Just as cellular replaced satellite, wimax is poised to replace cellular in applications such as automated meter reading and backhaul of remote plants and networks. Contact us to discuss your application. Our experienced team will custom-build your design using the best-in-class equipment and industry best-known-methods.
Advanced Search E-store. Discuss in Forums user community Contact Us for Assistance. Optimized for MIMO space time processing. Maximum null fill below the horizon. Cushcraft's newest addition to the high performance broadband wireless access base station antenna series, the JDN is designed to operate in the 3.
While exhibiting. The JVN 3. Extremely low side lobes, null fill below the horizon and uniform energy distribution within the coverage area are achieved thanks to Cushcraft's highly skilled engineering staff and the utilization of our proprietary Artificial Intelligence RF Optimizing development tool. Cushcraft 's suite of high performance sector antennas feature proprietary design elements resulting in extremely high levels of system performance and ruggedness while maintaining very slim profiles with low wind and ice loading.
WiMax Antennas for 2. Quick Links. WiMax Radio's. Lightning Protection. The 2. Thus, a spurious effect is minimized which eventually increasing the antenna efficiency.
Figure 2 a illustrates a simulated geometry of the three radiating elements on the upper substrate. Meanwhile, the lower substrate deployed on both sides consists of aperture slots and spiral feed line as indicated in Figures 2 b and 2 c , respectively.
Working principle of the proposed antenna aperture coupled feeding shows that the optimum dimension and position of aperture slot is ultimately crucial. This determines the amount of power transferred from the antenna spiral feed line to the radiating element. Hence, the reflected power at the source is minimized. Therefore, the performances of the proposed antenna such as gain, efficiency, and radiation pattern are preserved to be optimal.
Presented antenna implemented a rectangular aperture slot with dimension of The slots dimension can be obtained by resolving the following [ 1 , 17 ]:. As shown in Figure 2 c , the switchable antenna is achieved by integrating the RF switches to the antenna spiral feed arm S-Arm instead of the radiating element. This helps to minimize power deteriorations by the introduction of the surface mount component SMC [ 10 , 11 , 14 — 16 ].
In contrast, the OFF state condition causes gap between the middle line and the respective S-Arm which lead to no current flow through the gap. Such circuit configuration can be considered as circuit maker or a circuit breaker. This concept is proven through simulation by representing R-RF switches with a copper strip line or a touchstone TS block.
TS denoted as SnP file is an ASCII text file used for documenting the n -port network parameter data of an active device or passive interconnect network. Based on the simulation result, the antenna performance can be predicted before the optimized antenna design is fabricated with the surface mount component SMC.
Figures 3 a and 3 b show the schematic diagram of the TS implementation to the antenna. Such configuration is depicted in Figure 3 where the source port defined as port 1, switch A as port 2 diode ON state , switch B as port 3 diode ON state , and switch C as port 4 diode ON state. Figure 4 illustrates the comparison of the result of the antenna with TS and antenna with copper strip line.
Besides, the second harmonic of TS technique is bigger compared to the copper strip line. Moreover, the impedance matching for TS is better compared to the copper strip line. Overall, the performance of both techniques is slightly different due to some power excited has been absorbed by the PIN diode.
Figure 5 shows the fabricated antenna with integration of RF switching circuit into its spiral feeding network. The DC source is inserted to the inductor that performed as a short circuit.
However, the capacitor only allows the alternating current AC to pass through instead of choke the DC. The DC supply of 5 volts is induced through the white wire and shorted to the ground via the black wire. As depicted in Figure 6 , the antenna under test AUT performs as a transmitter, and a double ridged horn antenna functions as a receiver.
With certain R-RFS configuration, the return loss of 2. A sufficient interelement spacing IES of the proposed antenna for three R-RFS arrangements is proven through the surface current distribution. Less current has been attracted to the adjacent radiating element number one. Figure 8 b depicts that all radiating elements functioned properly after receiving a number of excited currents from the SMA port. Radiating element number two has approximately null current distribution as shown in Figure 8 c.
This leads to more current surge in the elements number one and three. Figures 9 and 10 depict the simulated 3D and measured radiation pattern of the PIN diode switches configuration. It is realized in both figures that the pattern is radiated on the - axis at the resonant frequency of 2.
The proposed antenna achieved the reconfigurable pattern by controlling the R-RFS switches with the implementation of the spiral feed arm design. Moreover, the main lobe radiation can be tuned to the desired direction with certain R-RFS configuration as summarized in Table 1. The high gain measurements and simulations of the proposed antenna can be attributed to the good coupling from the feed line to the radiating surface through the appropriate size, position, and shape of aperture slots.
The measurements show a very good agreement with simulations where the radiation patterns are formed successful with respect to the directional and divisive broadside beam characteristics.
Figures 10 a and 10 b show the measured polar directional radiation pattern with the normalized value. It is realized that the directional beam has a better peak gain of 3. WiMAX is a relatively new wireless technology that is gaining ground in many countries around the world, and new antennas are needed for it every day. It is similar to wireless broadband also known as WiFi , except that it is able to transmit signals for longer distances and can send and receive greater amounts of data more quickly than on traditional WiFi networks.
However, other countries are also jumping on this bandwagon as they discover the ease and convenience of having a WiMAX network available. As more nations use it and more customers are exposed to it, prices are starting to come down and will continue to come down in the future. To be the world leader in passive Multi-Polarized Antenna Technology by offering products and solutions which provide all users the best possible wireless experience at any frequency. Multi-polarized antennas for WiMAX frequencies and networks.
Surface Mount Antennas Surface mount antennas for are usually installed on a metal surface or ground plane such as vehicle roof, trunk, or dashboard. Our Mission.
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