CN101038984A

CN101038984A - Design for miniaturized GPS microstrip patch antenna

Info

Publication number: CN101038984A
Application number: CN 200710099066
Authority: CN
Inventors: 苗俊刚; 罗贤梁; 赵鑫; 刘东海; 白冰; 李凤琴; 郝立强
Original assignee: Beihang University
Current assignee: Beihang University
Priority date: 2007-05-10
Filing date: 2007-05-10
Publication date: 2007-09-19

Abstract

The invention relates to a design method of a miniaturized GPS microstrip patch antenna, which mainly includes the following contents: (1) modeling and simulating the antenna to obtain key performance parameters of the antenna; (3) The antenna is arranged in a limited space, in order to compress the size of the antenna, slots are made on the patch; (4) In order to further utilize the space, layered patches are used, which is realized in engineering, and the layers between the patches Connect with vias. The invention makes full use of the limited space on the handheld device, greatly compresses the size of the antenna itself, and at the same time ensures a certain low elevation angle performance, and is suitable for mass production in engineering, and meets the requirement of being equipped on a personal handheld terminal.

Description

A kind of design of miniaturized GPS micro-strip paster antenna

Technical field

The present invention relates to a kind of method for designing of miniaturized GPS micro-strip paster antenna.

Background technology

In recent years along with the development of digital consumer market, the GPS product is owing to provide Position, Velocity and Time information easily, and easy to use, price is suitable, so formed a large amount of new new products of using, enter rapidly in our daily life.But this also must require the GPS product to have breakthrough on volume, power consumption and price, could be accepted by the common people.

Nowadays, it is popular that the miniaturization of GPS chipset, high accuracy, low-power consumption have effectively promoted GPS, and gps antenna then becomes the performance bottleneck of user terminal.And in order to satisfy user's different demands, Antenna Design is diversified, such as multifrequency, and transceiver, miniaturization or the like.Research to the multi-form gps antenna of different frequency range both at home and abroad also emerges in an endless stream, so the gps antenna of designing miniaturisation high-performance has very strong using value.

In order to catch the small-signal that satellite sends, more requirements have been proposed antenna performance:

1) circular polarization.Owing to need carry out communication with satellite, consider the direction consistency that electromagnetic wave transmits and receives, must adopt circular polarization.Circular polarization can also suppress cloud and mist interference and anti-multipath reflection.

2) broad beam.Such omnidirectional antenna can receive in the above five degree visuals field of ground level aerial visible satellite signal of all days, satisfies navigation application.

3) gain and axial ratio.Satellite-signal on the low elevation angle can reduce error, and is therefore quite important.So require the gain at the low elevation angle of antenna can not be low, axial ratio can not be too high, could fully obtain signal like this, gives the enough processing leeway of receiver.

4) miniaturization.Be used for personal communication apparatus, antenna can not be too big.

For these reasons, need provide a kind of design, in the time of antenna miniaturization, every key property of antenna, as circular polarization, the low elevation angle, gain and axial ratio can access certain assurance.

Summary of the invention

Main purpose of the present invention just provides this miniature antenna, has guaranteed circular polarization, the low elevation angle, gain and axial ratio performance.

Because antenna applications is in handheld device, size and weight are all restricted.Require working frequency range about 1.2GHz, if the employing relative dielectric constant is 10 medium, the length of side of common patch size is just about 35mm.According to a preliminary estimate, must seek help from the more medium substrate or the form of reasonably slotting of high-k.Among the design, two layer medium is arranged, relative dielectric constant all is 10, and the upper strata paster is the square fluting, and lower floor's paster is square annular, and the levels paster is communicated with by the edge via hole.

Paster on the levels medium is processed respectively, between get final product by the epoxide-resin glue water cure, daub not on the metal covering guarantees fully to contact, and via hole can be played a role.

