the floor is opened four holes, and a mouth is also opened in the center, and the short circuit post is inserted in the hole, and is outside fastening with nut (8).Probe is positioned over the top of centre bore, with the inner core welding of probe and coaxial feed joint (7).

Claims

1. the airborne aperture synthesis of low profile navigation antenna, by the floor, the back taper cagelike structure, top load plate and short circuit post are formed by connecting, and work in L-band, it is characterized in that: adopt the back taper cagelike structure, have short-circuit line to be connected between the metallic plate top loading technique, top load plate and floor, antenna height is low, the frequency band broad, the horizontal direction omnidirectional radiation.

2. according to the airborne aperture synthesis of right 1 described low profile navigation antenna, it is characterized in that utilizing eight broken line shape Metallic rod to surround the cagelike structure of a back taper, weld around the even dispersion of circumference and with the top load plate on top, and the bottom condenses together and connects feed probes.

3. according to the airborne aperture synthesis of right 1 described low profile navigation antenna, it is characterized in that having utilized metal disk shape top load plate, and the even four short circuit posts that distribute connect top load plate and floor at its edge.