a new test method for the electrical parameter deviation of gps antenna patches

The Eighth International Conference on Electronic Measurement and Instruments ICEMI’2007

A New Test Method for the Electrical Parameter

Deviation of GPS Antenna Patches

Liu Xueguan Guo Huiping Cai Wenfeng Cao Honglong

(RF Research Center , Soochow University, Suzhou 215021,China)

improve the productivity efficiency, a rapid test

method for the electrical parameter deviation of GPS

antenna patches is necessary deeply.

Abstract: The electrical parameter deviation of GPS antenna

patch base material is caused by the productive processes, and

it influences on the performance of GPS antenna. A rapid test

method for the electrical parameter deviation of GPS antenna

patches is proposed in this paper. The design principle and the

test apparatus are given in detail based on the stripline model.

The test result shows the proposed method is efficiency and the

test method is also convenient for large-scale manufacture.

There are two basic measurement methods for

dielectric constant of material: resonance cavity

method and microstrip line method[1][2].The resonance

cavity method need the suitable shape of under-test

sample and the working band is narrow and the

material shape is special, while the microstrip line

method need analysis the test model with complex

formula or using EM simulation. Here we design a

test apparatus, which based on stripline model. It can

distinguish the electrical parameter deviation of GPS

antenna patch caused by the productive processes in

deferent batch conveniently.

Keywords: dielectric constant; GPS antenna patch; test

apparatus; large-scale manufacture

1 Introduction

As the global position technology has been used

wider and wider, the requirement quantities of

microstrip GPS antenna are increased dramatically.

The GPS antennas are manufactured through four

important processes: patch model pressing, sintering,

printing and modifying. In the large-scale manufacture

situation, the productive processes of GPS patches

influence on the performance of GPS antenna strictly.

The powder and sintering temperature will determine

the electrical parameters of GPS patches, so the GPS

patches from different batch may have different

electrical parameters. If the electrical parameter

deviation of GPS antenna patches can be detected

before printing, it can increase the

exempt-modification rate efficiently. In order to

This paper is arranged as followings: the design

principle and the test apparatus are discussed in

section II, the test results are given in section III and

some conclusions are summarized in section IV.

2 Theory and Test Apparatus Design

2.1 equivalence transmission line of unsymmetrical

stripline

We first consider a length of unsymmetrical

stripline shown in Fig.1(a), where is the relative

dielectric constant of base material and is the

relative dielectric constant of the cover

material. are the size denoted in Fig.1(a).

1r

2r

tddw ,,, 21

2-471-4244-1135-1/07/$25.00 ©2007 IEEE.

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