Dual‐band dual‐polarized microstrip antenna at S‐ and X‐bands using feed technique for suppression of interference due to higher order modes

Abstract

This paper presents a novel configuration for dual band dual polarized (DBDP) microstrip antenna (MSA) at S‐and X‐bands. The antenna at S‐ and X‐bands with high frequency ratio between the two bands utilizes the proposed configuration which uses the MSA at S band as ground for 2 × 2 MSA array at X‐band, thereby making it compact. It simultaneously achieves better gain, bandwidth, radiation pattern stability and good isolation. The proposed DBDP antenna configuration overcomes the issue of interference between higher order mode due to first frequency with second frequency using proposed feed technique. It uses electromagnetic coupling (EMCP) technique to give measured bandwidth (∣S11∣0.62em≤ −10 dB) from 2.3 to 2.6 GHz (12.2%) at S band and from 7.8 to 8.3 GHz (6.2%) at X‐band. The measured isolation between the two orthogonal ports is better than 28 dB at 2.5 GHz and 32 dB at 8.2 GHz. The gain at 2.5 GHz is 7.4 dBi and at 8 GHz, it is 10 dBi. Such an antenna can be used for telemetry, tracking and command application in satellite communication, etc.

Analysis and Design of a High Gain Multiband Antenna Based on Metamaterials for RFID Applications

“…Table 5 contains a detailed comparison of the proposed antenna with other recent multiband antennas for similar applications. When evaluating the performance, it is noticeable that the gain of the microstrip antennas in the UHF band is at most 6 dB [11][12][13][14][15][16]. Unfortunately, this is not an excellent result, as it can lead to losses in network coverage, especially for RFID, which limits their practical application.…”

“…In [11], a three-port triband antenna with slot-coupled feed technique on three-layer substrates for radio frequency identification (RFID) is presented. Similarly, multiband patch antennas with feed technique implemented on twolayer substrates [12][13][14] and three-layer substrates [15] are proposed for wireless applications. An increase in bandwidth could be achieved together with a gain.…”

An X/Ku-Band Series Feed Center Fed Shared Aperture Array Antenna for AIR-Borne Synthetic Aperture Radar Applications

“…A single-layer antenna array is an element array in X and Ku bands. Compared to the SAAs in [5][6][7][8][9][10][11], [13], and [16][17][18][19][20][21][22], the suggested SAA has an FR of 1.426, better gains, and better band isolation. The dual-band prototype has a compact, multi-layer, planar SAA architect.…”

“…The study recommends integrating the filter into the array's feed network for higher-order mode suppression. A microstrip filter is built into the antenna to reduce lower-order modes that interfere with higher-order modes used for SAA are in [19][20][21][22]. The proposed SAA has a frequency ratio of 1:1.8:4.5 for S/C/Ku triple-band (TB) dualpolarization (DP).…”