MULTICHANNEL ABSORBERLESS NEAR FIELD MEASUREMENT SYSTEM
First Claim
Patent Images
1. An absorberless near field microwave scanning system comprising:
- (a) a switched array of antenna elements embedded in a dielectric, for sensing electromagnetic field components at pre-determined locations, and forming an array surface, wherein said array outputs raw uncorrected signals which are indicative of the electromagnetic field and which include mutual coupling effects;
(b) a scan surface for placement of the device under test (DUT), wherein the scan surface is substantially parallel to the array surface and separated by a distance less than about 1/1.8th of the wavelength of the measured frequency;
(c) a processing engine operatively connected to the switched antenna array for obtaining and processing the array output, said processing engine adapted to correct at an individual probe level for mutual coupling effects, and said processing engine comprising;
i. a controller,ii. a channel selector and sampler,iii. a channel corrector, to adjust for differential path losses and delaysiv. a data translator and interpolator,v. an amplitude and phase detector,vi. a near field corrector,vii. a transformer for transforming the near field data to far field data, andix. a user interface.
2 Assignments
0 Petitions
Accused Products
Abstract
A near field microwave scanning system includes a switched array of antenna elements forming an array surface, a scan surface substantially parallel to the array surface and separated by a distance less than about 1 wavelength of the measured frequency, and a processing engine for obtaining and processing near field data, without the use of an absorber.
-
Citations
13 Claims
-
1. An absorberless near field microwave scanning system comprising:
-
(a) a switched array of antenna elements embedded in a dielectric, for sensing electromagnetic field components at pre-determined locations, and forming an array surface, wherein said array outputs raw uncorrected signals which are indicative of the electromagnetic field and which include mutual coupling effects; (b) a scan surface for placement of the device under test (DUT), wherein the scan surface is substantially parallel to the array surface and separated by a distance less than about 1/1.8th of the wavelength of the measured frequency; (c) a processing engine operatively connected to the switched antenna array for obtaining and processing the array output, said processing engine adapted to correct at an individual probe level for mutual coupling effects, and said processing engine comprising; i. a controller, ii. a channel selector and sampler, iii. a channel corrector, to adjust for differential path losses and delays iv. a data translator and interpolator, v. an amplitude and phase detector, vi. a near field corrector, vii. a transformer for transforming the near field data to far field data, and ix. a user interface. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. A method of measuring and testing a performance parameter of an electromagnetic radiating device, said method comprising the steps of:
-
(a) using a switched array of antenna elements forming a substantially parallel or non parallel array surface; (b) using this array scan surface, wherein the scan surface is substantially parallel to the array surface and separated by a distance less than about ½
wavelength of the measured frequency;(c) generating near field data by receiving output from the switched antenna array which is indicative of an electromagnetic field but includes mutual coupling effects; (d) correcting the near field data to correct at an individual probe level for mutual coupling effects; and (e) transforming the corrected near field data to far field data. - View Dependent Claims (8, 9, 10, 11, 12, 13)
-
Specification