New considerations in the design of low-cost probe-fed truncated corner microstrip antennas for GPS applications

Circularly-polarized microstrip antenna radiation efficiency simulation based on the wheeler cap method

“…its large input reactanceXin = i 33.73 Q -for optimal axial ratio preventing the proper antenna matching to a 50-Q SMA coaxial connector), the usual square patch is replaced with a rectangular one [2]. Keeping the same 6.6-mm FR4 thickness as before, a new design (Fig.…”

“…Low-cost circularly-polarized (CP) microstrip antennas have been the subject of recent investigation [1], [2] where "low-cost" refers to the cost ofthe antenna substrate. Use of lowcost substrates -such as the FR41aminate, for instance -introduces additional complexity into the antenna design, due to their high loss tangent and the inaccurate value of their relative permittivity.…”

Analysis and Design of Cavity-Backed Probe-Fed Hybrid Microstrip Antennas on FR4 Substrate

“…In order to achieve higher levels of radiation efficiency, microstrip antennas have been designed on expensive low-loss tangent (about 0.002) laminates [2][3][4]. On the other hand, now that both market and technology are ready for mass production, techniques for designing microstrip antennas on low-cost but electrically poorer FR4 substrate have been reported [5][6][7][8][9][10][11][12][13][14].…”

Microstrip-Fed Circularly Polarized Square-Ring Patch Antenna for GPS Applications

“…A typical technique for producing circular polarization wave involves the use of feeding structure to excite two orthogonal linearly polarized modes of equal amplitude and a 90 phase difference [1]- [11]. The well-known method for obtaining circular polarization using single-feed patch antenna involves slotting and truncating the corner of the square patch antenna [1]- [9]. Since the two near-degenerate orthogonal modes of equal amplitude and the 90 phase difference were excited, the purity of polarization will be relatively less.…”