Tunable Multi-Band Antenna Using PIN Diode Switches
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional multi-band antenna systems for wireless communication devices are bulky due to the need for multiple antennas, band pass filters, and RF circuits to support diverse frequency bands, increasing device size.
Innovation Solution
A tunable antenna system featuring a substrate with a radiating unit, a slot, and a feed unit, where a switch adjusts the configuration to resonate in multiple frequency bands when turned on and a single frequency band when turned off, utilizing a PIN diode for connectivity, allowing for miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional multi-band antenna system uses multiple antennas, band pass filters, and RF circuits to support diverse frequency bands, then the frequency band coverage is improved, but the device size increases
Solution Approach 1:
The patent merges multiple antenna elements (first and second radiating units) into a single integrated antenna structure that can operate across multiple frequency bands. The radiating units are coupled together and share common ground connections, eliminating the need for separate antennas for different bands. This combining approach maintains multi-band functionality while significantly reducing the overall device volume compared to conventional systems that use separate antennas for each frequency band.
Solution Approach 2:
The antenna design implements universality by creating a single antenna system that can universally operate across multiple frequency bands (e.g., GSM 900, GSM 1800, PCS 1900, and WLAN 2.4/5 GHz bands). The radiating units are designed with specific geometries and coupling arrangements that enable them to resonate at multiple frequencies simultaneously, allowing one antenna structure to perform the function of what would traditionally require multiple specialized antennas.
2Adaptability or versatility
If a conventional multi-band antenna system uses multiple antennas and RF circuits, then the frequency band adaptability is improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple RF circuits into a single integrated circuit that handles signal processing for all frequency bands. The circuit includes amplifiers, filters, and switching elements that are integrated together to manage multiple bands without requiring separate discrete components for each band. This merging of RF circuits reduces the number of components, simplifies the bill of materials, and reduces overall system complexity while maintaining the ability to support diverse frequency bands.
3Adaptability or versatility
If the feed unit area is adjusted using switches to configure multiple frequency bands, then the frequency tuning capability is improved, but the device complexity increases
Solution Approach 1:
The patent employs PIN diodes as switches to dynamically reconfigure the antenna structure and feed unit area based on the desired operating frequency band. These diodes can be rapidly switched between conductive and non-conductive states to change the effective electrical length and area of the radiating units. This dynamic reconfiguration capability allows the antenna to adapt its resonant frequencies in real-time, providing frequency tuning capability while using simple binary switching control rather than complex mechanical adjustments.
Solution Approach 2:
The invention changes the electrical parameters of the antenna by adjusting the feed unit area and the state of the PIN diode switches. By varying the conductive state of the diodes, the effective area and electrical length of the radiating units are modified, which directly changes the resonant frequency parameters. This parameter change approach enables frequency tuning through simple electrical control rather than mechanical reconfiguration, reducing control complexity.
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
Enables operation in multiple frequency bands with a compact design, reducing device size while allowing easy frequency tuning, suitable for handheld devices.
Implementation Method 1
a radiating unit formed on the first surface of the substrate; a slot formed by the radiating unit that is closed at one end and open at the other end
Implementation Method 2
a feed unit formed on the second surface of the substrate in an area that corresponds to an area on the first surface of the substrate between the center of the length of the slot and the closed end of the slot
Implementation Method 3
The feeding unit may comprise at least one switch to configure the size of an area of the feed unit. The switch may be a Positive Intrinsic Negative (PIN) diode.
Data Source
AI summary
A multiple frequency band antenna is provided that includes a radiating unit having a slot formed on a first surface of the substrate that is closed at one end and open at the other end, and a feed unit formed on a second surface of the substrate to pass through an area on the second surface that corresponds with the same area on first surface between the center and the closed side of the slot. The feeding unit comprises at least one switch which adjusts the size of an area for feeding power to the antenna. The radiating unit is resonated in a plurality of frequency bands when the switch is turned off, and the radiating unit is resonated in a single frequency band which is different from the plurality of frequency bands when the switch is turned on. Consequently, an antenna is implemented for use in multiple frequency bands.