Communications: radio wave antennas – Antennas – With radio cabinet
Patent
1992-04-27
1994-11-15
Hajec, Donald
Communications: radio wave antennas
Antennas
With radio cabinet
343833, 343830, H01Q 124, H01Q 904
Patent
active
053652460
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a transmitting and/or receiving arrangement for portable appliances, consisting of a shielding housing of metal, containing the radio-frequency section, and an antenna, the antenna consisting of two or more antenna resonators which are parasitically coupled to one another and are essentially identically oriented in the longitudinal direction, having in each case one free resonator end and in each case one end angled via a bending edge and conductively connected to the shielding housing.
In EP-A 177 362, a wide-band antenna for portable radio appliances is described. It consists of two angled resonators of different resonant frequency. The two resonators are fed by a common line via a branch of the type of an "inverted-F antenna". The antenna resonators act independently of one another and do not form a unit. This is why the efficiency is not particularly high. The distance between the parallel legs is constant.
In U.S. Pat. No. 4,584,585, an antenna with resonators of wire angles is described. One resonator is fed at the end and forms an "inverted-L antenna". The second resonator is parasitically coupled. Although this arrangement achieves a good efficiency, the antenna has a fixed impedance and cannot be easily matched. The shape of the active antenna resonator is relatively difficult to bend and, in addition, the baseplate also exhibits a step. The bandwidth is relatively narrow.
In GB-A 2 067 842, a microstrip antenna is described which is applied to an insulating ground. Here, too, the distance between the two antenna resonators is constant. The free ends of the resonators are opposite one another. The feedpoint is close to the free end of one resonator.
"Inverted-F antennas" are known from T. Taga and K. Tsunekawa, "Performance Analysis of a Built-in Planar Inverted F Antenna for 800 MHz Band Portable Radio Units," IEEE Trans., Selected Areas in Commun., vol. SAC-5, no.5, pp. 921-929, June (1987). Such antennas are matched by varying the position of the feedpoint.
SUMMARY OF THE INVENTION
The invention is based on the object of improving the transmitting and receiving power of the antenna whilst ensuring that it is simple to produce and easily matched and has a wide bandwidth.
The object of the present invention is achieved by a transmitting and/or receiving arrangement for portable appliances, consisting of a shielding housing of metal, containing the radio-frequency section, and an antenna, the antenna consisting of two or more antenna resonators which are parasitically coupled to one another and are essentially identically oriented in the longitudinal direction, having in each case one free resonator end and in each case one end angled via a bending edge and conductively connected to the shielding housing, the transmitter output and receiver input, respectively, being connected only to the feedpoint of a single antenna resonator, if necessary via a duplex filter, via a feedline through a coaxial feedthrough in the shielding housing, which feedpoint is located between the bending edge and the free resonator end of this single antenna resonator, and the clearance of the slot formed between two adjacent antenna resonators being much less in the area of the free resonator end than at the bending edge for varying the input impedance of the antenna.
The resonators of the antenna which are not fed are parasitically excited by the fed resonator as a result of which the bandwidth of the antenna is increased. Due to the angled shape and the widening of the ends, currents flow in all three spatial directions. High reactive currents form which require low impedance. This fills gaps in the directional pattern of the antenna. Due to the low requirement for space, the arrangement is very well suited for mobile radio applications. It can be easily manufactured and the entire radio-frequency, audio-frequency and digital electronics of a portable radio appliance can be accommodated in the shielding housing. At the same time, the metal housing is used as the eq
REFERENCES:
patent: 4516127 (1985-05-01), Siwiak
patent: 4584585 (1986-04-01), Marko et al.
patent: 4625212 (1986-11-01), Oda et al.
patent: 4641366 (1987-02-01), Yokoyama et al.
patent: 4800392 (1989-01-01), Garay et al.
patent: 4849765 (1989-07-01), Marko
patent: 4876552 (1989-10-01), Zakman
patent: 5144324 (1992-09-01), Chin et al.
"Performance Analysis of a Built-In Planar Inverted F Antenn for 800 MHz Band Portable Radio Units", by T. Taga et al., IEEE Journal on Selected Areas In Communications, vol. SAC-5, No. 5, Jun. 1987, pp. 921-929.
"Diversity Antennas For Portable Telephones", by K. Tsunekawa NTT Radio Communication Systems Laboratories, Japan (1989), no month pp. 50-56.
Bonek Ernst
Rasinger Josef
Scholtz Arpad-Luwdig
Hajec Donald
Le Hoang-anh
Siemens Aktiengesellschaft
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