Patch Antenna Layout for Stable Polarization MIMO in Mobile Housings
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Solution Overview
Problem
Existing communication systems using millimeter waves face challenges in maintaining effective polarization MIMO due to changes in position or orientation of portable devices, leading to varying direct wave paths and increased reflection loss.
Innovation Solution
A communication apparatus is designed with patch antennas positioned to accommodate varying orientations and positions, allowing for the transmission and reception of multiple polarized waves with different polarization directions, enhancing communication performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional mobile phone is used, then communication functions are provided, but radiation exposure to the user's head increases due to proximity
Solution Approach 1:
The communication device is divided into two separate units: a base unit that remains stationary and a portable unit that the user carries. This segmentation allows the radiation-generating components to be located in the base unit while the user only carries the receiving display unit, thereby reducing radiation exposure to the user's head while maintaining communication convenience.
Solution Approach 2:
A wireless communication link acts as an intermediary between the base unit and portable unit. This allows data transmission without direct physical contact or close proximity between the user and the radiation-generating components, reducing harmful radiation exposure while enabling seamless communication functionality.
2Reliability
If transmission power is increased to improve communication quality, then signal strength improves, but battery consumption increases
Solution Approach 1:
The transmission power is dynamically adjusted based on communication conditions. The base unit, which has access to power outlets, can transmit at higher powers when needed, while the portable unit conserves battery by receiving signals and only transmitting at lower powers when necessary, thus maintaining communication quality while optimizing battery consumption.
Solution Approach 2:
The system combines a powered base unit with an unpowered or minimally powered portable unit. The base unit handles high-power transmission functions, while the portable unit focuses on receiving and displaying information, thereby achieving reliable communication quality without requiring the portable unit to consume excessive battery power.
3Reliability
If antenna size is increased to improve reception, then signal reception improves, but device portability deteriorates
Solution Approach 1:
The antenna system is segmented between the base unit and portable unit. The base unit, which remains stationary, can accommodate larger antennas for optimal signal reception and transmission. The portable unit uses a smaller antenna designed for portability, relying on the base unit's larger antenna to compensate for reception needs, thus achieving good signal reception without compromising device portability.
Data Source
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AI summary
To realize polarization MIMO in a more suitable form in a mobile communication apparatus. A communication apparatus includes a plurality of antenna parts configured to receive or transmit a wireless signal, a communication control part configured to control transmitting or receiving the wireless signal via at least any of the plurality of antenna parts, and a casing housing the communication control part, in which each of the plurality of antenna parts is held near each of a plurality of partial regions normal directions of which cross each other or the normal directions of which are mutually twisted in outer faces of the casing, and transmit or receive a first wireless signal and a second wireless signal propagating in directions substantially orthogonal to the partial regions and having mutually different polarization directions.