Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method and apparatus for predictably switching diversity antennas on signal dropout

An antenna and signal technology, applied in the field of diversity antenna switching system

Inactive Publication Date: 2002-07-17
SHURE INC (US)
View PDF8 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

PIN diodes will direct RF energy when forward biased

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0012] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0013] Figure 1 shows a schematic diagram of a preferred embodiment of a diversity receiving device for coupling a radio frequency signal from at least one of a pair of such antennas to a radio receiver for demodulation. Diversity receiving device 100 consists of two wireless antennas 102 and 104 that detect signals transmitted from transmitters not shown. Although antennas 102 and 104 are only shown schematically in FIG. 1, in order to improve signal reception, the actual antennas are preferably spaced as far apart as practical.

[0014] The first antenna 102 has a capacitive coupling 112 with the cathode of the first PIN diode 106 . The anode of the first PIN diode 106 is connected to a summing node 109, which is capacitively coupled 130 to the input end of the radio frequency receiver 110, which demodulates the radio frequency signal picked up by the antenna 102 and outputs an audio signal. The se...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A low-cost diversity antenna switching system and method is realized by controlling bias voltages on PIN diodes. By increasing the reverse bias voltage impressed upon a PIN diode, an RF signal impressed upon the diode is increasingly attenuated. As the PIN diode is forward biased to conduct in the forward direction, RF attenuation decreases. Two or more PIN diodes are used to increasingly attenuate signals from one antenna as attenuation of signals from another antenna is gradually decreased. The progression of the bias voltages is accomplished using a microprocessor that monitors a received signal strength indicator (RSSI) signal from a radio receiver. The RSSI is used to control which of two antennas are coupled into the receiver by predicting a signal fade.

Description

technical field [0001] The present invention relates to a diversity antenna switching system. In particular, the present invention relates to a low cost diversity antenna switching system for use with high fidelity audio equipment. Background of the Invention [0002] Diversity reception systems and diversity antennas are well known in the field of communications technology. Typically, diversity antenna systems are used to accommodate RF signal attenuation and multipath signal propagation anomalies that are prevalent in VHF and UHF frequencies. Signal attenuation and multipath signals can negatively affect RF signal reception, and by selectively picking one of two or more spatially separated antennas to pick up the signal, attenuation and multipath effects can be reduced. Multi-element antennas are often used with cellular phones and car radios. [0003] Multi-element antennas are also currently used with wireless telephone systems that include lo...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/08
CPCH04B7/0831H04B7/0802H04B7/0814H04B7/00
Inventor 马克·A·肯克尔埃德加·C·赖尔
Owner SHURE INC (US)
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com