Do you have the time and budget to develop a circularly polarized antenna in an anechoic chamber?
Continuous transmission is one of the main objectives when designing an antenna for portable devices. Transmitting and receiving antennas’ polarization match is crucial to minimize the transmission losses. Circularly polarized antennas are becoming more popular in the wireless industry as they offer more flexibility in the angle between transmitting and receiving antennas to achieve this polarization match. Axial ratio is the key to achieve this polarization match.
In order to achieve circular polarization at the desired frequency, the transmitter and the receiver should have the same axial ratio. This requirement can be accomplished by evaluating different shapes and dimensions of patches like square, rectangular, circular, triangular and sizes or by inserting different shapes and the dimensions of perturbation elements or by embedding different dimensions of slots or slits in the patch.
Substrate, the layer between the patch and the ground, is another item to consider when designing a circularly polarized antenna. The antenna performance towards the desired circular polarization specs can be enhanced by testing various substrate materials and specifications. Substrate thickness can be modified to ensure that the surface waves are suppressed for better antenna efficiency.
Feeding techniques is another consideration in designing circularly polarized antennas. Single feed or dual feed can be evaluated to get the desired input impedance and radiation pattern to achieve the intended circular polarization.
There are so many alternatives to consider when designing a circularly polarized antenna. And every time one of these options is implemented, the prototype needs to be tested to ensure that desired circular polarization specs are achieved. Testing a prototype in an anechoic chamber throughout the design and development stage can prove to be excruciatingly long and overwhelmingly expensive.
Determine proper alignment of antennas for maximum signal strength and characterize CP antennas in less than a second!
With CP Analysis option, RFxpert calculates Right-Hand Circular Polarization (RHCP), Left-Hand Circular Polarization (LHCP) and graphs Axial Ratio (AR) patterns in sub-second.
Having access to both the left-hand and right-hand patterns can be used to identify the orientation of the circular polarization as well. This feature will allow designers of circularly polarized antenna to characterize the effectiveness of their design in seconds.
RFxpert presents test results in four hemispherical views (Combined, RHCP, LHCP, and Axial Ratio), four Bisection views (Combined, RHCP, LHCP, and Axial Ratio), and two Bisection Cut views combining the Combined, RHCP and LHCP patterns. These views can be displayed in either Polar or Cartesian modes.
Below are the sample test results of a 2.4 GHz RHCP antenna
RFxpert is the only compact bench-top scanner that can evaluate CP antennas as you prototype them in your own lab environment in real-time. RFxpert gives you the ability to expedite your development cycle and reduce your time to market. To learn more about how to design and characterize CP antennas better click the “Demo Video” button at the bottom of the page.