Working frequency range and has the bandwidth of 20M about 1.2GHz.Require to have good axial ratio characteristic in the bandwidth, single feedback is inadvisable.Here adopted the probe double-fed, simple and practical.The spacing of noticing the double-fed probe is very short, and this is that dielectric loss is low, the paster fluting is to the external manifestation of the input impedance influence of antenna.And notice that probe will be through the floor, so on the floor of antenna floor and feed circuit, the periphery of two probes all will be reserved insulation layer.

Working frequency range is about 1.2GHz, and no matter the relative dielectric constant of dielectric substrate is 6 or 10, and the size of corresponding little band merit parallel circuit is all bigger than normal.Among the design, adopted small-sized power splitter spare, feeding network is this designs, and compact dimensions makes full use of the space.

Description of drawings

Fig. 1: the vertical view of antenna

Fig. 2: the end view of antenna

Fig. 3: the feed circuit of antenna bottom

Embodiment

The radiant section of antenna is seen illustrated in figures 1 and 2.Paster 1 (1) and paster 2 (5) lay respectively at the front of medium 1 (2) and medium 2 (6).Paster 1 and paster 2 are communicated with by paster top edge via hole (4).The reverse side of medium 2 all keeps, and as the floor, the reverse side of medium 1 keeps the part that coincides with paster 2, and stamps abundant edge via hole all around.Two dielectric substrates are processed respectively, want stacked at last.Can adopt epoxy resin glue to solidify, middle no paster is partly coated thin layer glue, daub not on the metal covering, and after two substrates compressed, peripheral edge can be coated with on a little mucilage sealing.The relative dielectric constant of two layer medium all is 9, and the length of side is respectively 35mm and 24mm, and thickness is 3mm, and the upper strata paster is the square of fluting, and lower floor's paster is square annular.Two probes (3) are in order to connect paster 1 and base drive circuit (10).The insulation circle district that probe passes through is left in attention on floor (7).

The feed of antenna is partly seen Fig. 3.The relative dielectric constant of the medium substrate of feed circuit is 6, length of side 30mm thickness 1.5mm.The figure that just looks like of medium substrate processes, and reverse side keeps the floor.Device (12) length and width are about 14mm and 8.9mm, two termination probes of this four port devices, and two ends connect matched load (13) and signal input part (14) respectively in addition.The device bottom surface is ground plate (15), and enough via holes (16) are arranged above.After the probe alignment, feed substrate left-hand thread is on the antenna floor, and after compressing, the edge daub guarantees that two floors fully contact.

It will be appreciated by those skilled in the art that: under the prerequisite that does not deviate from broad scope of the present invention, can change the foregoing description.Thereby the present invention is not limited in disclosed specific embodiment, and its scope should contain core of the present invention and the interior all changes of protection range that appended claims limits.

Claims

1. a design method of miniaturized GPS microstrip patch antenna, is characterized in that, the method mainly comprises the following steps:

(1) Model and simulate the antenna to obtain the key performance parameters of the antenna;

(2) The feed network adopts small size devices;

(3) The antenna is arranged in a limited space, in order to compress the size of the antenna, slots are made on the patch;

(4) In order to further utilize the space, layered patches are used, and for engineering realization, the layered patches are connected with via holes.

2. The antenna design method as claimed in claim 1, characterized in that the modeling environment includes a layered structure, patch forms on each level, connectivity between layers, size and performance parameters of the medium, and feeding methods . Because it is difficult to manufacture small-sized microstrip power dividers in this frequency band, small-sized devices are used. In the simulation model, a pair of coaxial input terminals with equal amplitude and 90-degree phase difference can be used to replace the power splitter.

3. The antenna design method according to claim 1, characterized in that the upper patch is in the form of slots, the slot lines on the patch change the current path, and this current distribution can greatly compress the size of the patch. The lower patch is square and ring-shaped.

4. The antenna design method according to any one of claims 1-3, characterized by a layered structure, the patches on the two layers of media can be processed separately, and after combination, the upper and lower layers of patches are connected through edge vias.