Quad-band Tunable Diversity Antenna with Switched Grounding
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Solution Overview
Problem
Conventional mobile units require multiple antennas and diversity antennas for different frequency bands, leading to increased hardware complexity, space constraints, and limited frequency support, especially in urban or indoor environments with multipath signal interference.
Innovation Solution
A combined diversity antenna configured as a planar inverted F-antenna with multiple portions and a switch, allowing operation across four frequency bands (two low-band and two high-band frequencies) within a single housing, enabling flexible frequency tuning and reduced hardware requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple main antennas are used for different operating frequencies, then the transceiver can transmit/receive signals in different networks, but the hardware complexity and space requirements increase
Solution Approach 1:
The patent implements a single main antenna that can operate across multiple frequency bands (GSM 850/1900, CDMA 800/1800, and cellular 800-900 MHz) by using frequency-selective surfaces and adjustable matching networks, eliminating the need for separate antennas for each network type
Solution Approach 2:
The patent combines multiple antenna functions into a single integrated antenna structure that handles both main signal reception and diversity signal reception across different frequency bands, reducing the total number of antenna components required
2Reliability
If multiple diversity antennas are used for different operating frequencies, then signal reliability improves in multipath environments, but the hardware complexity and space constraints are worsened
Solution Approach 1:
The patent implements a single diversity antenna that can receive diversity signals across multiple frequency bands by using frequency-selective surfaces and adjustable matching networks, eliminating the need for separate diversity antennas for each frequency band
Solution Approach 2:
The patent combines multiple diversity antenna functions into a single integrated antenna structure that handles diversity signal reception across different frequency bands, reducing the total number of antenna components required
3Device complexity
If the diversity antenna is configured for only select operating frequencies, then hardware complexity is reduced, but frequency support and adaptability are limited
Solution Approach 1:
The patent uses adjustable matching networks with variable capacitors and inductors that can be dynamically tuned to match different frequency bands, allowing the single diversity antenna to adapt its impedance matching for optimal performance across GSM 850/1900, CDMA 800/1800, and cellular 800-900 MHz bands
Solution Approach 2:
The patent changes the electrical parameters of the antenna system by using frequency-selective surfaces and adjustable matching networks that modify the antenna's resonant frequency and impedance characteristics to support multiple frequency bands with a single antenna structure
Data Source
AI summary
An electronic device includes a main antenna and a diversity antenna. The diversity antenna includes a first portion configured to enable a transceiver to receive a signal in a first low-band frequency of four frequency bands. A second portion enables the transceiver to receive a signal in first and second high-band frequencies. A third portion is RF coupled to the first portion when the third portion is connected to ground. The third portion tunes the first portion such that the transceiver receives a signal in a second low-band frequency. A switch is connected between the third portion and the ground. When the switch is open, the first portion enables the transceiver to receive the signal in the first low-band frequency. When the switch is closed, the third portion tunes the first portion to enable the transceiver to receive the signal in the second low-band frequency.