Remotely Controlled Antenna with Programmable Gain
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Solution Overview
Problem
Broadcast television antennas face challenges in providing exceptional RF performance across multiple channels and frequencies while being compact, easy to install, and cost-effective, especially with the advent of HDTV which exacerbates existing issues of radio wave propagation and antenna design compromises.
Innovation Solution
An antenna system with a three-element log periodic array on a printed circuit board substrate, coupled with a programmable gain amplifier and a remote controller that allows for gain and direction adjustments, enabling remote control of the antenna's position and gain settings to optimize signal reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large multi-element log periodic antenna is used to improve RF performance and signal strength, then reception quality is improved, but the antenna size, installation complexity, and cost increase
Solution Approach 1:
The patent applies a motorized rotor mechanism that enables the antenna to dynamically rotate and adjust its orientation toward different broadcast stations. This dynamic positioning capability allows a compact antenna to achieve the signal strength and reception quality previously requiring large static antenna structures, resolving the contradiction between size and reception quality.
2Reliability
If an RF amplifier is added to boost signal strength, then reception quality in weak signal conditions is improved, but the television receiver may saturate on channels with strong signals
Solution Approach 1:
The patent incorporates an automatic gain control (AGC) system that continuously monitors signal strength and dynamically adjusts the RF amplifier's gain accordingly. When strong signals are detected, the AGC reduces amplifier gain to prevent receiver saturation; when weak signals are detected, it increases gain to improve reception quality. This feedback mechanism resolves the contradiction by enabling adaptive signal strength management.
3Ease of operation
If motorized antenna rotors and remote controls are added to improve operation convenience, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The patent implements an automatic station positioning feature where the system autonomously rotates the antenna rotor and adjusts gain settings based on signal strength measurements, eliminating the need for manual user intervention. The remote control provides simplified command interfaces for user-initiated adjustments. This self-service capability resolves the contradiction by automating complex operations while maintaining user convenience through simple remote commands.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system achieves improved RF performance across a wide frequency range, is physically compact, easy to install, and convenient to operate, addressing the limitations of existing antenna designs by providing adjustable gain and direction settings through a remote controller.
Implementation Method 1
a radio frequency amplifier coupled to receive and amplify the radio frequency signal to a gain level controlled through a gain control input
Implementation Method 2
a remote control receiver receives the control data and a controller is coupled to the gain control input and the remote control receiver
Data Source
AI summary
An antenna system for receiving radio waves and for operation in conjunction with a remote controller that transmits control data including gain state data. The antenna system includes an antenna that receives the radio waves and outputs a radio frequency signal and a radio frequency amplifier coupled to receive and amplify the radio frequency signal to a gain level controlled through a gain control input. A remote control receiver receives the control data and a controller is coupled to the gain control input and the remote control receiver. The controller couples the gain state data to the gain control input, thereby remotely controlling the gain level of the radio frequency amplifier. A remotely controlled antenna rotor is also taught.